Articles | Volume 16, issue 24
https://doi.org/10.5194/bg-16-4765-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-16-4765-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
16 Dec 2019
Research article |
| 16 Dec 2019
| 16 Dec 2019
Major role of ammonia-oxidizing bacteria in N2O production in the Pearl River estuary
Li Ma
State Key Laboratory of Marine Environmental Science, Xiamen
University, Xiamen 361101, China
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361101,
China
Hua Lin
State Key Laboratory of Marine Environmental Science, Xiamen
University, Xiamen 361101, China
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361101,
China
Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic
Administration, Second Institute of Oceanography, Ministry of Natural
Resources, Hangzhou 310012, China
Xiabing Xie
State Key Laboratory of Marine Environmental Science, Xiamen
University, Xiamen 361101, China
Minhan Dai
State Key Laboratory of Marine Environmental Science, Xiamen
University, Xiamen 361101, China
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361101,
China
Yao Zhang
CORRESPONDING AUTHOR
State Key Laboratory of Marine Environmental Science, Xiamen
University, Xiamen 361101, China
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361101,
China
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EGUsphere, https://doi.org/10.5194/egusphere-2024-3492, https://doi.org/10.5194/egusphere-2024-3492, 2024
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Coccolithophore calcite accounts for a major fraction of particulate inorganic carbon (PIC) standing stocks in the western North Pacific, with a markedly higher contribution in the oligotrophic subtropical gyre than in the Kuroshio-Oyashio transition region, which highlights the importance of coccolithophores for PIC production in the pelagic ocean. We also found extensive dissolution of coccolithophore calcite in the oversaturated shallow waters primarily driven by microbial metabolic activity.
Yanmin Wang, Xianghui Guo, Guizhi Wang, Lifang Wang, Tao Huang, Yan Li, Zhe Wang, and Minhan Dai
EGUsphere, https://doi.org/10.5194/egusphere-2023-3155, https://doi.org/10.5194/egusphere-2023-3155, 2024
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This study reports higher nutrient release in fish farming system compared to river inputs and other sources with implications for coastal environment. DIN and DIP variation in Sansha Bay are dominated by mariculture activity relative to river input during spring. The N/P budget shows that 52.8 ± 4.7 % of DIN and 33.0 ± 3.7 % of DIP released from fish feeds exceeded other nutrient inputs. Co-culture strategies (e.g., of fish, kelp and oysters) allow effective mitigation of environmental impacts.
Weiyi Tang, Bess B. Ward, Michael Beman, Laura Bristow, Darren Clark, Sarah Fawcett, Claudia Frey, François Fripiat, Gerhard J. Herndl, Mhlangabezi Mdutyana, Fabien Paulot, Xuefeng Peng, Alyson E. Santoro, Takuhei Shiozaki, Eva Sintes, Charles Stock, Xin Sun, Xianhui S. Wan, Min N. Xu, and Yao Zhang
Earth Syst. Sci. Data, 15, 5039–5077, https://doi.org/10.5194/essd-15-5039-2023, https://doi.org/10.5194/essd-15-5039-2023, 2023
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Nitrification and nitrifiers play an important role in marine nitrogen and carbon cycles by converting ammonium to nitrite and nitrate. Nitrification could affect microbial community structure, marine productivity, and the production of nitrous oxide – a powerful greenhouse gas. We introduce the newly constructed database of nitrification and nitrifiers in the marine water column and guide future research efforts in field observations and model development of nitrification.
Zhibo Shao, Yangchun Xu, Hua Wang, Weicheng Luo, Lice Wang, Yuhong Huang, Nona Sheila R. Agawin, Ayaz Ahmed, Mar Benavides, Mikkel Bentzon-Tilia, Ilana Berman-Frank, Hugo Berthelot, Isabelle C. Biegala, Mariana B. Bif, Antonio Bode, Sophie Bonnet, Deborah A. Bronk, Mark V. Brown, Lisa Campbell, Douglas G. Capone, Edward J. Carpenter, Nicolas Cassar, Bonnie X. Chang, Dreux Chappell, Yuh-ling Lee Chen, Matthew J. Church, Francisco M. Cornejo-Castillo, Amália Maria Sacilotto Detoni, Scott C. Doney, Cecile Dupouy, Marta Estrada, Camila Fernandez, Bieito Fernández-Castro, Debany Fonseca-Batista, Rachel A. Foster, Ken Furuya, Nicole Garcia, Kanji Goto, Jesús Gago, Mary R. Gradoville, M. Robert Hamersley, Britt A. Henke, Cora Hörstmann, Amal Jayakumar, Zhibing Jiang, Shuh-Ji Kao, David M. Karl, Leila R. Kittu, Angela N. Knapp, Sanjeev Kumar, Julie LaRoche, Hongbin Liu, Jiaxing Liu, Caroline Lory, Carolin R. Löscher, Emilio Marañón, Lauren F. Messer, Matthew M. Mills, Wiebke Mohr, Pia H. Moisander, Claire Mahaffey, Robert Moore, Beatriz Mouriño-Carballido, Margaret R. Mulholland, Shin-ichiro Nakaoka, Joseph A. Needoba, Eric J. Raes, Eyal Rahav, Teodoro Ramírez-Cárdenas, Christian Furbo Reeder, Lasse Riemann, Virginie Riou, Julie C. Robidart, Vedula V. S. S. Sarma, Takuya Sato, Himanshu Saxena, Corday Selden, Justin R. Seymour, Dalin Shi, Takuhei Shiozaki, Arvind Singh, Rachel E. Sipler, Jun Sun, Koji Suzuki, Kazutaka Takahashi, Yehui Tan, Weiyi Tang, Jean-Éric Tremblay, Kendra Turk-Kubo, Zuozhu Wen, Angelicque E. White, Samuel T. Wilson, Takashi Yoshida, Jonathan P. Zehr, Run Zhang, Yao Zhang, and Ya-Wei Luo
Earth Syst. Sci. Data, 15, 3673–3709, https://doi.org/10.5194/essd-15-3673-2023, https://doi.org/10.5194/essd-15-3673-2023, 2023
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N2 fixation by marine diazotrophs is an important bioavailable N source to the global ocean. This updated global oceanic diazotroph database increases the number of in situ measurements of N2 fixation rates, diazotrophic cell abundances, and nifH gene copy abundances by 184 %, 86 %, and 809 %, respectively. Using the updated database, the global marine N2 fixation rate is estimated at 223 ± 30 Tg N yr−1, which triplicates that using the original database.
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Biogeosciences, 20, 2013–2030, https://doi.org/10.5194/bg-20-2013-2023, https://doi.org/10.5194/bg-20-2013-2023, 2023
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We distinguished particulate organic carbon (POC) export fluxes out of the nutrient-depleted layer (NDL) and the euphotic zone. The amount of POC export flux at the NDL base suggests that the NDL could be a hotspot of particle export. The substantial POC export flux at the NDL base challenges traditional concepts that the NDL was limited in terms of POC export. The dominant nutrient source for POC export fluxes should be subsurface nutrients, which was determined by 15N isotopic mass balance.
Zhixuan Wang, Guizhi Wang, Xianghui Guo, Yan Bai, Yi Xu, and Minhan Dai
Earth Syst. Sci. Data, 15, 1711–1731, https://doi.org/10.5194/essd-15-1711-2023, https://doi.org/10.5194/essd-15-1711-2023, 2023
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We reconstructed monthly sea surface pCO2 data with a high spatial resolution in the South China Sea (SCS) from 2003 to 2020. We validate our reconstruction with three independent testing datasets and present a new method to assess the uncertainty of the data. The results strongly suggest that our reconstruction effectively captures the main features of the spatiotemporal patterns of pCO2 in the SCS. Using this dataset, we found that the SCS is overall a weak source of atmospheric CO2.
Emily J. Zakem, Barbara Bayer, Wei Qin, Alyson E. Santoro, Yao Zhang, and Naomi M. Levine
Biogeosciences, 19, 5401–5418, https://doi.org/10.5194/bg-19-5401-2022, https://doi.org/10.5194/bg-19-5401-2022, 2022
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We use a microbial ecosystem model to quantitatively explain the mechanisms controlling observed relative abundances and nitrification rates of ammonia- and nitrite-oxidizing microorganisms in the ocean. We also estimate how much global carbon fixation can be associated with chemoautotrophic nitrification. Our results improve our understanding of the controls on nitrification, laying the groundwork for more accurate predictions in global climate models.
Xiaofeng Dai, Mingming Chen, Xianhui Wan, Ehui Tan, Jialing Zeng, Nengwang Chen, Shuh-Ji Kao, and Yao Zhang
Biogeosciences, 19, 3757–3773, https://doi.org/10.5194/bg-19-3757-2022, https://doi.org/10.5194/bg-19-3757-2022, 2022
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This study revealed the distinct distribution patterns of six key microbial functional genes and transcripts related to N2O sources and sinks in four estuaries spanning the Chinese coastline, which were significantly constrained by nitrogen and oxygen concentrations, salinity, temperature, and pH. The community structure of the nosZ clade II was distinctly different from those in the soil and marine OMZs. Denitrification may principally control the N2O emissions patterns across the estuaries.
Yangyang Zhao, Khanittha Uthaipan, Zhongming Lu, Yan Li, Jing Liu, Hongbin Liu, Jianping Gan, Feifei Meng, and Minhan Dai
Biogeosciences, 18, 2755–2775, https://doi.org/10.5194/bg-18-2755-2021, https://doi.org/10.5194/bg-18-2755-2021, 2021
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In situ oxygen consumption rates were estimated for the first time during destruction of coastal hypoxia as disturbed by a typhoon and its reinstatement in the South China Sea off the Pearl River estuary. The reinstatement of summer hypoxia was rapid with a comparable timescale with that of its initial disturbance from frequent tropical cyclones, which has important implications for better understanding the intermittent nature of coastal hypoxia and its prediction in a changing climate.
