Articles | Volume 18, issue 23
https://doi.org/10.5194/bg-18-6271-2021
© Author(s) 2021. 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-18-6271-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
07 Dec 2021
Research article |
| 07 Dec 2021
| 07 Dec 2021
A modelling study of temporal and spatial pCO2 variability on the biologically active and temperature-dominated Scotian Shelf
Krysten Rutherford
CORRESPONDING AUTHOR
Department of Oceanography, Dalhousie University, 1355 Oxford Street, Halifax, Nova Scotia, B3H 4R2, Canada
Katja Fennel
Department of Oceanography, Dalhousie University, 1355 Oxford Street, Halifax, Nova Scotia, B3H 4R2, Canada
Dariia Atamanchuk
Department of Oceanography, Dalhousie University, 1355 Oxford Street, Halifax, Nova Scotia, B3H 4R2, Canada
Douglas Wallace
Department of Oceanography, Dalhousie University, 1355 Oxford Street, Halifax, Nova Scotia, B3H 4R2, Canada
Helmuth Thomas
Department of Oceanography, Dalhousie University, 1355 Oxford Street, Halifax, Nova Scotia, B3H 4R2, Canada
Institute of Coastal Research, Helmholtz Center Geesthacht, 215502 Geesthacht, Germany
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Krysten Rutherford, Katja Fennel, Lina Garcia Suarez, and Jasmin G. John
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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 Gerke, Toste Tanhua, William A. Nesbitt, Samuel W. Stevens, and Douglas W. R. Wallace
EGUsphere, https://doi.org/10.5194/egusphere-2025-3999, https://doi.org/10.5194/egusphere-2025-3999, 2025
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Transient tracer data, measured for the first time in 2022 in the Gulf of St. Lawrence, reveal older deep waters in the east than the west, contrary to expected estuarine circulation, indicating increased influence of older, warmer, less oxygenated North Atlantic Central Water over younger, oxygen-rich Labrador Current Water. While consistent with previous reports of increasing NACW contribution, our results contradict claims of a complete shift to NACW by 2021, showing that LCW still persists.
Feifei Liu, Ute Daewel, Jan Kossack, Kubilay Timur Demir, Helmuth Thomas, and Corinna Schrum
Biogeosciences, 22, 3699–3719, https://doi.org/10.5194/bg-22-3699-2025, https://doi.org/10.5194/bg-22-3699-2025, 2025
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Ocean alkalinity enhancement (OAE) boosts oceanic CO₂ absorption, offering a climate solution. Using a regional model, we examined OAE in the North Sea, revealing that shallow coastal areas achieve higher CO₂ uptake than offshore where alkalinity is more susceptible to deep-ocean loss. Long-term carbon storage is limited, and pH shifts vary by location. Our findings guide OAE deployment to optimize carbon removal while minimizing ecological effects, supporting global climate mitigation efforts.
Arnaud Laurent, Bin Wang, Dariia Atamanchuk, Subhadeep Rakshit, Kumiko Azetsu-Scott, Chris Algar, and Katja Fennel
EGUsphere, https://doi.org/10.5194/egusphere-2025-3361, https://doi.org/10.5194/egusphere-2025-3361, 2025
This preprint is open for discussion and under review for Biogeosciences (BG).
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Surface ocean alkalinity enhancement, through the release of alkaline materials, is a technology that could increase the storage of anthropogenic carbon in the ocean. Halifax Harbour (Canada) is a current test site for operational alkalinity addition. Here, we present a model of Halifax Harbour that simulates alkalinity addition at various locations of the harbour and quantifies the resulting net CO2 uptake. The model can be relocated to study alkalinity addition in other coastal systems.
Lina Garcia-Suarez, Katja Fennel, Neha Mehendale, Tronje Peer Kemena, and David Peter Keller
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This study shows that regional ocean warming can make the Gulf Stream appear to shift north, even when its path remains stable in a changing climate. Temperature-based proxies, like the Gulf Stream North Wall, overestimate changes in its position. Methods based on sea surface height provide a more accurate view. These results help improve how we track changes in ocean currents and avoid misinterpreting signs of climate-related shifts.
Kubilay Timur Demir, Moritz Mathis, Jan Kossack, Feifei Liu, Ute Daewel, Christoph Stegert, Helmuth Thomas, and Corinna Schrum
Biogeosciences, 22, 2569–2599, https://doi.org/10.5194/bg-22-2569-2025, https://doi.org/10.5194/bg-22-2569-2025, 2025
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This study examines how variations in the ratios of carbon, nitrogen, and phosphorus in organic matter affect carbon cycling in the northwest European shelf seas. Traditional models with fixed ratios tend to underestimate biological carbon uptake. By integrating variable ratios into a regional model, we find that carbon dioxide uptake increases by 9 %–31 %. These results highlight the need to include variable ratios for accurate assessments of regional and global carbon cycles.
Gianpiero Cossarini, Andrew Moore, Stefano Ciavatta, and Katja Fennel
State Planet, 5-opsr, 12, https://doi.org/10.5194/sp-5-opsr-12-2025, https://doi.org/10.5194/sp-5-opsr-12-2025, 2025
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Marine biogeochemistry refers to the cycling of chemical elements resulting from physical transport, chemical reaction, uptake, and processing by living organisms. Biogeochemical models can have a wide range of complexity, from a single nutrient to fully explicit representations of multiple nutrients, trophic levels, and functional groups. Uncertainty sources are the lack of knowledge about the parameterizations, the initial and boundary conditions, and the lack of observations.
William A. Nesbitt, Samuel W. Stevens, Alfonso O. Mucci, Lennart Gerke, Toste Tanhua, Gwénaëlle Chaillou, and Douglas W. R. Wallace
EGUsphere, https://doi.org/10.5194/egusphere-2025-2400, https://doi.org/10.5194/egusphere-2025-2400, 2025
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We use 20 years of oxygen measurements and recent carbon data with a tracer-calibrated 1D model to quantify oxygen loss and inorganic carbon accumulation in the deep waters of the Gulf and St. Lawrence Estuary. We further utilize the model to give a first estimate of the impact of adding pure oxygen, a by-product from green hydrogen production to these deep waters. Results show this could restore oxygen to year-2000 levels, but full recovery would require a larger input.