Guizhi Wang, Samuel S. P. Shen, Yao Chen, Yan Bai, Huan Qin, Zhixuan Wang, Baoshan Chen, Xianghui Guo, and Minhan Dai
Earth Syst. Sci. Data, 13, 1403–1417, https://doi.org/10.5194/essd-13-1403-2021, https://doi.org/10.5194/essd-13-1403-2021, 2021
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Yanhong Lu, Shunyan Cheung, Ling Chen, Shuh-Ji Kao, Xiaomin Xia, Jianping Gan, Minhan Dai, and Hongbin Liu
Biogeosciences, 17, 6017–6032, https://doi.org/10.5194/bg-17-6017-2020, https://doi.org/10.5194/bg-17-6017-2020, 2020
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Through a comprehensive investigation, we observed differential niche partitioning among diverse ammonia-oxidizing archaea (AOA) sublineages in a typical subtropical estuary. Distinct AOA communities observed at DNA and RNA levels suggested that a strong divergence in ammonia-oxidizing activity among different AOA groups occurs. Our result highlights the importance of identifying major ammonia oxidizers at RNA level in future studies.
Lei Hou, Xiabing Xie, Xianhui Wan, Shuh-Ji Kao, Nianzhi Jiao, and Yao Zhang
Biogeosciences, 15, 5169–5187, https://doi.org/10.5194/bg-15-5169-2018, https://doi.org/10.5194/bg-15-5169-2018, 2018
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The niche differentiation of ammonia and nitrite oxidizers is controversial because they display disparate patterns in different environments. Combining molecular and nitrification rate analyses, our study clarified that water mass mixing and the substrate availability primarily regulated the niche differentiation of nitrifier populations along a salinity gradient. The nitrifier populations may have specific adaptations to different substrate conditions through their ecological strategies.
Guizhi Wang, Shuling Wang, Zhangyong Wang, Wenping Jing, Yi Xu, Zhouling Zhang, Ehui Tan, and Minhan Dai
Biogeosciences, 15, 997–1009, https://doi.org/10.5194/bg-15-997-2018, https://doi.org/10.5194/bg-15-997-2018, 2018
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Time-series observations of nutrients and 228Ra, a groundwater discharge tracer, were carried out from spring to neap tide in the Luhuitou fringing reef at Sanya Bay in the South China Sea. Nitrate, phosphate, and silicate in the water column showed greater diurnal variation during the spring tide. Biological processes predominantly controlled the composition of nutrients, but there was less of an impact in the spring tide due to groundwater discharge in this reef system.
Xin Lin, Ruiping Huang, Yan Li, Futian Li, Yaping Wu, David A. Hutchins, Minhan Dai, and Kunshan Gao
Biogeosciences, 15, 551–565, https://doi.org/10.5194/bg-15-551-2018, https://doi.org/10.5194/bg-15-551-2018, 2018
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We examine the effects of elevated CO2 on bacterioplankton community during a mesocosm experiment in subtropical, eutrophic coastal waters in southern China. We found that the elevated CO2 hardly altered the network structure of the bacterioplankton taxa present with high abundance but appeared to reassemble the community network of taxa with low abundance. Results suggest that the bacterioplankton community in this subtropical, high-nutrient coastal environment is insensitive to elevated CO2.
Yangyang Lu, Zuozhu Wen, Dalin Shi, Mingming Chen, Yao Zhang, Sophie Bonnet, Yuhang Li, Jiwei Tian, and Shuh-Ji Kao
Biogeosciences, 15, 1–12, https://doi.org/10.5194/bg-15-1-2018, https://doi.org/10.5194/bg-15-1-2018, 2018
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We investigated the light response of field Trichodesmium N2 fixation and net dissolved nitrogen release behavior. Our results suggest that N2 fixation was a function of light intensity, and the light requirement of Trichodesmium nitrogen fixation was high relative to its photosynthetic light demand. Meanwhile, light is a crucial parameter driving the physiological state of Trichodesmium, which subsequently determined the C / N metabolism and net dissolved nitrogen release.
Jianzhong Su, Minhan Dai, Biyan He, Lifang Wang, Jianping Gan, Xianghui Guo, Huade Zhao, and Fengling Yu
Biogeosciences, 14, 4085–4099, https://doi.org/10.5194/bg-14-4085-2017, https://doi.org/10.5194/bg-14-4085-2017, 2017
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We provide direct and quantitative assessments showing the marine organic matter from eutrophication-induced primary production dominated oxygen consumption in the hypoxic zone, while the terrestrially sourced organic matter also significantly contributed to the formation and maintenance of hypoxia in the lower Pearl River Estuary (PRE) and the adjacent coastal water.
Xiaobo Jin, Chuanlian Liu, Alex J. Poulton, Minhan Dai, and Xianghui Guo
Biogeosciences, 13, 4843–4861, https://doi.org/10.5194/bg-13-4843-2016, https://doi.org/10.5194/bg-13-4843-2016, 2016
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The vertical structure of the coccolithophore community in the water column was controlled by trophic conditions, which were regulated by mesoscale eddies across the South China Sea basin. Three key species (Emiliania huxleyi, Gephyrocapsa oceanica, Florisphaera profunda) contributed roughly half of the surface ocean coccolith-calcite concentrations. E. huxleyi coccolith length is influenced by light and nutrients through the regulation of growth rates.
Shuh-Ji Kao, Tzu-Ling Chiang, Da-Wei Li, Yi-Chia Hsin, Li-Wei Zheng, Jin-Yu Terence Yang, Shih-Chieh Hsu, Chau-Ron Wu, and Minhan Dai
Clim. Past Discuss., https://doi.org/10.5194/cp-2015-167, https://doi.org/10.5194/cp-2015-167, 2016
Preprint withdrawn
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A 3-D model was run for the South China Sea to explore the effects of sea level drop and monsoon wind intensity on glacial patterns of circulation and ventilation. Winter northeasterly monsoon wind intensity governs the volume transport of Kuroshio intrusion through the Luzon Strait, subsequently, the water exchange rate and the mean residence time of water body of the SCS.
X.-H. Guo, W.-D. Zhai, M.-H. Dai, C. Zhang, Y. Bai, Y. Xu, Q. Li, and G.-Z. Wang
Biogeosciences, 12, 5495–5514, https://doi.org/10.5194/bg-12-5495-2015, https://doi.org/10.5194/bg-12-5495-2015, 2015
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We report the most comprehensive data set of surface seawater pCO2 and air-sea CO2 fluxes in the East China Sea (ECS) based on 24 surveys conducted in 2006-2011. We categorized the ECS into five different domains characterized by different physics and biogeochemistry to better characterize the seasonality of the pCO2 dynamics and to better constrain the CO2 flux. The annual average CO2 influx into the entire ECS shelf was 6.9+/-4.0 mmol m-2 d-1, about twice the global average in an ocean margin.
Z. Cao, M. Dai, W. Evans, J. Gan, and R. Feely
Biogeosciences, 11, 6341–6354, https://doi.org/10.5194/bg-11-6341-2014, https://doi.org/10.5194/bg-11-6341-2014, 2014
N. Jiao, Y. Zhang, K. Zhou, Q. Li, M. Dai, J. Liu, J. Guo, and B. Huang
Biogeosciences, 11, 2465–2475, https://doi.org/10.5194/bg-11-2465-2014, https://doi.org/10.5194/bg-11-2465-2014, 2014
Y. Zhang, X. Xie, N. Jiao, S. S.-Y. Hsiao, and S.-J. Kao
Biogeosciences, 11, 2131–2145, https://doi.org/10.5194/bg-11-2131-2014, https://doi.org/10.5194/bg-11-2131-2014, 2014
S. S.-Y. Hsiao, T.-C. Hsu, J.-w. Liu, X. Xie, Y. Zhang, J. Lin, H. Wang, J.-Y. T. Yang, S.-C. Hsu, M. Dai, and S.-J. Kao
Biogeosciences, 11, 2083–2098, https://doi.org/10.5194/bg-11-2083-2014, https://doi.org/10.5194/bg-11-2083-2014, 2014
J.-Y. T. Yang, S.-C. Hsu, M. H. Dai, S. S.-Y. Hsiao, and S.-J. Kao
Biogeosciences, 11, 1833–1846, https://doi.org/10.5194/bg-11-1833-2014, https://doi.org/10.5194/bg-11-1833-2014, 2014
S.-J. Kao, R. G. Hilton, K. Selvaraj, M. Dai, F. Zehetner, J.-C. Huang, S.-C. Hsu, R. Sparkes, J. T. Liu, T.-Y. Lee, J.-Y. T. Yang, A. Galy, X. Xu, and N. Hovius
Earth Surf. Dynam., 2, 127–139, https://doi.org/10.5194/esurf-2-127-2014, https://doi.org/10.5194/esurf-2-127-2014, 2014
Y.-F. Tseng, J. Lin, M. Dai, and S.-J. Kao
Biogeosciences, 11, 409–423, https://doi.org/10.5194/bg-11-409-2014, https://doi.org/10.5194/bg-11-409-2014, 2014
A. Q. Han, M. H. Dai, J. P. Gan, S.-J. Kao, X. Z. Zhao, S. Jan, Q. Li, H. Lin, C.-T. A. Chen, L. Wang, J. Y. Hu, L. F. Wang, and F. Gong
Biogeosciences, 10, 8159–8170, https://doi.org/10.5194/bg-10-8159-2013, https://doi.org/10.5194/bg-10-8159-2013, 2013
W.-D. Zhai, M.-H. Dai, B.-S. Chen, X.-H. Guo, Q. Li, S.-L. Shang, C.-Y. Zhang, W.-J. Cai, and D.-X. Wang
Biogeosciences, 10, 7775–7791, https://doi.org/10.5194/bg-10-7775-2013, https://doi.org/10.5194/bg-10-7775-2013, 2013
K.-K. Liu, L.-W. Wang, M. Dai, C.-M. Tseng, Y. Yang, C.-H. Sui, L. Oey, K.-Y. Tseng, and S.-M. Huang
Biogeosciences, 10, 7449–7462, https://doi.org/10.5194/bg-10-7449-2013, https://doi.org/10.5194/bg-10-7449-2013, 2013
C. Du, Z. Liu, M. Dai, S.-J. Kao, Z. Cao, Y. Zhang, T. Huang, L. Wang, and Y. Li
Biogeosciences, 10, 6419–6432, https://doi.org/10.5194/bg-10-6419-2013, https://doi.org/10.5194/bg-10-6419-2013, 2013
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Biogeosciences, 21, 4637–4663, https://doi.org/10.5194/bg-21-4637-2024, https://doi.org/10.5194/bg-21-4637-2024, 2024
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In this work, we measured the chemistry of seawater from samples obtained from different depths and locations off the east coast of the Northeast Greenland National Park to determine what is influencing concentrations of dissolved CO2. Historically, the region has always been thought to take up CO2 from the atmosphere, but we show that it is possible for the region to become a source in late summer. We discuss the variables that may be related to such changes.
Lennart Thomas Bach, Aaron James Ferderer, Julie LaRoche, and Kai Georg Schulz
Biogeosciences, 21, 3665–3676, https://doi.org/10.5194/bg-21-3665-2024, https://doi.org/10.5194/bg-21-3665-2024, 2024
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Ocean alkalinity enhancement (OAE) is an emerging marine CO2 removal method, but its environmental effects are insufficiently understood. The OAE Pelagic Impact Intercomparison Project (OAEPIIP) provides funding for a standardized and globally replicated microcosm experiment to study the effects of OAE on plankton communities. Here, we provide a detailed manual for the OAEPIIP experiment. We expect OAEPIIP to help build scientific consensus on the effects of OAE on plankton.
Marlena Szeligowska, Déborah Benkort, Anna Przyborska, Mateusz Moskalik, Bernabé Moreno, Emilia Trudnowska, and Katarzyna Błachowiak-Samołyk
Biogeosciences, 21, 3617–3639, https://doi.org/10.5194/bg-21-3617-2024, https://doi.org/10.5194/bg-21-3617-2024, 2024
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The European Arctic is experiencing rapid regional warming, causing glaciers that terminate in the sea to retreat onto land. Due to this process, the area of a well-studied fjord, Hornsund, has increased by around 100 km2 (40%) since 1976. Combining satellite and in situ data with a mathematical model, we estimated that, despite some negative consequences of glacial meltwater release, such emerging coastal waters could mitigate climate change by increasing carbon uptake and storage by sediments.
Mallory C. Ringham, Nathan Hirtle, Cody Shaw, Xi Lu, Julian Herndon, Brendan R. Carter, and Matthew D. Eisaman
Biogeosciences, 21, 3551–3570, https://doi.org/10.5194/bg-21-3551-2024, https://doi.org/10.5194/bg-21-3551-2024, 2024
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Ocean alkalinity enhancement leverages the large surface area and carbon storage capacity of the oceans to store atmospheric CO2 as dissolved bicarbonate. We monitored CO2 uptake in seawater treated with NaOH to establish operational boundaries for carbon removal experiments. Results show that CO2 equilibration occurred on the order of weeks to months, was consistent with values expected from equilibration calculations, and was limited by mineral precipitation at high pH and CaCO3 saturation.
Riss M. Kell, Rebecca J. Chmiel, Deepa Rao, Dawn M. Moran, Matthew R. McIlvin, Tristan J. Horner, Nicole L. Schanke, Robert B. Dunbar, Giacomo R. DiTullio, and Mak A. Saito
EGUsphere, https://doi.org/10.5194/egusphere-2024-2085, https://doi.org/10.5194/egusphere-2024-2085, 2024
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Southern Ocean phytoplankton play a pivotal role in regulating the uptake and sequestration of carbon dioxide from the atmosphere. This study describes a new stable zinc isotope uptake rate measurement method used to quantify zinc and cadmium uptake rates within native Southern Ocean phytoplankton communities. This data can better inform biogeochemical model predictions of primary production, carbon export, and atmospheric carbon dioxide flux.
Riel Carlo O. Ingeniero, Gesa Schulz, and Hermann W. Bange
Biogeosciences, 21, 3425–3440, https://doi.org/10.5194/bg-21-3425-2024, https://doi.org/10.5194/bg-21-3425-2024, 2024
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Our research is the first to measure dissolved NO concentrations in temperate estuarine waters, providing insights into its distribution under varying conditions and enhancing our understanding of its production processes. Dissolved NO was supersaturated in the Elbe Estuary, indicating that it is a source of atmospheric NO. The observed distribution of dissolved NO most likely resulted from nitrification.
Weiyi Tang, Jeff Talbott, Timothy Jones, and Bess B. Ward
Biogeosciences, 21, 3239–3250, https://doi.org/10.5194/bg-21-3239-2024, https://doi.org/10.5194/bg-21-3239-2024, 2024
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Wastewater treatment plants (WWTPs) are known to be hotspots of greenhouse gas emissions. However, the impact of WWTPs on the emission of the greenhouse gas N2O in downstream aquatic environments is less constrained. We found spatially and temporally variable but overall higher N2O concentrations and fluxes in waters downstream of WWTPs, pointing to the need for efficient N2O removal in addition to the treatment of nitrogen in WWTPs.
Laura Marin-Samper, Javier Arístegui, Nauzet Hernández-Hernández, and Ulf Riebesell
EGUsphere, https://doi.org/10.5194/egusphere-2024-1776, https://doi.org/10.5194/egusphere-2024-1776, 2024
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This study exposed a natural community to two non-CO2 equilibrated ocean alkalinity enhancement (OAE) deployments using different minerals. Adding alkalinity in this manner decreases dissolved CO2, essential for photosynthesis. While photosynthesis was not suppressed, bloom formation was delayed, potentially impacting marine food webs. The study emphasizes the need for further research on OAE without prior equilibration and its ecological implications
Amanda Y. L. Cheong, Kogila Vani Annammala, Ee Ling Yong, Yongli Zhou, Robert S. Nichols, and Patrick Martin
Biogeosciences, 21, 2955–2971, https://doi.org/10.5194/bg-21-2955-2024, https://doi.org/10.5194/bg-21-2955-2024, 2024
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We measured nutrients and dissolved organic matter for 1 year in a eutrophic tropical estuary to understand their sources and cycling. Our data show that the dissolved organic matter originates partly from land and partly from microbial processes in the water. Internal recycling is likely important for maintaining high nutrient concentrations, and we found that there is often excess nitrogen compared to silicon and phosphorus. Our data help to explain how eutrophication persists in this system.
Aaron Ferderer, Kai G. Schulz, Ulf Riebesell, Kirralee G. Baker, Zanna Chase, and Lennart T. Bach
Biogeosciences, 21, 2777–2794, https://doi.org/10.5194/bg-21-2777-2024, https://doi.org/10.5194/bg-21-2777-2024, 2024
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Ocean alkalinity enhancement (OAE) is a promising method of atmospheric carbon removal; however, its ecological impacts remain largely unknown. We assessed the effects of simulated silicate- and calcium-based mineral OAE on diatom silicification. We found that increased silicate concentrations from silicate-based OAE increased diatom silicification. In contrast, the enhancement of alkalinity had no effect on community silicification and minimal effects on the silicification of different genera.
David González-Santana, María Segovia, Melchor González-Dávila, Librada Ramírez, Aridane G. González, Leonardo J. Pozzo-Pirotta, Veronica Arnone, Victor Vázquez, Ulf Riebesell, and J. Magdalena Santana-Casiano
Biogeosciences, 21, 2705–2715, https://doi.org/10.5194/bg-21-2705-2024, https://doi.org/10.5194/bg-21-2705-2024, 2024
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In a recent experiment off the coast of Gran Canaria (Spain), scientists explored a method called ocean alkalinization enhancement (OAE), where carbonate minerals were added to seawater. This process changed the levels of certain ions in the water, affecting its pH and buffering capacity. The researchers were particularly interested in how this could impact the levels of essential trace metals in the water.
Lucas Porz, Wenyan Zhang, Nils Christiansen, Jan Kossack, Ute Daewel, and Corinna Schrum
Biogeosciences, 21, 2547–2570, https://doi.org/10.5194/bg-21-2547-2024, https://doi.org/10.5194/bg-21-2547-2024, 2024
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Seafloor sediments store a large amount of carbon, helping to naturally regulate Earth's climate. If disturbed, some sediment particles can turn into CO2, but this effect is not well understood. Using computer simulations, we found that bottom-contacting fishing gears release about 1 million tons of CO2 per year in the North Sea, one of the most heavily fished regions globally. We show how protecting certain areas could reduce these emissions while also benefitting seafloor-living animals.
Jiaying A. Guo, Robert F. Strzepek, Kerrie M. Swadling, Ashley T. Townsend, and Lennart T. Bach
Biogeosciences, 21, 2335–2354, https://doi.org/10.5194/bg-21-2335-2024, https://doi.org/10.5194/bg-21-2335-2024, 2024
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Ocean alkalinity enhancement aims to increase atmospheric CO2 sequestration by adding alkaline materials to the ocean. We assessed the environmental effects of olivine and steel slag powder on coastal plankton. Overall, slag is more efficient than olivine in releasing total alkalinity and, thus, in its ability to sequester CO2. Slag also had less environmental effect on the enclosed plankton communities when considering its higher CO2 removal potential based on this 3-week experiment.
Giovanni Galli, Sarah Wakelin, James Harle, Jason Holt, and Yuri Artioli
Biogeosciences, 21, 2143–2158, https://doi.org/10.5194/bg-21-2143-2024, https://doi.org/10.5194/bg-21-2143-2024, 2024
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This work shows that, under a high-emission scenario, oxygen concentration in deep water of parts of the North Sea and Celtic Sea can become critically low (hypoxia) towards the end of this century. The extent and frequency of hypoxia depends on the intensity of climate change projected by different climate models. This is the result of a complex combination of factors like warming, increase in stratification, changes in the currents and changes in biological processes.
Sandy E. Tenorio and Laura Farías
Biogeosciences, 21, 2029–2050, https://doi.org/10.5194/bg-21-2029-2024, https://doi.org/10.5194/bg-21-2029-2024, 2024
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Time series studies show that CH4 is highly dynamic on the coastal ocean surface and planktonic communities are linked to CH4 accumulation, as found in coastal upwelling off Chile. We have identified the crucial role of picoplankton (> 3 µm) in CH4 recycling, especially with the addition of methylated substrates (trimethylamine and methylphosphonic acid) during upwelling and non-upwelling periods. These insights improve understanding of surface ocean CH4 recycling, aiding CH4 emission estimates.