Claudia Elena Schmidt, Tristan Zimmermann, Katarzyna Koziorowska, Daniel Pröfrock, and Helmuth Thomas
EGUsphere, https://doi.org/10.5194/egusphere-2025-291, https://doi.org/10.5194/egusphere-2025-291, 2025
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This study explores how ocean currents, melting sea ice, and freshwater runoff alter biogeochemical cycles on the west Greenland shelf. By analyzing water samples on a high-resolution, large-scale grid, we found that these factors create distinct regional and spatial distribution patterns and significantly impact biological productivity during late summer. The study highlights the need for ongoing monitoring to understand the effects of climate change in this sensitive area.
Kyoko Ohashi, Arnaud Laurent, Christoph Renkl, Jinyu Sheng, Katja Fennel, and Eric Oliver
Geosci. Model Dev., 17, 8697–8733, https://doi.org/10.5194/gmd-17-8697-2024, https://doi.org/10.5194/gmd-17-8697-2024, 2024
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We developed a modelling system of the northwest Atlantic Ocean that simulates the currents, temperature, salinity, and parts of the biochemical cycle of the ocean, as well as sea ice. The system combines advanced, open-source models and can be used to study, for example, the ocean capture of atmospheric carbon dioxide, which is a key process in the global climate. The system produces realistic results, and we use it to investigate the roles of tides and sea ice in the northwest Atlantic Ocean.
Mona Norbisrath, Justus E. E. van Beusekom, and Helmuth Thomas
Ocean Sci., 20, 1423–1440, https://doi.org/10.5194/os-20-1423-2024, https://doi.org/10.5194/os-20-1423-2024, 2024
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We present an observational study investigating total alkalinity (TA) in the Dutch Wadden Sea. Discrete water samples were used to identify the TA spatial distribution patterns and locate and shed light on TA sources. By observing a tidal cycle, the sediments and pore water exchange were identified as local TA sources. We assumed metabolically driven CaCO3 dissolution as the TA source in the upper, oxic sediments and anaerobic metabolic processes as TA sources in the deeper, anoxic ones.
Julia Meyer, Yoana G. Voynova, Bryce Van Dam, Lara Luitjens, Dagmar Daehne, and Helmuth Thomas
EGUsphere, https://doi.org/10.5194/egusphere-2024-3048, https://doi.org/10.5194/egusphere-2024-3048, 2024
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The study highlights the inter-seasonal variability of the carbonate dynamics of the East Frisian Wadden Sea, the world's largest intertidal area. During spring, increased biological activity leads to lower CO2 and nitrate levels, while total alkalinity (TA) rises slightly. In summer, TA increases, enhancing the ocean's ability to absorb CO2. Our research emphasizes the vital role of these intertidal regions in regulating carbon, contributing to a better understanding of carbon storage.
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.
Robert W. Izett, Katja Fennel, Adam C. Stoer, and David P. Nicholson
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This paper provides an overview of the capacity to expand the global coverage of marine primary production estimates using autonomous ocean-going instruments, called Biogeochemical-Argo floats. We review existing approaches to quantifying primary production using floats, provide examples of the current implementation of the methods, and offer insights into how they can be better exploited. This paper is timely, given the ongoing expansion of the Biogeochemical-Argo array.
Alizée Dale, Marion Gehlen, Douglas W. R. Wallace, Germain Bénard, Christian Éthé, and Elena Alekseenko
EGUsphere, https://doi.org/10.5194/egusphere-2023-2538, https://doi.org/10.5194/egusphere-2023-2538, 2023
Preprint archived
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Diatom, which is at the base of a productive food chain that supports valuable fisheries, dominates the total primary production of the Labrador Sea (LS). The synthesis of biogenic silica frustules makes them peculiar among phytoplankton but also dependent on dissolved silicate (DSi). Regular oceanographic surveys show declining DSi concentrations since the mid-1990s. With a model-based approach, we show that weakening deep winter convection was the proximate cause of DSi decline in the LS.
Li-Qing Jiang, Adam V. Subhas, Daniela Basso, Katja Fennel, and Jean-Pierre Gattuso
State Planet, 2-oae2023, 13, https://doi.org/10.5194/sp-2-oae2023-13-2023, https://doi.org/10.5194/sp-2-oae2023-13-2023, 2023
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This paper provides comprehensive guidelines for ocean alkalinity enhancement (OAE) researchers on archiving their metadata and data. It includes data standards for various OAE studies and a universal metadata template. Controlled vocabularies for terms like alkalinization methods are included. These guidelines also apply to ocean acidification data.
Katja Fennel, Matthew C. Long, Christopher Algar, Brendan Carter, David Keller, Arnaud Laurent, Jann Paul Mattern, Ruth Musgrave, Andreas Oschlies, Josiane Ostiguy, Jaime B. Palter, and Daniel B. Whitt
State Planet, 2-oae2023, 9, https://doi.org/10.5194/sp-2-oae2023-9-2023, https://doi.org/10.5194/sp-2-oae2023-9-2023, 2023
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This paper describes biogeochemical models and modelling techniques for applications related to ocean alkalinity enhancement (OAE) research. Many of the most pressing OAE-related research questions cannot be addressed by observation alone but will require a combination of skilful models and observations. We present illustrative examples with references to further information; describe limitations, caveats, and future research needs; and provide practical recommendations.
Mona Norbisrath, Andreas Neumann, Kirstin Dähnke, Tina Sanders, Andreas Schöl, Justus E. E. van Beusekom, and Helmuth Thomas
Biogeosciences, 20, 4307–4321, https://doi.org/10.5194/bg-20-4307-2023, https://doi.org/10.5194/bg-20-4307-2023, 2023
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Total alkalinity (TA) is the oceanic capacity to store CO2. Estuaries can be a TA source. Anaerobic metabolic pathways like denitrification (reduction of NO3− to N2) generate TA and are a major nitrogen (N) sink. Another important N sink is anammox that transforms NH4+ with NO2− into N2 without TA generation. By combining TA and N2 production, we identified a TA source, denitrification, occurring in the water column and suggest anammox as the dominant N2 producer in the bottom layer of the Ems.