Charlotte A. J. Williams, Tom Hull, Jan Kaiser, Claire Mahaffey, Naomi Greenwood, Matthew Toberman, and Matthew R. Palmer
Biogeosciences, 21, 1961–1971, https://doi.org/10.5194/bg-21-1961-2024, https://doi.org/10.5194/bg-21-1961-2024, 2024
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Oxygen (O2) is a key indicator of ocean health. The risk of O2 loss in the productive coastal/continental slope regions is increasing. Autonomous underwater vehicles equipped with O2 optodes provide lots of data but have problems resolving strong vertical O2 changes. Here we show how to overcome this and calculate how much O2 is supplied to the low-O2 bottom waters via mixing. Bursts in mixing supply nearly all of the O2 to bottom waters in autumn, stopping them reaching ecologically low levels.
Sabine Schmidt and Ibrahima Iris Diallo
Biogeosciences, 21, 1785–1800, https://doi.org/10.5194/bg-21-1785-2024, https://doi.org/10.5194/bg-21-1785-2024, 2024
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Along the French coast facing the Bay of Biscay, the large Gironde and Loire estuaries suffer from hypoxia. This prompted a study of the small Charente estuary located between them. This work reveals a minimum oxygen zone in the Charente estuary, which extends for about 25 km. Temperature is the main factor controlling the hypoxia. This calls for the monitoring of small turbid macrotidal estuaries that are vulnerable to hypoxia, a risk expected to increase with global warming.
Jessica L. Oberlander, Mackenzie E. Burke, Cat A. London, and Hugh L. MacIntyre
EGUsphere, https://doi.org/10.5194/egusphere-2024-971, https://doi.org/10.5194/egusphere-2024-971, 2024
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OAE is a promising negative emission technology that could restore the oceanic pH and carbonate system to a pre-industrial state. To our knowledge, this paper is the first to assess the potential impact of OAE on phytoplankton through an analysis of prior studies and the effects of simulated OAE on photosynthetic competence. Our findings suggest that there may be little if any significant impact on most phytoplankton studied to date if OAE is conducted in well-flushed, near-shore environments.
Simone R. Alin, Jan A. Newton, Richard A. Feely, Samantha Siedlecki, and Dana Greeley
Biogeosciences, 21, 1639–1673, https://doi.org/10.5194/bg-21-1639-2024, https://doi.org/10.5194/bg-21-1639-2024, 2024
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We provide a new multi-stressor data product that allows us to characterize the seasonality of temperature, O2, and CO2 in the southern Salish Sea and delivers insights into the impacts of major marine heatwave and precipitation anomalies on regional ocean acidification and hypoxia. We also describe the present-day frequencies of temperature, O2, and ocean acidification conditions that cross thresholds of sensitive regional species that are economically or ecologically important.
Luisa Chiara Meiritz, Tim Rixen, Anja K. van der Plas, Tarron Lamont, and Niko Lahajnar
EGUsphere, https://doi.org/10.5194/egusphere-2024-700, https://doi.org/10.5194/egusphere-2024-700, 2024
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The transport of particles through the water column and their subsequent burial on the seafloor is an important process for carbon storage and the mediation of carbon dioxide in the oceans. Our results from the Benguela Upwelling System distinguish between the northern and southern parts of the study area and between passive (gravitational) and active (zooplankton) transport processes. The decomposition of organic matter is doubtlessly an important factor for the size of oxygen minimum zones.
Pamela Linford, Iván Pérez-Santos, Paulina Montero, Patricio A. Díaz, Claudia Aracena, Elías Pinilla, Facundo Barrera, Manuel Castillo, Aida Alvera-Azcárate, Mónica Alvarado, Gabriel Soto, Cécile Pujol, Camila Schwerter, Sara Arenas-Uribe, Pilar Navarro, Guido Mancilla-Gutiérrez, Robinson Altamirano, Javiera San Martín, and Camila Soto-Riquelme
Biogeosciences, 21, 1433–1459, https://doi.org/10.5194/bg-21-1433-2024, https://doi.org/10.5194/bg-21-1433-2024, 2024
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The Patagonian fjords comprise a world region where low-oxygen water and hypoxia conditions are observed. An in situ dataset was used to quantify the mechanism involved in the presence of these conditions in northern Patagonian fjords. Water mass analysis confirmed the contribution of Equatorial Subsurface Water in the advection of the low-oxygen water, and hypoxic conditions occurred when the community respiration rate exceeded the gross primary production.
Ting Wang, Buyun Du, Inke Forbrich, Jun Zhou, Joshua Polen, Elsie M. Sunderland, Prentiss H. Balcom, Celia Chen, and Daniel Obrist
Biogeosciences, 21, 1461–1476, https://doi.org/10.5194/bg-21-1461-2024, https://doi.org/10.5194/bg-21-1461-2024, 2024
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The strong seasonal increases of Hg in aboveground biomass during the growing season and the lack of changes observed after senescence in this salt marsh ecosystem suggest physiologically controlled Hg uptake pathways. The Hg sources found in marsh aboveground tissues originate from a mix of sources, unlike terrestrial ecosystems, where atmospheric GEM is the main source. Belowground plant tissues mostly take up Hg from soils. Overall, the salt marsh currently serves as a small net Hg sink.
Eleanor Simpson, Debby Ianson, Karen E. Kohfeld, Ana C. Franco, Paul A. Covert, Marty Davelaar, and Yves Perreault
Biogeosciences, 21, 1323–1353, https://doi.org/10.5194/bg-21-1323-2024, https://doi.org/10.5194/bg-21-1323-2024, 2024
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Shellfish aquaculture operates in nearshore areas where data on ocean acidification parameters are limited. We show daily and seasonal variability in pH and saturation states of calcium carbonate at nearshore aquaculture sites in British Columbia, Canada, and determine the contributing drivers of this variability. We find that nearshore locations have greater variability than open waters and that the uptake of carbon by phytoplankton is the major driver of pH and saturation state variability.
S. Alejandra Castillo Cieza, Rachel H. R. Stanley, Pierre Marrec, Diana N. Fontaine, E. Taylor Crockford, Dennis J. McGillicuddy Jr., Arshia Mehta, Susanne Menden-Deuer, Emily E. Peacock, Tatiana A. Rynearson, Zoe O. Sandwith, Weifeng Zhang, and Heidi M. Sosik
Biogeosciences, 21, 1235–1257, https://doi.org/10.5194/bg-21-1235-2024, https://doi.org/10.5194/bg-21-1235-2024, 2024
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The coastal ocean in the northeastern USA provides many services, including fisheries and habitats for threatened species. In summer 2019, a bloom occurred of a large unusual phytoplankton, the diatom Hemiaulus, with nitrogen-fixing symbionts. This led to vast changes in productivity and grazing rates in the ecosystem. This work shows that the emergence of one species can have profound effects on ecosystem function. Such changes may become more prevalent as the ocean warms due to climate change.
Claudine Hauri, Brita Irving, Sam Dupont, Rémi Pagés, Donna D. W. Hauser, and Seth L. Danielson
Biogeosciences, 21, 1135–1159, https://doi.org/10.5194/bg-21-1135-2024, https://doi.org/10.5194/bg-21-1135-2024, 2024
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Arctic marine ecosystems are highly susceptible to impacts of climate change and ocean acidification. We present pH and pCO2 time series (2016–2020) from the Chukchi Ecosystem Observatory and analyze the drivers of the current conditions to get a better understanding of how climate change and ocean acidification could affect the ecological niches of organisms.
William Hiles, Lucy C. Miller, Craig Smeaton, and William E. N. Austin
Biogeosciences, 21, 929–948, https://doi.org/10.5194/bg-21-929-2024, https://doi.org/10.5194/bg-21-929-2024, 2024
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Saltmarsh soils may help to limit the rate of climate change by storing carbon. To understand their impacts, they must be accurately mapped. We use drone data to estimate the size of three saltmarshes in NE Scotland. We find that drone imagery, combined with tidal data, can reliably inform our understanding of saltmarsh size. When compared with previous work using vegetation communities, we find that our most reliable new estimates of stored carbon are 15–20 % smaller than previously estimated.
De'Marcus Robinson, Anh L. D. Pham, David J. Yousavich, Felix Janssen, Frank Wenzhöfer, Eleanor C. Arrington, Kelsey M. Gosselin, Marco Sandoval-Belmar, Matthew Mar, David L. Valentine, Daniele Bianchi, and Tina Treude
Biogeosciences, 21, 773–788, https://doi.org/10.5194/bg-21-773-2024, https://doi.org/10.5194/bg-21-773-2024, 2024
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The present study suggests that high release of ferrous iron from the seafloor of the oxygen-deficient Santa Barabara Basin (California) supports surface primary productivity, creating positive feedback on seafloor iron release by enhancing low-oxygen conditions in the basin.
David J. Yousavich, De'Marcus Robinson, Xuefeng Peng, Sebastian J. E. Krause, Frank Wenzhöfer, Felix Janssen, Na Liu, Jonathan Tarn, Franklin Kinnaman, David L. Valentine, and Tina Treude
Biogeosciences, 21, 789–809, https://doi.org/10.5194/bg-21-789-2024, https://doi.org/10.5194/bg-21-789-2024, 2024
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Declining oxygen (O2) concentrations in coastal oceans can threaten people’s ways of life and food supplies. Here, we investigate how mats of bacteria that proliferate on the seafloor of the Santa Barbara Basin sustain and potentially worsen these O2 depletion events through their unique chemoautotrophic metabolism. Our study shows how changes in seafloor microbiology and geochemistry brought on by declining O2 concentrations can help these mats grow as well as how that growth affects the basin.
Krysten Rutherford, Katja Fennel, Lina Garcia Suarez, and Jasmin G. John
Biogeosciences, 21, 301–314, https://doi.org/10.5194/bg-21-301-2024, https://doi.org/10.5194/bg-21-301-2024, 2024
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We downscaled two mid-century (~2075) ocean model projections to a high-resolution regional ocean model of the northwest North Atlantic (NA) shelf. In one projection, the NA shelf break current practically disappears; in the other it remains almost unchanged. This leads to a wide range of possible future shelf properties. More accurate projections of coastal circulation features would narrow the range of possible outcomes of biogeochemical projections for shelf regions.