Stefania A. Ciliberti, Enrique Alvarez Fanjul, Jay Pearlman, Kirsten Wilmer-Becker, Pierre Bahurel, Fabrice Ardhuin, Alain Arnaud, Mike Bell, Segolene Berthou, Laurent Bertino, Arthur Capet, Eric Chassignet, Stefano Ciavatta, Mauro Cirano, Emanuela Clementi, Gianpiero Cossarini, Gianpaolo Coro, Stuart Corney, Fraser Davidson, Marie Drevillon, Yann Drillet, Renaud Dussurget, Ghada El Serafy, Katja Fennel, Marcos Garcia Sotillo, Patrick Heimbach, Fabrice Hernandez, Patrick Hogan, Ibrahim Hoteit, Sudheer Joseph, Simon Josey, Pierre-Yves Le Traon, Simone Libralato, Marco Mancini, Pascal Matte, Angelique Melet, Yasumasa Miyazawa, Andrew M. Moore, Antonio Novellino, Andrew Porter, Heather Regan, Laia Romero, Andreas Schiller, John Siddorn, Joanna Staneva, Cecile Thomas-Courcoux, Marina Tonani, Jose Maria Garcia-Valdecasas, Jennifer Veitch, Karina von Schuckmann, Liying Wan, John Wilkin, and Romane Zufic
State Planet, 1-osr7, 2, https://doi.org/10.5194/sp-1-osr7-2-2023, https://doi.org/10.5194/sp-1-osr7-2-2023, 2023
Nele Lehmann, Hugues Lantuit, Michael Ernst Böttcher, Jens Hartmann, Antje Eulenburg, and Helmuth Thomas
Biogeosciences, 20, 3459–3479, https://doi.org/10.5194/bg-20-3459-2023, https://doi.org/10.5194/bg-20-3459-2023, 2023
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Riverine alkalinity in the silicate-dominated headwater catchment at subarctic Iskorasfjellet, northern Norway, was almost entirely derived from weathering of minor carbonate occurrences in the riparian zone. The uphill catchment appeared limited by insufficient contact time of weathering agents and weatherable material. Further, alkalinity increased with decreasing permafrost extent. Thus, with climate change, alkalinity generation is expected to increase in this permafrost-degrading landscape.
Benjamin Richaud, Katja Fennel, Eric C. J. Oliver, Michael D. DeGrandpre, Timothée Bourgeois, Xianmin Hu, and Youyu Lu
The Cryosphere, 17, 2665–2680, https://doi.org/10.5194/tc-17-2665-2023, https://doi.org/10.5194/tc-17-2665-2023, 2023
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Sea ice is a dynamic carbon reservoir. Its seasonal growth and melt modify the carbonate chemistry in the upper ocean, with consequences for the Arctic Ocean carbon sink. Yet, the importance of this process is poorly quantified. Using two independent approaches, this study provides new methods to evaluate the error in air–sea carbon flux estimates due to the lack of biogeochemistry in ice in earth system models. Those errors range from 5 % to 30 %, depending on the model and climate projection.
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.
Arnaud Laurent, Haiyan Zhang, and Katja Fennel
Biogeosciences, 19, 5893–5910, https://doi.org/10.5194/bg-19-5893-2022, https://doi.org/10.5194/bg-19-5893-2022, 2022
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The Changjiang is the main terrestrial source of nutrients to the East China Sea (ECS). Nutrient delivery to the ECS has been increasing since the 1960s, resulting in low oxygen (hypoxia) during phytoplankton decomposition in summer. River phosphorus (P) has increased less than nitrogen, and therefore, despite the large nutrient delivery, phytoplankton growth can be limited by the lack of P. Here, we investigate this link between P limitation, phytoplankton production/decomposition, and hypoxia.
Mona Norbisrath, Johannes Pätsch, Kirstin Dähnke, Tina Sanders, Gesa Schulz, Justus E. E. van Beusekom, and Helmuth Thomas
Biogeosciences, 19, 5151–5165, https://doi.org/10.5194/bg-19-5151-2022, https://doi.org/10.5194/bg-19-5151-2022, 2022
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Total alkalinity (TA) regulates the oceanic storage capacity of atmospheric CO2. TA is also metabolically generated in estuaries and influences coastal carbon storage through its inflows. We used water samples and identified the Hamburg port area as the one with highest TA generation. Of the overall riverine TA load, 14 % is generated within the estuary. Using a biogeochemical model, we estimated potential effects on the coastal carbon storage under possible anthropogenic and climate changes.
Bryce Van Dam, Nele Lehmann, Mary A. Zeller, Andreas Neumann, Daniel Pröfrock, Marko Lipka, Helmuth Thomas, and Michael Ernst Böttcher
Biogeosciences, 19, 3775–3789, https://doi.org/10.5194/bg-19-3775-2022, https://doi.org/10.5194/bg-19-3775-2022, 2022
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We quantified sediment–water exchange at shallow sites in the North and Baltic seas. We found that porewater irrigation rates in the former were approximately twice as high as previously estimated, likely driven by relatively high bioirrigative activity. In contrast, we found small net fluxes of alkalinity, ranging from −35 µmol m−2 h−1 (uptake) to 53 µmol m−2 h−1 (release). We attribute this to low net denitrification, carbonate mineral (re-)precipitation, and sulfide (re-)oxidation.
Jannes Koelling, Dariia Atamanchuk, Johannes Karstensen, Patricia Handmann, and Douglas W. R. Wallace
Biogeosciences, 19, 437–454, https://doi.org/10.5194/bg-19-437-2022, https://doi.org/10.5194/bg-19-437-2022, 2022
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In this study, we investigate oxygen variability in the deep western boundary current in the Labrador Sea from multiyear moored records. We estimate that about half of the oxygen taken up in the interior Labrador Sea by air–sea gas exchange during deep water formation is exported southward the same year. Our results underline the complexity of the oxygen uptake and export in the Labrador Sea and highlight the important role this region plays in supplying oxygen to the deep ocean.
Bin Wang, Katja Fennel, and Liuqian Yu
Ocean Sci., 17, 1141–1156, https://doi.org/10.5194/os-17-1141-2021, https://doi.org/10.5194/os-17-1141-2021, 2021
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We demonstrate that even sparse BGC-Argo profiles can substantially improve biogeochemical prediction via a priori model tuning. By assimilating satellite surface chlorophyll and physical observations, subsurface distributions of physical properties and nutrients were improved immediately. The improvement of subsurface chlorophyll was modest initially but was greatly enhanced after adjusting the parameterization for light attenuation through further a priori tuning.
Thomas S. Bianchi, Madhur Anand, Chris T. Bauch, Donald E. Canfield, Luc De Meester, Katja Fennel, Peter M. Groffman, Michael L. Pace, Mak Saito, and Myrna J. Simpson
Biogeosciences, 18, 3005–3013, https://doi.org/10.5194/bg-18-3005-2021, https://doi.org/10.5194/bg-18-3005-2021, 2021
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Better development of interdisciplinary ties between biology, geology, and chemistry advances biogeochemistry through (1) better integration of contemporary (or rapid) evolutionary adaptation to predict changing biogeochemical cycles and (2) universal integration of data from long-term monitoring sites in terrestrial, aquatic, and human systems that span broad geographical regions for use in modeling.
Luca Possenti, Ingunn Skjelvan, Dariia Atamanchuk, Anders Tengberg, Matthew P. Humphreys, Socratis Loucaides, Liam Fernand, and Jan Kaiser
Ocean Sci., 17, 593–614, https://doi.org/10.5194/os-17-593-2021, https://doi.org/10.5194/os-17-593-2021, 2021
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A Seaglider was deployed for 8 months in the Norwegian Sea mounting an oxygen and, for the first time, a CO2 optode and a chlorophyll fluorescence sensor. The oxygen and CO2 data were used to assess the spatial and temporal variability and calculate the net community production, N(O2) and N(CT). The dataset was used to calculate net community production from inventory changes, air–sea flux, diapycnal mixing and entrainment.
Arnaud Laurent, Katja Fennel, and Angela Kuhn
Biogeosciences, 18, 1803–1822, https://doi.org/10.5194/bg-18-1803-2021, https://doi.org/10.5194/bg-18-1803-2021, 2021
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CMIP5 and CMIP6 models, and a high-resolution regional model, were evaluated by comparing historical simulations with observations in the northwest North Atlantic, a climate-sensitive and biologically productive ocean margin region. Many of the CMIP models performed poorly for biological properties. There is no clear link between model resolution and skill in the global models, but there is an overall improvement in performance in CMIP6 from CMIP5. The regional model performed best.
Nicolai von Oppeln-Bronikowski, Brad de Young, Dariia Atamanchuk, and Douglas Wallace
Ocean Sci., 17, 1–16, https://doi.org/10.5194/os-17-1-2021, https://doi.org/10.5194/os-17-1-2021, 2021
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This paper describes challenges around the direct measurement of CO2 in the ocean using ocean gliders. We discuss our method of using multiple sensor platforms as test beds to carry out observing experiments and highlight the implications of our study for future glider missions. We also show high-resolution measurements and discuss challenges and lessons learned in the context of future ocean gas measurements.
Haiyan Zhang, Katja Fennel, Arnaud Laurent, and Changwei Bian
Biogeosciences, 17, 5745–5761, https://doi.org/10.5194/bg-17-5745-2020, https://doi.org/10.5194/bg-17-5745-2020, 2020
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In coastal seas, low oxygen, which is detrimental to coastal ecosystems, is increasingly caused by man-made nutrients from land. This is especially so near mouths of major rivers, including the Changjiang in the East China Sea. Here a simulation model is used to identify the main factors determining low-oxygen conditions in the region. High river discharge is identified as the prime cause, while wind and intrusions of open-ocean water modulate the severity and extent of low-oxygen conditions.
Chantal Mears, Helmuth Thomas, Paul B. Henderson, Matthew A. Charette, Hugh MacIntyre, Frank Dehairs, Christophe Monnin, and Alfonso Mucci
Biogeosciences, 17, 4937–4959, https://doi.org/10.5194/bg-17-4937-2020, https://doi.org/10.5194/bg-17-4937-2020, 2020
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Major research initiatives have been undertaken within the Arctic Ocean, highlighting this area's global importance and vulnerability to climate change. In 2015, the international GEOTRACES program addressed this importance by devoting intense research activities to the Arctic Ocean. Among various tracers, we used radium and carbonate system data to elucidate the functioning and vulnerability of the hydrographic regime of the Canadian Arctic Archipelago, bridging the Pacific and Atlantic oceans.
Cited articles
Arruda, R., Atamanchuk, D., Cronin, M., Steinhoff, T., and Wallace, D. W.:
At-sea intercomparison of three underway pCO2 systems, Limnol.