Lennart Thomas Bach
Biogeosciences, 21, 261–277, https://doi.org/10.5194/bg-21-261-2024, https://doi.org/10.5194/bg-21-261-2024, 2024
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Ocean alkalinity enhancement (OAE) is a widely considered marine carbon dioxide removal method. OAE aims to accelerate chemical rock weathering, which is a natural process that slowly sequesters atmospheric carbon dioxide. This study shows that the addition of anthropogenic alkalinity via OAE can reduce the natural release of alkalinity and, therefore, reduce the efficiency of OAE for climate mitigation. However, the additionality problem could be mitigated via a variety of activities.
Tsuneo Ono, Daisuke Muraoka, Masahiro Hayashi, Makiko Yorifuji, Akihiro Dazai, Shigeyuki Omoto, Takehiro Tanaka, Tomohiro Okamura, Goh Onitsuka, Kenji Sudo, Masahiko Fujii, Ryuji Hamanoue, and Masahide Wakita
Biogeosciences, 21, 177–199, https://doi.org/10.5194/bg-21-177-2024, https://doi.org/10.5194/bg-21-177-2024, 2024
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We carried out parallel year-round observations of pH and related parameters in five stations around the Japan coast. It was found that short-term acidified situations with Omega_ar less than 1.5 occurred at four of five stations. Most of such short-term acidified events were related to the short-term low salinity event, and the extent of short-term pH drawdown at high freshwater input was positively correlated with the nutrient concentration of the main rivers that flow into the coastal area.
K. Mareike Paul, Martijn Hermans, Sami A. Jokinen, Inda Brinkmann, Helena L. Filipsson, and Tom Jilbert
Biogeosciences, 20, 5003–5028, https://doi.org/10.5194/bg-20-5003-2023, https://doi.org/10.5194/bg-20-5003-2023, 2023
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Seawater naturally contains trace metals such as Mo and U, which accumulate under low oxygen conditions on the seafloor. Previous studies have used sediment Mo and U contents as an archive of changing oxygen concentrations in coastal waters. Here we show that in fjords the use of Mo and U for this purpose may be impaired by additional processes. Our findings have implications for the reliable use of Mo and U to reconstruct oxygen changes in fjords.
Hannah Sharpe, Michel Gosselin, Catherine Lalande, Alexandre Normandeau, Jean-Carlos Montero-Serrano, Khouloud Baccara, Daniel Bourgault, Owen Sherwood, and Audrey Limoges
Biogeosciences, 20, 4981–5001, https://doi.org/10.5194/bg-20-4981-2023, https://doi.org/10.5194/bg-20-4981-2023, 2023
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We studied the impact of submarine canyon processes within the Pointe-des-Monts system on biogenic matter export and phytoplankton assemblages. Using data from three oceanographic moorings, we show that the canyon experienced two low-amplitude sediment remobilization events in 2020–2021 that led to enhanced particle fluxes in the deep-water column layer > 2.6 km offshore. Sinking phytoplankton fluxes were lower near the canyon compared to background values from the lower St. Lawrence Estuary.
Dewi Langlet, Florian Mermillod-Blondin, Noémie Deldicq, Arthur Bauville, Gwendoline Duong, Lara Konecny, Mylène Hugoni, Lionel Denis, and Vincent M. P. Bouchet
Biogeosciences, 20, 4875–4891, https://doi.org/10.5194/bg-20-4875-2023, https://doi.org/10.5194/bg-20-4875-2023, 2023
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Benthic foraminifera are single-cell marine organisms which can move in the sediment column. They were previously reported to horizontally and vertically transport sediment particles, yet the impact of their motion on the dissolved fluxes remains unknown. Using microprofiling, we show here that foraminiferal burrow formation increases the oxygen penetration depth in the sediment, leading to a change in the structure of the prokaryotic community.
Masahiko Fujii, Ryuji Hamanoue, Lawrence Patrick Cases Bernardo, Tsuneo Ono, Akihiro Dazai, Shigeyuki Oomoto, Masahide Wakita, and Takehiro Tanaka
Biogeosciences, 20, 4527–4549, https://doi.org/10.5194/bg-20-4527-2023, https://doi.org/10.5194/bg-20-4527-2023, 2023
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This is the first study of the current and future impacts of climate change on Pacific oyster farming in Japan. Future coastal warming and acidification may affect oyster larvae as a result of longer exposure to lower-pH waters. A prolonged spawning period may harm oyster processing by shortening the shipping period and reducing oyster quality. To minimize impacts on Pacific oyster farming, in addition to mitigation measures, local adaptation measures may be required.
Taketoshi Kodama, Atsushi Nishimoto, Ken-ichi Nakamura, Misato Nakae, Naoki Iguchi, Yosuke Igeta, and Yoichi Kogure
Biogeosciences, 20, 3667–3682, https://doi.org/10.5194/bg-20-3667-2023, https://doi.org/10.5194/bg-20-3667-2023, 2023
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Carbon and nitrogen are essential elements for organisms; their stable isotope ratios (13C : 12C, 15N : 14N) are useful tools for understanding turnover and movement in the ocean. In the Sea of Japan, the environment is rapidly being altered by human activities. The 13C : 12C of small organic particles is increased by active carbon fixation, and phytoplankton growth increases the values. The 15N : 14N variations suggest that nitrates from many sources contribute to organic production.
Aubin Thibault de Chanvalon, George W. Luther, Emily R. Estes, Jennifer Necker, Bradley M. Tebo, Jianzhong Su, and Wei-Jun Cai
Biogeosciences, 20, 3053–3071, https://doi.org/10.5194/bg-20-3053-2023, https://doi.org/10.5194/bg-20-3053-2023, 2023
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The intensity of the oceanic trap of CO2 released by anthropogenic activities depends on the alkalinity brought by continental weathering. Between ocean and continent, coastal water and estuaries can limit or favour the alkalinity transfer. This study investigate new interactions between dissolved metals and alkalinity in the oxygen-depleted zone of estuaries.
Joonas J. Virtasalo, Peter Österholm, and Eero Asmala
Biogeosciences, 20, 2883–2901, https://doi.org/10.5194/bg-20-2883-2023, https://doi.org/10.5194/bg-20-2883-2023, 2023
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We mixed acidic metal-rich river water from acid sulfate soils and seawater in the laboratory to study the flocculation of dissolved metals and organic matter in estuaries. Al and Fe flocculated already at a salinity of 0–2 to large organic flocs (>80 µm size). Precipitation of Al and Fe hydroxide flocculi (median size 11 µm) began when pH exceeded ca. 5.5. Mn transferred weakly to Mn hydroxides and Co to the flocs. Up to 50 % of Cu was associated with the flocs, irrespective of seawater mixing.
Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell
Biogeosciences, 20, 2595–2612, https://doi.org/10.5194/bg-20-2595-2023, https://doi.org/10.5194/bg-20-2595-2023, 2023
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The sinking velocity of marine particles affects how much atmospheric CO2 is stored inside our oceans. We measured particle sinking velocities in the Peruvian upwelling system and assessed their physical and biochemical drivers. We found that sinking velocity was mainly influenced by particle size and porosity, while ballasting minerals played only a minor role. Our findings help us to better understand the particle sinking dynamics in this highly productive marine system.
Kyle E. Hinson, Marjorie A. M. Friedrichs, Raymond G. Najjar, Maria Herrmann, Zihao Bian, Gopal Bhatt, Pierre St-Laurent, Hanqin Tian, and Gary Shenk
Biogeosciences, 20, 1937–1961, https://doi.org/10.5194/bg-20-1937-2023, https://doi.org/10.5194/bg-20-1937-2023, 2023
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Climate impacts are essential for environmental managers to consider when implementing nutrient reduction plans designed to reduce hypoxia. This work highlights relative sources of uncertainty in modeling regional climate impacts on the Chesapeake Bay watershed and consequent declines in bay oxygen levels. The results demonstrate that planned water quality improvement goals are capable of reducing hypoxia levels by half, offsetting climate-driven impacts on terrestrial runoff.
Linquan Mu, Jaime B. Palter, and Hongjie Wang
Biogeosciences, 20, 1963–1977, https://doi.org/10.5194/bg-20-1963-2023, https://doi.org/10.5194/bg-20-1963-2023, 2023
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Enhancing ocean alkalinity accelerates carbon dioxide removal from the atmosphere. We hypothetically added alkalinity to the Amazon River and examined the increment of the carbon uptake by the Amazon plume. We also investigated the minimum alkalinity addition in which this perturbation at the river mouth could be detected above the natural variability.
Karl M. Attard, Anna Lyssenko, and Iván F. Rodil
Biogeosciences, 20, 1713–1724, https://doi.org/10.5194/bg-20-1713-2023, https://doi.org/10.5194/bg-20-1713-2023, 2023
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Aquatic plants produce a large amount of organic matter through photosynthesis that, following erosion, is deposited on the seafloor. In this study, we show that plant detritus can trigger low-oxygen conditions (hypoxia) in shallow coastal waters, making conditions challenging for most marine animals. We propose that the occurrence of hypoxia may be underestimated because measurements typically do not consider the region closest to the seafloor, where detritus accumulates.
M. James McLaughlin, Cindy Bessey, Gary A. Kendrick, John Keesing, and Ylva S. Olsen
Biogeosciences, 20, 1011–1026, https://doi.org/10.5194/bg-20-1011-2023, https://doi.org/10.5194/bg-20-1011-2023, 2023
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Coral reefs face increasing pressures from environmental change at present. The coral reef framework is produced by corals and calcifying algae. The Kimberley region of Western Australia has escaped land-based anthropogenic impacts. Specimens of the dominant coral and algae were collected from Browse Island's reef platform and incubated in mesocosms to measure calcification and production patterns of oxygen. This study provides important data on reef building and climate-driven effects.
Patricia Ayón Dejo, Elda Luz Pinedo Arteaga, Anna Schukat, Jan Taucher, Rainer Kiko, Helena Hauss, Sabrina Dorschner, Wilhelm Hagen, Mariona Segura-Noguera, and Silke Lischka
Biogeosciences, 20, 945–969, https://doi.org/10.5194/bg-20-945-2023, https://doi.org/10.5194/bg-20-945-2023, 2023
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Ocean upwelling regions are highly productive. With ocean warming, severe changes in upwelling frequency and/or intensity and expansion of accompanying oxygen minimum zones are projected. In a field experiment off Peru, we investigated how different upwelling intensities affect the pelagic food web and found failed reproduction of dominant zooplankton. The changes projected could severely impact the reproductive success of zooplankton communities and the pelagic food web in upwelling regions.