Oceanogr. Meth., 18, 63–76, https://doi.org/10.1002/lom3.10346, 2020. a, b
Bakker, D. C. E., Pfeil, B., Landa, C. S., Metzl, N., O'Brien, K. M., Olsen, A., Smith, K., Cosca, C., Harasawa, S., Jones, S. D., Nakaoka, S., Nojiri, Y., Schuster, U., Steinhoff, T., Sweeney, C., Takahashi, T., Tilbrook, B., Wada, C., Wanninkhof, R., Alin, S. R., Balestrini, C. F., Barbero, L., Bates, N. R., Bianchi, A. A., Bonou, F., Boutin, J., Bozec, Y., Burger, E. F., Cai, W.-J., Castle, R. D., Chen, L., Chierici, M., Currie, K., Evans, W., Featherstone, C., Feely, R. A., Fransson, A., Goyet, C., Greenwood, N., Gregor, L., Hankin, S., Hardman-Mountford, N. J., Harlay, J., Hauck, J., Hoppema, M., Humphreys, M. P., Hunt, C. W., Huss, B., Ibánhez, J. S. P., Johannessen, T., Keeling, R., Kitidis, V., Körtzinger, A., Kozyr, A., Krasakopoulou, E., Kuwata, A., Landschützer, P., Lauvset, S. K., Lefèvre, N., Lo Monaco, C., Manke, A., Mathis, J. T., Merlivat, L., Millero, F. J., Monteiro, P. M. S., Munro, D. R., Murata, A., Newberger, T., Omar, A. M., Ono, T., Paterson, K., Pearce, D., Pierrot, D., Robbins, L. L., Saito, S., Salisbury, J., Schlitzer, R., Schneider, B., Schweitzer, R., Sieger, R., Skjelvan, I., Sullivan, K. F., Sutherland, S. C., Sutton, A. J., Tadokoro, K., Telszewski, M., Tuma, M., van Heuven, S. M. A. C., Vandemark, D., Ward, B., Watson, A. J., and Xu, S.: A multi-decade record of high-quality fCO2 data in version 3 of the Surface Ocean CO2 Atlas (SOCAT), Earth Syst. Sci. Data, 8, 383–413, https://doi.org/10.5194/essd-8-383-2016, 2016 (data available at: https://www.socat.info/, last access: October 2020). a
Beardsley, R. C. and Boicourt, W. C.: On Estuarine and Continental-Shelf
Circulation in the Middle Atlantic Bight, in: Evolution of Physical
Oceanography, MIT Press, Cambridge, 198–233, 1981. a
Brennan, C. E., Bianucci, L., and Fennel, K.: Sensitivity of northwest North
Atlantic shelf circulation to surface and boundary forcing: A regional
model assessment, Atmosphere-Ocean, 54, 230–247,
https://doi.org/10.1080/07055900.2016.1147416, 2016. a, b, c
Cai, W.-J.: Estuarine and Coastal Ocean Carbon Paradox: CO2 Sinks or Sites
of Terrestrial Carbon Incineration?, Annu. Rev. Mar. Sci., 3,
123–145, https://doi.org/10.1146/annurev-marine-120709-142723, 2011. a
Cai, W.-J., Dai, M., and Wang, Y.: Air-sea exchange of carbon dioxide in ocean
margins: A province-based synthesis, Geophys. Res. Lett., 33, L12603,
https://doi.org/10.1029/2006GL026219, 2006. a
Cai, W.-J., Chen, L., Chen, B., Gao, Z., Lee, S. H., Chen, J., Pierrot, D.,
Sullivan, K., Wang, Y., Hu, X., Huang, W.-J., Zhang, Y., Xu, S., Murata, A.,
Grebmeier, J. M., Jones, E. P., and Zhang, H.: Decrease in the CO2
Uptake Capacity in an Ice-Free Arctic Ocean Basin, Science, 329, 556–559,
https://doi.org/10.1126/science.1189338, 2010. a
Chavez, F. P., Pennington, J. T., Michisaki, R. P., Blum, M., Chavez, G. M., Friederich, J., Jones, B., Herlien, R., Kieft, B., Hobson, B., Ren, A. S., Ryan, J., Sevadjian, J. C., Wahl, C., Walz, K. R., Yamahara, K., Friederich, G. E., and Messié, M.:
Climate variability and change: response of a coastal ocean ecosystem,
Oceanography, 30, 128–145, 2017. a, b
Chen, C.-T. A. and Borges, A. V.: Reconciling opposing views on carbon cycling
in the coastal ocean: Continental shelves as sinks and near-shore ecosystems
as sources of atmospheric CO2, Deep-Sea Res. Pt. II, 56, 578–590, https://doi.org/10.1016/j.dsr2.2009.01.001,
2009. a, b
Chen, C.-T. A., Huang, T.-H., Chen, Y.-C., Bai, Y., He, X., and Kang, Y.: Air–sea exchanges of CO2 in the world's coastal seas, Biogeosciences, 10, 6509–6544, https://doi.org/10.5194/bg-10-6509-2013, 2013. a
Craig, S. E., Thomas, H., Jones, C. T., Li, W. K. W., Greenan, B. J. W.,
Shadwick, E. H., and Burt, W. J.: The effect of seasonality in phytoplankton
community composition on CO2 uptake on the Scotian Shelf, J.
Marine Syst., 147, 52–60, https://doi.org/10.1016/j.jmarsys.2014.07.006, 2015. a
Crameri, F.: Scientific Colour-maps, Zenodo [data set],
https://doi.org/10.5281/zenodo.1243862, 2018. a
Dee, D. P., Uppala, S. M., Simmons, A. J., Berrisford, P., Poli, P., Kobayashi, S., Andrae, U., Balmaseda, M. A., Balsamo, G., Bauer, P., Bechtold, P., Beljaars, A. C. M., van de Berg, L., Bidlot, J., Bormann, N., Delsol, C., Dragani, R., Fuentes,M., Geer, A. J., Haimberger, L., Healy, S. B., Hersbach, H., Hólm, E. V., Isaksen, L., Kållberg, P., Köhler, M., Matricardi, M., McNally, A. P., Monge-Sanz, B. M., Morcrette, J.-J., Park, B.-K., Peubey, C., de Rosnay, P., Tavolato, C., Thépaut, J.-N., and Vitart, F.: The ERA-Interim
reanalysis: Configuration and performance of the data assimilation system,
Q. J. Roy. Meteor. Soc., 137, 553–597, 2011. a
Dever, M., Hebert, D., Greenan, B., Sheng, J., and Smith, P.: Hydrography and
coastal circulation along the Halifax Line and the connections with the Gulf
of St. Lawrence, Atmosphere-Ocean, 54, 199–217,
https://doi.org/10.1080/07055900.2016.1189397, 2016. a
Doney, S. C.: The Growing Human Footprint on Coastal and Open Ocean
Biogeochemistry, Science, 328, 1512–1516, https://doi.org/10.1126/science.1185198,
2010. a
Egbert, G. D. and Erofeeva, S. Y.: Efficient inverse modeling of barotropic
ocean tides, J. Atmos. Ocean. Tech., 19, 183–204, https://doi.org/10.1175/1520-0426(2002)019<0183:EIMOBO>2.0.CO;2, 2002. a
Environment and Climate Change Canada: Canadian Greenhouse Gas Measurement
Program, available at:
https://www.canada.ca/en/environment-climate-change/services/climate-change/science-research-data/greenhouse-gases-aerosols-monitoring/canadian-greenhouse-gas-measurement-program.html, last access: March 2016. a
Evans, W., Hales, B., Strutton, P. G., Shearman, R. K., and Barth, J. A.:
Failure to bloom: Intense upwelling results in negligible phytoplankton
response and prolonged CO2 outgassing over the Oregon shelf, J.