Mathilde Jutras, Alfonso Mucci, Gwenaëlle Chaillou, William A. Nesbitt, and Douglas W. R. Wallace
Biogeosciences, 20, 839–849, https://doi.org/10.5194/bg-20-839-2023, https://doi.org/10.5194/bg-20-839-2023, 2023
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The deep waters of the lower St Lawrence Estuary and gulf have, in the last decades, experienced a strong decline in their oxygen concentration. Below 65 µmol L-1, the waters are said to be hypoxic, with dire consequences for marine life. We show that the extent of the hypoxic zone shows a seven-fold increase in the last 20 years, reaching 9400 km2 in 2021. After a stable period at ~ 65 µmol L⁻¹ from 1984 to 2019, the oxygen level also suddenly decreased to ~ 35 µmol L-1 in 2020.
Sachi Umezawa, Manami Tozawa, Yuichi Nosaka, Daiki Nomura, Hiroji Onishi, Hiroto Abe, Tetsuya Takatsu, and Atsushi Ooki
Biogeosciences, 20, 421–438, https://doi.org/10.5194/bg-20-421-2023, https://doi.org/10.5194/bg-20-421-2023, 2023
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We conducted repetitive observations in Funka Bay, Japan, during the spring bloom 2019. We found nutrient concentration decreases in the dark subsurface layer during the bloom. Incubation experiments confirmed that diatoms could consume nutrients at a substantial rate, even in darkness. We concluded that the nutrient reduction was mainly caused by nutrient consumption by diatoms in the dark.
Dirk Jong, Lisa Bröder, Tommaso Tesi, Kirsi H. Keskitalo, Nikita Zimov, Anna Davydova, Philip Pika, Negar Haghipour, Timothy I. Eglinton, and Jorien E. Vonk
Biogeosciences, 20, 271–294, https://doi.org/10.5194/bg-20-271-2023, https://doi.org/10.5194/bg-20-271-2023, 2023
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With this study, we want to highlight the importance of studying both land and ocean together, and water and sediment together, as these systems function as a continuum, and determine how organic carbon derived from permafrost is broken down and its effect on global warming. Although on the one hand it appears that organic carbon is removed from sediments along the pathway of transport from river to ocean, it also appears to remain relatively ‘fresh’, despite this removal and its very old age.
Cited articles
Abell, G. C. J., Revill, A. T., Smith, C., Bissett, A. P., Volkman, J. K.,
and Robert, S. S.: Archaeal ammonia oxidizers and nirS-type denitrifiers
dominate sediment nitrifying and denitrifying populations in a subtropical
macrotidal estuary, ISME J., 4, 286–300, 2010.
Abril, G., Riou, S. A., Etcheber, H., Frankignoulle, M., de Wit, R.,
and Middelburg, J. J.: Transient tidal time-scale, nitrogen transformations in
an estuarine turbidity maximumfluid mud system (the Gironde, south-west
France), Estuar. Coast. Shelf S., 50, 703–715, 2000.
Allen, D., Dalal, R. C., Rennenberg, H., and Schmidt, S.: Seasonal variation
in nitrous oxide and methane emissions from subtropical estuary and coastal
mangrove sediments, Australia, Plant Biol., 13, 126–133, 2011.
Arévalo-Martínez, D. L., Kock, A., Löscher, C. R., Schmitz, R.
A., and Bange, H. W.: Massive nitrous oxide emissions from the tropical
South Pacific Ocean, Nat. Geosci., 8, 530–533, 2015.
Avrahami, S. and Bohanann, J. M.: N2O emission rates in a California
meadow soil are influenced by fertilizer level, soil moisture and the
community structure of ammonia-oxidizing bacteria, Glob. Change Biol., 15,
643–655, 2009.
Babbin, A. R., Bianchi, D., Jayakumar, A., and Ward, B. B.: Rapid nitrous
oxide cycling in the suboxic ocean, Science, 348, 1127–1129, 2015.
Barnes, J. and Upstill-Goddard, R. C.: N2O seasonal distributions and
air–sea exchange in UK estuaries: Implications for the tropospheric
N2O source from European coastal waters, J. Geophys. Res., 116, G01006, https://doi.org/10.1029/2009JG001156,
2011.
Bartossek, R., Nicol, G. W., Lanzen, A., Klenk, H. P., and Schleper, C.:
Homologues of nitrite reductases in ammonia-oxidizing archaea: diversity and
genomic context, Environ. Microbiol., 12, 1075–1088, 2010.
Bernhard, A. E., Landry, Z. C., Blevins, A., de la Torre, J. R., Giblin, A.
E., and Stahl, D. A.: Abundance of ammonia-oxidizing archaea and bacteria
along an estuarine salinity gradient in relation to potential nitrification
rates, Appl. Environ. Microbiol., 76, 1285–1289, 2010.
Braker, G., Fesefeldt, A., and Witzel, K. P.: Development of PCR primer
systems for amplification of nitrite reductase genes (nirK and nirS) to detect
denitrifying bacteria in environmental samples, Appl. Environ. Microbiol.,
64, 3769–3775, 1998.
Bricker, S. B., Longstaff, B., Dennison, W., Jones, A., Boicourt, K.,Wicks,
C., and Woerner, J.: Effects of nutrient enrichment in the nation's
estuaries: a decade of change, Harmful Algae, 8, 21–32, 2008.
Butterbach-Bahl, K., Baggs, E. M., Dannenmann, M., Kiese, R., and
Zechmeister-Boltenstern, S.: Nitrous oxide emissions from soils: how well do
we understand the processes and their controls?, Philos. T. Roy. Soc.
B, 368, https://doi.org/10.1098/rstb.2013.0122, 2013.
Canfield, D. E., Glazer, A. N., and Falkowski, P. G.: The Evolution and
Future of Earth's Nitrogen Cycle, Science, 330, 192–196, 2010.
Cao, Y., Sun, G., Han, Y., Sun, D., and Wang, X.: Determination of nitrogen,
carbon and oxygen stable isotope ratios in N2O, CH4, and CO2
at natural abundance levels by mass spectrometer, Acta Pedrol. Sin.,
45, 249–258, 2008 (in Chinese).
Clark, I. M., Buchkina, N., Jhureea, D., Goulding, K. W. T., and Hirsch, P.
R.: Impacts of nitrogen application rates on the activity and diversity of
denitrifying bacteria in the Broadbalk Wheat Experiment, Philos. T. Roy. Soc. B, 367, 1235–1244, https://doi.org/10.1098/rstb.2011.0314, 2012.
Coyne, M. S., Arunakumari, A., Averill, B. A., and Tiedje, J. M.:
Immunological identification and distribution of dissimilatory heme cd1 and
non-heme copper nitrite reductases in denitrifying bacteria, Appl. Environ.
Microbiol., 55, 2924–2931, 1989.
Čuhel, J., Šimek, M., Laughlin, R. J., Bru, D., Chèneby, D.,
Watson, C. J., and Philippot, L.: Insights into the Effect of Soil pH on
N2O and N2 Emissions and Denitrifier Community Size and Activity,
Appl. Environ. Microbiol., 76, 1870–1878, 2010.
Dai, M., Guo, X., Zhai, W., Yuan, L., Wang, B., Wang, L., Cai, P., Tang, T.,
and Cai, W. J.: Oxygen depletion in the upper reach of the Pearl River
estuary during a winter drought, Mar. Chem., 102, 159–169, 2006.
Dai, M., Wang, L., Guo, X., Zhai, W., Li, Q., He, B., and Kao, S.-J.: Nitrification and inorganic nitrogen distribution in a large perturbed river/estuarine system: the Pearl River Estuary, China, Biogeosciences, 5, 1227–1244, https://doi.org/10.5194/bg-5-1227-2008, 2008.
Dai, M., Gan, J., Han, A., Kung, H. S., and Yin, Z.: Physical dynamics and
biogeochemistry of the Pearl River plume, in: Biogeochemical dynamics at
major river-coastal interfaces, Linkages with Global Change, edited by: Bianchi, T. S.,
Allison, M. A., and Cai, W. J., Cambridge University Press,
321–351, 2014.
Daims, H., Lebedeva, E. V., Pjevac, P., Han, P., Herbold, C., Albertsen, M.,
Jehmlich, N., Palatinszky, M., Vierheilig, J., and Bulaev, A.: Complete
nitrification by Nitrospira bacteria, Nature, 528, 504–509, 2015.
Damashek, J. and Francis, C. A.: Microbial Nitrogen Cycling in Estuaries:
From Genes to Ecosystem Processes, Estuar. Coast., 41, 626–660,
2018.
Damashek, J., Casciotti, K. L., and Francis, C. A.: Variable Nitrification
Rates Across Environmental Gradients in Turbid, Nutrient-Rich Estuary Waters
of San Francisco Bay, Estuar. Coast., 39, 1050–1071, 2016.
De Wilde, H. P. J. and De Bie, M. J. M.: Nitrous oxide in the Schelde
Estuary: production by nitrification and emission to the atmosphere, Mar.
Chem., 69, 203–216, 2000.
De Bie, M. J. M., Middelburg, J .J., Starink, M., and Laanbroek, H. J.:
Factors controlling nitrous oxide at the microbial community and estuarine
scale, Mar. Ecol.-Prog. Ser., 240, 1–9, 2002.
Frame, C. H. and Casciotti, K. L.: Biogeochemical controls and isotopic signatures of nitrous oxide production by a marine ammonia-oxidizing bacterium, Biogeosciences, 7, 2695–2709, https://doi.org/10.5194/bg-7-2695-2010, 2010.
Frame, C. H., Lau, E., Joseph Nolan IV, E., Goepfert, T. J., and Lehmann, M.
F.: Acidification Enhances Hybrid N2O Production Associated with
Aquatic Ammonia-Oxidizing Microorganisms, Front. Microbiol., 7, 1–23, 2017.