Geophys. Res.-Oceans, 120, 1446–1461,
https://doi.org/10.1002/2014JC010580, 2015. a
Feely, R. A., Sabine, C. L., Hernandez-Ayon, J. M., Ianson, D., and Hales, B.:
Evidence for upwelling of corrosive “acidified” water onto the continental
shelf, Science, 320, 1490–1492, https://doi.org/10.1126/science.1155676, 2008. a, b
Fennel, K. and Wilkin, J.: Quantifying biological carbon export for the
northwest North Atlantic continental shelves, Geophys. Res.
Lett., 36, L18605, https://doi.org/10.1029/2009GL039818, 2009. a, b
Fennel, K., Wilkin, J., Levin, J., Moisan, J., O'Reilly, J., and Haidvogel, D.:
Nitrogen cycling in the Middle Atlantic Bight: Results from a
three-dimensional model and implications for the North Atlantic nitrogen
budget, Global Biogeochem. Cy., 20, GB3007, https://doi.org/10.1029/2005GB002456, 2006. a, b
Fennel, K., Alin, S., Barbero, L., Evans, W., Bourgeois, T., Cooley, S., Dunne, J., Feely, R. A., Hernandez-Ayon, J. M., Hu, X., Lohrenz, S., Muller-Karger, F., Najjar, R., Robbins, L., Shadwick, E., Siedlecki, S., Steiner, N., Sutton, A., Turk, D., Vlahos, P., and Wang, Z. A.: Carbon cycling in the North American coastal ocean: a synthesis, Biogeosciences, 16, 1281–1304, https://doi.org/10.5194/bg-16-1281-2019, 2019. a, b, c, d, e
Fiechter, J., Curchitser, E. N., Edwards, C. A., Chai, F., Goebel, N. L., and
Chavez, F. P.: Air-sea CO2 fluxes in the California Current: Impacts of
model resolution and coastal topography, Global Biogeochem. Cy., 28,
371–385, https://doi.org/10.1002/2013GB004683, 2014. a
Fournier, R. O., Marra, J., Bohrer, R., and Det, M. V.: Plankton Dynamics and
Nutrient Enrichment of the Scotian Shelf, Journal of the Fisheries Board
of Canada, 34, 1004–1018, https://doi.org/10.1139/f77-153, 1977. a
Fratantoni, P. S. and Pickart, R. S.: The western North Atlantic
shelfbreak current system in summer, J. Phys. Oceanogr., 37,
2509–2533, https://doi.org/10.1175/JPO3123.1, 2007. a, b
Geshelin, Y., Sheng, J., and Greatbatch, R. J.: Monthly mean climatologies of
temperature and salinity in the western North Atlantic, Tech. rep.,
Canadian Data Report of Hydrography and Ocean Sciences, Fisheries and Oceans
Canada, 1999. a
Gruber, N.: Carbon at the coastal interface, Nature, 517, 148–149,
https://doi.org/10.1038/nature14082, 2015. a
Gruber, N., Clement, D., Carter, B. R., Feely, R. A., Van Heuven, S., Hoppema, M., Ishii, M., Key, R. M., Kozyr, A., Lauvset, S. K., Monaco, C. L., Mathis, J. T., Murata, A., Olsen, A., Perez, F. F., Sabine, C. L., Tanhua, T., and Wanninkhof, R.: The oceanic
sink for anthropogenic CO2 from 1994 to 2007, Science, 363, 1193–1199,
https://doi.org/10.1126/science.aau5153, 2019. a
Haidvogel, D., Arango, H., Budgell, W., Cornuelle, B., Curchitser, E., Di
Lorenzo, E., Fennel, K., Geyer, W., Hermann, A., Lanerolle, L., Levin, J.,
McWilliams, J., Miller, A., Moore, A., Powell, T., Shchepetkin, A., Sherwood,
C., Signell, R., Warner, J., and Wilkin, J.: Ocean forecasting in
terrain-following coordinates: Formulation and skill assessment of the
Regional Ocean Modeling System, J. Comput. Phys., 227,
3595–3624, https://doi.org/10.1016/j.jcp.2007.06.016, 2008 (code available at: https://www.myroms.org, last access: 1 May 2011). a, b
Hannah, C. G., Shore, J. A., Loder, J. W., and Naimie, C. E.: Seasonal
circulation on the western and central Scotian Shelf, J.
Phys. Oceanogr., 31, 591–615,
https://doi.org/10.1175/1520-0485(2001)031<0591:SCOTWA>2.0.CO;2, 2001. a
Hauri, C., Schultz, C., Hedstrom, K., Danielson, S., Irving, B., Doney, S. C., Dussin, R., Curchitser, E. N., Hill, D. F., and Stock, C. A.: A regional hindcast model simulating ecosystem dynamics, inorganic carbon chemistry, and ocean acidification in the Gulf of Alaska, Biogeosciences, 17, 3837–3857, https://doi.org/10.5194/bg-17-3837-2020, 2020. a
Hickey, B. M.: Coastal oceanography of western North America from the tip
of Baja California to Vancouver Island, in: The Global Coastal
Ocean: Regional Studies and Syntheses, Vol. 11, 345–393, Wiley
& Sons, New York, 1998. a
Ho, D. T., Law, C. S., Smith, M. J., Schlosser, P., Harvey, M., and Hill, P.:
Measurements of air-sea gas exchange at high wind speeds in the Southern
Ocean: Implications for global parameterizations, Geophys. Res.
Lett., 33, L16611, https://doi.org/10.1029/2006GL026817, 2006. a
Landschützer, P., Gruber, N., Bakker, D. C., and Schuster, U.: Recent
variability of the global ocean carbon sink, Global Biogeochem. Cy.,
28, 927–949, https://doi.org/10.1002/2014GB004853, 2014. a
Laruelle, G. G., Dürr, H. H., Slomp, C. P., and Borges, A. V.: Evaluation
of sinks and sources of CO2 in the global coastal ocean using a
spatially-explicit typology of estuaries and continental shelves, Geophys.