Francis, C. A., Roberts, K. J., Beman, J. M., Santoro, A. E., and Oakley, B.
B.: Ubiquity and diversity of ammonia-oxidizing archaea in water columns and
sediments of the ocean, P. Natl. Acad. Sci. USA, 102, 14683–14688, 2005.
Freing, A., Wallace, D. W. R., and Bange, H. W.: Global oceanic production
of nitrous oxide, Philos. T. Roy. Soc. B, 367, 1245–1255,
https://doi.org/10.1098/rstb.2011.0360, 2012.
Füssel, J.: Impacts and importance of ammonia and nitrite oxidation in
the marine nitrogen cycle, PhD thesis, Max Planck Institute for Microbial
Ecology, Bremen, Germany, 166 pp., 2014.
Garnier, J., Cébron, A., Tallec, G., Billen, G., Sebilo, M., and
Martinez, A.: Nitrogen behaviour and nitrous oxide emission in the tidal
Seine River estuary (France) as influenced by human activities in the
upstream watershed, Biogeochemistry, 77, 305–326, 2006.
Goreau, T. J., Kaplan, W. A., Wofsy, S. C., McElroy, M. B., Valois, F. W.,
and Watson, S. W.: Production of
Graf, D. R. H., Jones, C. M., and Hallin,. S.: Intergenomic comparisons
highlight modularity of the denitrification pathway and underpin the
importance of community structure for N2O emissions, PloS One, 9,
e114118, https://doi.org/10.1371/journal.pone.0114118.s008,
2014.
Han, A., Dai, M., Kao, S.-J., Gan, J., Li, Q., Wang, L., Zhai, W., and Wang,
L.: Nutrient dynamics and biological consumption in a large continental
shelf system under the influence of both a river plume and coastal
upwelling, Limnol. Oceanogr., 57, 486–502, 2012.
Hatzenpichler, R.: Diversity, Physiology, and Niche Differentiation of
Ammonia Oxidizing Archaea, Appl. Environ. Microbol., 78, 7501–7510, 2012.
He, B., Dai, M., Zhai, W., Guo, X., and Wang, L.: Hypoxia in the upper
reaches of the Pearl River Estuary and its maintenance mechanisms: A
synthesis based on multiple year observations during 2000–2008, Mar. Chem.,
167, 13–24, 2014.
Hink, L., Nicol, G. W., and Prosser, J. I.: Archaea produce lower yields of
N2O than bacteria during aerobic ammonia oxidation in soil, Environ.
Microbiol., 19, 4829–4837, 2017.
Hink, L., Gubry-Rangin, C., Nicol, G. W., and Prosser, J. I.: The
consequences of niche and physiological differentiation of archaeal and
bacterial ammonia oxidisers for nitrous oxide emissions, ISME J.,
12, 1084–1093, 2018.
Hou, L., Xie, X., Wan, X., Kao, S.-J., Jiao, N., and Zhang, Y.: Niche differentiation of ammonia and nitrite oxidizers along a salinity gradient from the Pearl River estuary to the South China Sea, Biogeosciences, 15, 5169–5187, https://doi.org/10.5194/bg-15-5169-2018, 2018.
Huang, S., Chen, C., Yang, X., Wu, Q., and Zhang, R.: Distribution of typical denitrifying functional genes and diversity of the nirS-encoding bacterial community related to environmental characteristics of river sediments, Biogeosciences, 8, 3041–3051, https://doi.org/10.5194/bg-8-3041-2011, 2011.
Hu, A., Jiao, N., and Zhang, C. L.: Community structure and function of
planktonic Crenarchaeota: changes with depth in the South China Sea, Microb. Ecol., 62,
549–563, 2011.
Hu, H. W. and He, J. Z.: Comammox–a newly discovered nitrification process
in the terrestrial nitrogen cycle, J. Soils Sediments, 17, 2709–2717, 2017.
Huertas, I. E., Flecha, S., Navarro, G., Perez, F. F., and de la Paz, M.:
Spatio-temporal variability and controls on methane and nitrous oxide in the
Guadalquivir Estuary, Southwestern Europe, Aquat. Sci., 80, 29, 2018.
Ji, Q., Babbin, A. R., Jayakumar, A., Oleynik, S., and Ward, B. B.: Nitrous
oxide production by nitrication and denitrication in the Eastern Tropical
South Pacific oxygen minimum zone, Geophys. Res. Lett., 42, 10755–10764, 764,
2015.
Ji, Q., Buitenhuis, E., Suntharalingam, P., Sarmiento, J. L., and Ward, B.
B.: Global Nitrous Oxide Production Determined by Oxygen Sensitivity of
Nitrification and Denitrification, Global Biogeochem. Cy., 32, 1790–1802,
2018.
Jones, C. M., Spor, A., Brennan, F. P., Breuil, M. C., Bru,
D., Lemanceau, P., Griffiths, B., Hallin, S., and Philippot, L.: Recently
identified microbial guild mediates soil N2O sink capacity, Nat. Clim.
Change, 4, 801–805, 2014.
Jung, M. Y., Well, R., Min, D., Giesemann, A., Park, S. J., Kim, J. G., and
Rhee, S. K.: Isotopic signatures of N2O produced by ammonia-oxidizing
archaea from soils, ISME J., 8, 1115–1125, 2014.
Kester, R. A., de Boer, W., and Laanbroek, H. J.: Production of NO and N2O
by pure cultures of nitrifying and denitrifying bacteria during changes in
aeration, Appl. Environ. Microbiol., 63, 3872–3877, 1997.
Kim, O. S., Junier, P., Imhoff, J. F., and Witzel, K. P.: Comparative
analysis of ammonia monooxygenase (amoA) genes in the water column and
sediment–water interface of two lakes and the Baltic Sea, FEMS Microbiol.
Ecol., 66, 367–378, 2008.
Kim, I.-N., Lee, K., Bange, H. W., and Macdonald, A. M.: Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985–2007, Biogeosciences, 10, 6783–6792, https://doi.org/10.5194/bg-10-6783-2013, 2013.
Kits, K. D., Sedlacek, C. J., Lebedeva, E. V., Han, P., Bulaev, A., Pjevac,
P., Daebeler, A., Romano, S., Albertsen, M., Stein, L. Y., Daims, H., and
Wagner, M.: Kinetic analysis of a complete nitrifier reveals an oligotrophic
lifestyle, Nature, 549, 269–272, 2017.
Kits, K. D., Jung, M. Y., Vierheilig, J., Pjevac, P., Sedlacek, C. J., Liu,
S., Herbold, C., Stein, L. Y., Richter, A., Wisse, H., Brüggemann, N.,
Wagner, M., and Daims, H.: Low yield and abiotic origin of N2O formed
by the complete nitrifier Nitrospira inopinata, Nat. Commun., 10, 1836, https://doi.org/10.1038/s41467-019-09790-x, 2019.
Kroeze, C., Dumont, E., and Seitzinger, S.: Future trends in emissions of
N2O from rivers and estuaries, J. Integr. Environ. Sci., 7, 71–78,
2010.
Laperriere, S. M., Nidzieko, N. J., Fox, R. J., Fisher, A. W., and Santoro, A.
E.: Observations of variable ammonia oxidation and nitrous oxide flux in a
eutrophic estuary, Estuar. Coast., 42, 33–44, 2019.
Lin, H., Dai, M., Kao, S. J., Wang, L., Roberts, E., Yang, J., Huang, T.,
and He, B.: Spatiotemporal variability of nitrous oxide in a large eutrophic
estuarine system: The Pearl River Estuary, China, Mar. Chem., 182, 14–24,
2016.
Liu, C., Hou, L., Liu, M., Zheng, Y., Yin, G., Han, P., Dong, H., Gao, J.,
Gao, D., Chang, Y., and Zhang, Z.: Coupling of denitrification and anaerobic
ammonium oxidation with nitrification in sediments of the Yangtze Estuary:
Importance and controlling factors, Estuar. Coast. Shelf. S., 220, 64–72,
2019.
Löscher, C. R., Kock, A., Könneke, M., LaRoche, J., Bange, H. W., and Schmitz, R. A.: Production of oceanic nitrous oxide by ammonia-oxidizing archaea, Biogeosciences, 9, 2419–2429, https://doi.org/10.5194/bg-9-2419-2012, 2012.
Lund, M. B., Smith, J. M., and Francis, C. A.: Diversity, abundance and
expression of nitrite reductase (nirK)-like genes in marine thaumarchaea, ISME
J., 6, 1966–1977, 2012.
Maeda, K., Toyoda, S., Philippot, L., Hattori, S., Nakajima, K., Ito, Y.,
and Yoshida, N.: Relative Contribution of
nirK- and nirS- Bacterial Denitrifiers as Well as
Fungal Denitrifiers to Nitrous Oxide Production from Dairy Manure Compost,
Environ. Sci. Technol., 51, 14083–14091, 2017.
Magalhães, C., Bano, N., Wiebe, W. J., Bordalo, A. A., and Hollibaugh,
J. T.: Dynamics of nitrous oxide reductase genes (nosZ) in intertidal rocky
biofilms and sediments of the Douro River Estuary (Portugal), and their
relation to N-biogeochemistry, Microb. Ecol., 55, 259–269, 2008.
Mandernack, K. W., Mills, C. T., Johnson, C. A., Rahn, T., and Kinney, C.:
The δ15N and δ18O values of N2O produced
during the co-oxidation of ammonia by methanotrophic bacteria, Chem. Geol.,
267, 96–107, 2009.
Mincer, T. J., Church, M. J., Taylor, L. T., Preston, C., Karl, D. M., and
DeLong, E. F.: Quantitative distribution of presumptive archaeal and
bacterial nitrifiers in Monterey Bay and the North Pacific Subtropical Gyre,
Environ. Microbiol., 9, 1162–1175, 2007.
Mohn, J., Wolf, B., Toyoda, S., Lin, C. T., Liang, M. C., Brüggemann,
N., Wissel, H., Steiker, A. E., Dyckmans, J., Szwec, L., Ostrom, N. E., Casciotti,
K. L., Forbes, M., Giesemann, A., Well, R., Doucett, R. R., Yarnes, C. T.,
Ridley, A. R., Kaiser, J., and Yoshida, N.: Interlaboratory assessment of
nitrous oxide isotopomer analysis by isotope ratio mass spectrometry and
laser spectroscopy: current status and perspectives, Rapid Commun. Mass
Spectrom. 28, 1995–2007, 2014.