Res. Lett., 37, L15607, https://doi.org/10.1029/2010GL043691, 2010. a
Laruelle, G. G., Lauerwald, R., Rotschi, J., Raymond, P. A., Hartmann, J., and Regnier, P.: Seasonal response of air–water CO2 exchange along the land–ocean aquatic continuum of the northeast North American coast., Biogeosciences, 12, 1447–1458, https://doi.org/10.5194/bg-12-1447-2015, 2015. a, b, c, d, e, f, g, h
Laruelle, G. G., Landschützer, P., Gruber, N., Tison, J.-L., Delille, B., and Regnier, P.: Global high-resolution monthly pCO2 climatology for the coastal ocean derived from neural network interpolation, Biogeosciences, 14, 4545–4561, https://doi.org/10.5194/bg-14-4545-2017, 2017. a
Laurent, A., Fennel, K., Cai, W.-J., Huang, W.-J., Barbero, L., and Wanninkhof,
R.: Eutrophication-induced acidification of coastal waters in the northern
Gulf of Mexico: Insights into origin and processes from a coupled
physical-biogeochemical model, Geophys. Res. Lett., 44, 946–956,
https://doi.org/10.1002/2016GL071881, 2017. a
Le Quéré, C., Andrew, R. M., Friedlingstein, P., Sitch, S., Pongratz, J., Manning, A. C., Korsbakken, J. I., Peters, G. P., Canadell, J. G., Jackson, R. B., Boden, T. A., Tans, P. P., Andrews, O. D., Arora, V. K., Bakker, D. C. E., Barbero, L., Becker, M., Betts, R. A., Bopp, L., Chevallier, F., Chini, L. P., Ciais, P., Cosca, C. E., Cross, J., Currie, K., Gasser, T., Harris, I., Hauck, J., Haverd, V., Houghton, R. A., Hunt, C. W., Hurtt, G., Ilyina, T., Jain, A. K., Kato, E., Kautz, M., Keeling, R. F., Klein Goldewijk, K., Körtzinger, A., Landschützer, P., Lefèvre, N., Lenton, A., Lienert, S., Lima, I., Lombardozzi, D., Metzl, N., Millero, F., Monteiro, P. M. S., Munro, D. R., Nabel, J. E. M. S., Nakaoka, S., Nojiri, Y., Padin, X. A., Peregon, A., Pfeil, B., Pierrot, D., Poulter, B., Rehder, G., Reimer, J., Rödenbeck, C., Schwinger, J., Séférian, R., Skjelvan, I., Stocker, B. D., Tian, H., Tilbrook, B., Tubiello, F. N., van der Laan-Luijkx, I. T., van der Werf, G. R., van Heuven, S., Viovy, N., Vuichard, N., Walker, A. P., Watson, A. J., Wiltshire, A. J., Zaehle, S., and Zhu, D.: Global Carbon Budget 2017, Earth Syst. Sci. Data, 10, 405–448, https://doi.org/10.5194/essd-10-405-2018, 2018. a
Lemay, J., Thomas, H., Craig, S. E., Burt, W. J., Fennel, K., and Greenan, B. J. W.: Hurricane Arthur and its effect on the short-term variability of pCO2 on the Scotian Shelf, NW Atlantic, Biogeosciences, 15, 2111–2123, https://doi.org/10.5194/bg-15-2111-2018, 2018. a
Loder, J. W., Han, G., Hannah, C. G., Greenberg, D. A., and Smith, P. C.:
Hydrography and baroclinic circulation in the Scotian Shelf region:
winter versus summer, Can. J. Fish. Aquat. Sci.,
54, 40–56, https://doi.org/10.1139/f96-153, 1997. a
Mehrbach, C., Culberson, C. H., Hawley, J. E., and Pytkowicx, R. M.:
Measurement of the Apparent Dissociation Constants of Carbonic Acid in
Seawater at Atmospheric Pressure, Limnol. Oceanogr., 18, 897–907,
https://doi.org/10.4319/lo.1973.18.6.0897, 1973. a
Millero, F. J.: Thermodynamics of the carbon dioxide system in the oceans,
Geochim. Cosmochim. Ac., 59, 661–677,
https://doi.org/10.1016/0016-7037(94)00354-O, 1995. a
Mills, E. L. and Fournier, R. O.: Fish production and the marine ecosystems of
the Scotian Shelf, eastern Canada, Mar. Biol., 54, 101–108,
https://doi.org/10.1007/BF00386589, 1979. a
Petrie, B., Topliss, B. J., and Wright, D. G.: Coastal upwelling and eddy
development off Nova Scotia, J. Geophys. Res.-Oceans, 92,
12979–12991, https://doi.org/10.1029/JC092iC12p12979, 1987. a
Previdi, M., Fennel, K., Wilkin, J., and Haidvogel, D.: Interannual variability
in atmospheric CO2 uptake on the northeast U.S. continental shelf,
J. Geophys. Res., 114, G04003, https://doi.org/10.1029/2008JG000881,
2009. a
Rheuban, J. E., Doney, S. C., McCorkle, D. C., and Jakuba, R. W.: Quantifying
the effects of nutrient enrichment and freshwater mixing on coastal ocean
acidification, J. Geophys. Res.-Oceans, 124, 9085–9100,
https://doi.org/10.1029/2019JC015556, 2019. a, b
Rödenbeck, C., Bakker, D. C. E., Gruber, N., Iida, Y., Jacobson, A. R., Jones, S., Landschützer, P., Metzl, N., Nakaoka, S., Olsen, A., Park, G.-H., Peylin, P., Rodgers, K. B., Sasse, T. P., Schuster, U., Shutler, J. D., Valsala, V., Wanninkhof, R., and Zeng, J.: Data-based estimates of the ocean carbon sink variability – first results of the Surface Ocean pCO2 Mapping intercomparison (SOCOM), Biogeosciences, 12, 7251–7278, https://doi.org/10.5194/bg-12-7251-2015, 2015. a
Roobaert, A., Laruelle, G. G., Landschützer, P., Gruber, N., Chou, L., and
Regnier, P.: The spatiotemporal dynamics of the sources and sinks of CO2
in the global coastal ocean, Global Biogeochem. Cy., 33, 1693–1714,
https://doi.org/10.1029/2019GB006239, 2019. a, b, c
Ross, T., Craig, S. E., Comeau, A., Davis, R., Dever, M., and Beck, M.: Blooms
and subsurface phytoplankton layers on the Scotian Shelf: Insights from
profiling gliders, J. Marine Syst., 172, 118–127,