Monteiro, M., Séneca, J., and Magalhães, C.: The History of Aerobic
Ammonia Oxidizers: from the First Discoveries to Today, J. Microbiol., 52,
537–547, 2014.
Moore, W. S., Sarmiento, J. L., and Key, R. M.: Tracing the Amazon component
of surface Atlantic water using 228Ra, salinity and silica, J. Geophys.
Res., 91, 2574–2580, 1986.
Mortazavi, B., Iverson, R. L., Huang, W., Graham Lewis, F., and Caffrey, J. M.:
Nitrogen budget of Apalachicola Bay, a bar-built estuary in the northeastern
Gulf of Mexico, Mar. Ecol.-Prog. Ser., 195, 1–14, 2000.
Naqvi, S. W. A., Bange, H. W., Farías, L., Monteiro, P. M. S., Scranton, M. I., and Zhang, J.: Marine hypoxia/anoxia as a source of CH4 and N2O, Biogeosciences, 7, 2159–2190, https://doi.org/10.5194/bg-7-2159-2010, 2010.
Nevison, C. D., Lueker, T. J., and Weiss, R. F.: Quantifying the nitrous
oxide source from coastal upwelling, Global Biogeochem. Cy., 18, GB1018, https://doi.org/10.1029/2003GB002110,
2004.
Ni, B. J., Peng, L., Law, Y., Guo, J., and Yuan, Z.: Modeling of
Nitrous Oxide Production by Autotrophic Ammonia-Oxidizing Bacteria with
Multiple Production Pathways, Environ. Sci. Technol., 48, 3916–3924, 2014.
Pai, S. C., Tsau, Y. J., and Yang, T. I.: pH and buffering capacity problems
involved in the determination of ammonia in saline water using the
indophenol blue spectrophotometric method, Anal. Chim. Acta, 434,
209–216, 2001.
Penn, J., Weber, T., and Deutsch, C.: Microbial functional diversity alters
the structure and sensitivity of oxygen deficient zones, J. Geophys. Res.
Lett., 43, 9773–9780, 2016.
Pike, N.: Using false discovery rates for multiple comparisons in ecology
and evolution, Methods Ecol. Evol., 2, 278–282, 2011.
Rabalais, N. N., Díaz, R. J., Levin, L. A., Turner, R. E., Gilbert, D., and Zhang, J.: Dynamics and distribution of natural and human-caused hypoxia, Biogeosciences, 7, 585–619, https://doi.org/10.5194/bg-7-585-2010, 2010.
Rajkumar, A. N., Barnes, J., Ramesh, R., Purvaja, R., and Upstill-Goddard,
R. C.: Methane and nitrous oxide fluxes in the polluted Adyar River and
estuary, SE India, Mar. Pollut. Bull., 56, 2043–2051, 2008.
Ravishankara, A. R., Daniel, J. S., and Portmann, R. W.: Nitrous Oxide
(N2O): The Dominant Ozone-Depleting Substance Emitted in the 21st
Century, Science, 326, 123–125, 2009.
Raymond, P. A. and Cole, J. J.: Gas exchange in rivers and estuary:
choosing a gas transfer velocity, Estuar. Coast., 24, 312–317, 2001.
Santoro, A. E., Buchwald, C., McIlvin, M. R., and Casciotti K. L.: Isotopic
Signature of N2O Produced by Marine Ammonia-Oxidizing Archaea, Science,
333, 1282–1285, 2011.
Santoro, A. E: The do-it-all nitrifier, Science, 351, 342–343, 2016.
Seitzinger, S. P. and Kroeze, C.: Global distribution of nitrous oxide
production and N inputs in freshwater and coastal marine ecosystems, Global
Biogeochem. Cy., 12, 93–113, 1998.
Shaw, L. J., Nicol, G. W., Smith, Z., Fear, J., Prosser, J. I., and Baggs, E.
M.: Nitrosospira spp. can produce nitrous oxide via a nitrifier denitrification pathway,
Environ. Microbiol., 8, 214–222, 2006.
Stein, L. Y.: Surveying N2O-Producing Pathways in Bacteria, Methods
Enzymol., 486, 131–152, 2011.
Stieglmeier, M., Mooshammer, M., Kitzler, B., Wanek, W.,
Zechmeister-Boltenstern, S., Richter, A., and Schleper, C.: Aerobic nitrous
oxide production through N-nitrosating hybrid formation in ammonia-oxidizing
archaea, ISME J., 8, 1135–1146, 2014.
Sutka, R. L., Ostrom, N. E., Ostrom, P. H., Gandhi, H., and Breznak, J. A.:
Nitrogen isotopomer site preference of N2O produced by Nitrosomonas
europaea and Methylococcus capsulatus Bath, Rapid Commun. Mass Spectrom.,
17, 738–745, 2003.
Sutka, R. L., Ostrom, N. E., Ostrom, P. H., Breznak, J. A., Gandhi, H.,
Pitt, A. J., and Li, F.: Distinguishing Nitrous Oxide Production from
Nitrification and Denitrification on the Basis of Isotopomer Abundances,
Appl. Environ. Microbiol., 72, 638–644, 2006.
Syakila, A. and Kroeze, C.: The global nitrogen budget revisited, J.
Greenhouse Gas Meas. Manag., 1, 17–26, 2011.
Tan, E., Zou, W., Jiang, X., Wan, X., Hsu, T. C., Zheng, Z., Chen, L., Xu,
M., Dai, M., and Kao, S.: Organic matter decomposition sustains sedimentary
nitrogen loss in the Pearl River Estuary, China, Sci. Total. Environ., 648,
508–517, 2019
Ter Braak, C. J. F. Canonical correspondence analysis: a new eigenvector
technique for multivariate direct gradient analysis, Ecology, 67,
1167–1179, 1986.
Toyoda, S., Mutobe, H., Yamagishi, H., Yoshida, N., and Tanji, Y.: Fractionation
of N2O isotopomers during production by denitrifier, Soil. Biol.
Biochem., 37, 1535–1545, 2005.
Toyoda, S., Yoshida, N., and Koba, K.: Isotopocule analysis of biologically
produced nitrous oxide in various environments, Mass Spectrom. Rev., 36,
135–160, 2017.
Treusch, A. H., Leininger, S., Kletzin, A., Schuster, S. C., Klenk, H., and
Schleper, C.: Novel genes for nitrite reductase and Amo-related proteins
indicate a role of uncultivated mesophilic crenarchaeota in nitrogen
cycling, Environ. Microbiol., 7, 1985–1995, 2005.
Usui, T., Koike, I., and Ogura, N.: N2O production, nitrification and
denitrification in an estuarine sediment, Estuar. Coast. Shelf S., 52,
769–781, 2001.
Voss, M., Bange, H. W., Dippner, J. W., Middelburg, J. J., Montoya, J. P.,
and Ward, B.: The marine nitrogen cycle: recent discoveries, uncertainties
and the potential relevance of climate change, Philos. T. Roy. Soc.
B, 368, 20130121, https://doi.org/10.1098/rstb.2013.0121, 2013.
Wang, J., Kan, J., Qian, G., Chen, J., Xia, Z., Zhang, X., Liu, H., and Sun,
J.: Denitrification and anammox: Understanding nitrogen loss from Yangtze
Estuary to the east China sea (ECS), Environ. Pollut., 252, 1659–1670, https://doi.org/10.1016/j.envpol.2019.06.025, 2019.
Wanninkhof, R. I. K.: Relationship between wind speed and gas exchange over
the ocean, J. Geophys. Res.-Ocean., 97, 7373–7382, 1992.
Ward, B. B.: Nitrification in marine systems, in: Nitrogen in the Marine
Environment (2nd Edn.), edited by: Capone, D. G., Bronk, D.
A., Mulholl, M. R., and Carpenter, E. J., Burlington, Academic Press, 199–261, 2008.
Weiss, R. F. and Price, B. A.: Nitrous oxide solubility in water and
seawater, Mar. Chem., 8, 347–359, 1980.
Yamagishi, H., Westley, M. B., Popp, B. N., Toyoda, S., Yoshida, N.,
Watanabe, S., Koba, K., and Yamanak, Y.: Role of nitrification and
denitrification on the nitrous oxide cycle in the eastern tropical North
Pacific and Gulf of California, J Geophy. Res., 112, G02015,
https://doi.org/10.1029/2006JG000227, 2007.
Yoshida, T. and Alexander, M.: Nitrous Oxide Formation by Nitrosomonas
europaea and Heterotrophic Microorganisms, Soil Sci. Soc. Am. Pro., 34,
880–882, 1970.
Yu, R., Kampschreur, M. J., Mark van Loosdrecht, C. M., and Chandran, K.:
Mechanisms and Specific Directionality of Autotrophic Nitrous Oxide and
Nitric Oxide Generation during Transient Anoxia, Environ. Sci. Technol., 44,
1313–1319, 2010.
Zhang, Y., Xie, X., Jiao, N., Hsiao, S. S.-Y., and Kao, S.-J.: Diversity and distribution of amoA-type nitrifying and nirS-type denitrifying microbial communities in the Yangtze River estuary, Biogeosciences, 11, 2131–2145, https://doi.org/10.5194/bg-11-2131-2014, 2014.
Zhu, R., Liu, Y., Li, X., Sun, J., Xu, H. and Sun, L.: Stable isotope
natural abundance of nitrous oxide emitted from Antarctic tundra soils:
effects of sea animal excrement depositions, Rapid Commun. Mass Sp.,
22, 3570–3578, 2008.
Short summary
The major microbial process producing N2O in estuarine ecosystems remains controversial. Combining the concentrations and isotopic compositions of N2O, distributions and transcript levels of ammonia-oxidizing bacterial and archaeal amoA and denitrifier nirS genes, and in situ incubation estimates of nitrification rates and N2O production rates, we clarified that ammonia-oxidizing bacteria contributed the major part in N2O production in the upper Pearl River estuary despite their low abundance.
The major microbial process producing N2O in estuarine ecosystems remains controversial....
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