https://doi.org/10.1016/j.jmarsys.2017.03.007, 2017. a
Seitzinger, S. P., Harrison, J. A., Dumont, E., Beusen, A. H. W., and Bouwman,
A. F.: Sources and delivery of carbon, nitrogen, and phosphorus to the
coastal zone: An overview of Global Nutrient Export from Watersheds (NEWS)
models and their application, Global Biogeochem. Cy., 19, GB4S01,
https://doi.org/10.1029/2005GB002606, 2005. a
Shadwick, E. and Thomas, H.: Seasonal and spatial variability in the CO2
system on the Scotian Shelf (Northwest Atlantic), Mar. Chem.,
160, 42–55, https://doi.org/10.1016/j.marchem.2014.01.009, 2014. a, b
Shadwick, E. H., Thomas, H., Comeau, A., Craig, S. E., Hunt, C. W., and Salisbury, J. E.: Air-Sea CO2 fluxes on the Scotian Shelf: seasonal to multi-annual variability, Biogeosciences, 7, 3851–3867, https://doi.org/10.5194/bg-7-3851-2010, 2010. a, b, c
Shadwick, E., Thomas, H., Azetsu-Scott, K., Greenan, B., Head, E., and Horne,
E.: Seasonal variability of dissolved inorganic carbon and surface water
pCO2 in the Scotian Shelf region of the Northwestern Atlantic,
Mar. Chem., 124, 23–37, https://doi.org/10.1016/j.marchem.2010.11.004, 2011. a, b, c, d, e, f
Shan, S., Sheng, J., Ohashi, K., and Dever, M.: Assessing the performance of a
multi-nested ocean circulation model using satellite remote sensing and in
situ observations, Satellite Oceanography and Meteorology, 1, 39–59,
https://doi.org/10.18063/SOM.2016.01.004, 2016.
a
Signorini, S. R., Mannino, A., Najjar, R. G., Friedrichs, M. A., Cai, W. J.,
Salisbury, J., Wang, Z. A., Thomas, H., and Shadwick, E.: Surface ocean
pCO2 seasonality and sea-air CO2 flux estimates for the North
American east coast, J. Geophys. Res.-Oceans, 118,
5439–5460, https://doi.org/10.1002/jgrc.20369, 2013. a, b, c, d, e, f
Takahashi, T., Sutherland, S. C., Sweeney, C., Poisson, A., Metzl, N.,
Tilbrook, B., Bates, N., Wanninkhof, R., Feely, R. A., Sabine, C., Olafsson,
J., and Nojiri, Y.: Global sea air CO2 flux based on climatological
surface ocean pCO2, and seasonal biological and temperature effects,
Deep-Sea Res. Pt. II, 49, 1601–1622,
https://doi.org/10.1016/S0967-0645(02)00003-6, 2002. a, b
Tsunogai, S., Watanabe, S., and Sato, T.: Is there a “continental shelf pump”
for the absorption of atmospheric CO2?, Tellus B, 51, 701–712,
https://doi.org/10.1034/j.1600-0889.1999.t01-2-00010.x, 1999. a
Turi, G., Lachkar, Z., and Gruber, N.: Spatiotemporal variability and drivers of pCO2 and air–sea CO2 fluxes in the California Current System: an eddy-resolving modeling study, Biogeosciences, 11, 671–690, https://doi.org/10.5194/bg-11-671-2014, 2014. a
Umlauf, L. and Burchard, H.: A generic length-scale equation for geophysical
turbulence models, J. Marine Res., 61, 235–265,
https://doi.org/10.1357/002224003322005087, 2003. a
Urrego-Blanco, J. and Sheng, J.: Interannual variability of the circulation
over the Eastern Canadian shelf, Atmosphere-Ocean, 50, 277–300,
https://doi.org/10.1080/07055900.2012.680430, 2012. a, b
Vandemark, D., Salisbury, J. E., Hunt, C. W., Shellito, S. M., Irish, J.,
McGillis, W., Sabine, C., and Maenner, S.: Temporal and spatial dynamics of
CO2 air-sea flux in the Gulf of Maine, J. Geophys.
Res.-Oceans, 116, C01012, https://doi.org/10.1029/2010JC006408, 2011. a, b
Warner, J. C., Sherwood, C. R., Arango, H. G., and Signell, R. P.: Performance
of four turbulence closure models implemented using a generic length scale
method, Ocean Model., 8, 81–113, https://doi.org/10.1016/j.ocemod.2003.12.003,
2005. a
Weiss, R. F.: Carbon dioxide in water and seawater: The solubility of a
non-ideal gas, Mar. Chem., 2, 203–215, 1974. a
Wu, H. and Zhu, J.: Advection scheme with 3rd high-order spatial interpolation
at the middle temporal level and its application to saltwater intrusion in
the Changjiang Estuary, Ocean Model., 33, 33–51,
https://doi.org/10.1016/j.ocemod.2009.12.001, 2010. a
Xiu, P., Chai, F., Curchitser, E. N., and Castruccio, F. S.: Future changes in
coastal upwelling ecosystems with global warming: The case of the
California Current System, Sci. Rep. UK, 8, 2866,
https://doi.org/10.1038/s41598-018-21247-7, 2018. a
Zeebe, R. E. and Wolf-Gladrow, D. A.: CO2 in Seawater – Equilibrium,
Kinetics, Isotopes, 65, 1st Edn., Elsevier Science B.V., Amsterdam, 2001. a
Short summary
Using a regional model of the northwestern North Atlantic shelves in combination with a surface water time series and repeat transect observations, we investigate surface CO2 variability on the Scotian Shelf. The study highlights a strong seasonal cycle in shelf-wide pCO2 and spatial variability throughout the summer months driven by physical events. The simulated net flux of CO2 on the Scotian Shelf is out of the ocean, deviating from the global air–sea CO2 flux trend in continental shelves.
Using a regional model of the northwestern North Atlantic shelves in combination with a surface...
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