Articles | Volume 17, issue 4
https://doi.org/10.5194/bg-17-963-2020
© Author(s) 2020. 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-17-963-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
24 Feb 2020
Research article |
| 24 Feb 2020
| 24 Feb 2020
Basal thermal regime affects the biogeochemistry of subglacial systems
Department of Earth and Atmospheric Science, University of Alberta,
Edmonton AB, T6G 2E3, Canada
Martin Sharp
Department of Earth and Atmospheric Science, University of Alberta,
Edmonton AB, T6G 2E3, Canada
Brad Danielson
Department of Earth and Atmospheric Science, University of Alberta,
Edmonton AB, T6G 2E3, Canada
Fiera Biological Consulting, Suite 301, 10359-82 Ave, Edmonton AB,
T6E 1Z9, Canada
Alireza Saidi-Mehrabad
Department of Biological Sciences, University of Alberta, Edmonton
AB, T6G 2E3, Canada
Joel Barker
School of Earth Sciences, The Ohio State University, Marion 43302,
USA
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Our study presents a new interpretation from surface-based geophysical data of the subglacial material beneath Devon Ice Cap in the Canadian Arctic, where a subglacial lake was thought to exist based on the analysis of airborne geophysical data. Here, we demonstrate that there is no evidence of subglacial water, and the subglacial lake has likely been misidentified.
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Biogeosciences, 18, 5903–5927, https://doi.org/10.5194/bg-18-5903-2021, https://doi.org/10.5194/bg-18-5903-2021, 2021
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Mara Freilich, Alexandre Mignot, Glenn Flierl, and Raffaele Ferrari
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Shuangling Chen, Mark L. Wells, Rui Xin Huang, Huijie Xue, Jingyuan Xi, and Fei Chai
Biogeosciences, 18, 5539–5554, https://doi.org/10.5194/bg-18-5539-2021, https://doi.org/10.5194/bg-18-5539-2021, 2021
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Pierre Damien, Julio Sheinbaum, Orens Pasqueron de Fommervault, Julien Jouanno, Lorena Linacre, and Olaf Duteil
Biogeosciences, 18, 4281–4303, https://doi.org/10.5194/bg-18-4281-2021, https://doi.org/10.5194/bg-18-4281-2021, 2021
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Sergey V. Stanichny, Elena A. Kubryakova, and Arseny A. Kubryakov
Biogeosciences, 18, 3173–3188, https://doi.org/10.5194/bg-18-3173-2021, https://doi.org/10.5194/bg-18-3173-2021, 2021
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In this paper, we show that the short-term impact of tropical cyclones can trigger the intense, long-term bloom of coccolithophores, which are major marine calcifiers playing an important role in the balance and fluxes of inorganic carbon in the ocean. In our paper, we describe the evolution of and physical reasons for such an unusual bloom observed in autumn 2005 in the Black Sea on the basis of satellite data.
Fengshan Liu, Ying Chen, Nini Bai, Dengpan Xiao, Huizi Bai, Fulu Tao, and Quansheng Ge
Biogeosciences, 18, 2275–2287, https://doi.org/10.5194/bg-18-2275-2021, https://doi.org/10.5194/bg-18-2275-2021, 2021
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The sowing date is key to the surface biophysical processes in the winter dormancy period. The climate effect of the sowing date shift is therefore very interesting and may contribute to the mitigation of climate change. An earlier sowing date always had a higher LAI but a higher temperature in the dormancy period and a lower temperature in the growth period. The main reason was the relative contributions of the surface albedo and energy partitioning processes.
Peter Aartsma, Johan Asplund, Arvid Odland, Stefanie Reinhardt, and Hans Renssen
Biogeosciences, 18, 1577–1599, https://doi.org/10.5194/bg-18-1577-2021, https://doi.org/10.5194/bg-18-1577-2021, 2021
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In the literature, it is generally assumed that alpine lichen heaths keep their direct environment cool due to their relatively high albedo. However, we reveal that the soil temperature and soil heat flux are higher below lichens than below shrubs during the growing season, despite a lower net radiation for lichens. We also show that the differences in microclimatic conditions between these two vegetation types are more pronounced during warm and sunny days than during cold and cloudy days.
Oleg Sizov, Ekaterina Ezhova, Petr Tsymbarovich, Andrey Soromotin, Nikolay Prihod'ko, Tuukka Petäjä, Sergej Zilitinkevich, Markku Kulmala, Jaana Bäck, and Kajar Köster
Biogeosciences, 18, 207–228, https://doi.org/10.5194/bg-18-207-2021, https://doi.org/10.5194/bg-18-207-2021, 2021
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In changing climate, tundra is expected to turn into shrubs and trees, diminishing reindeer pasture and increasing risks of tick-borne diseases. However, this transition may require a disturbance. Fires in Siberia are increasingly widespread. We studied wildfire dynamics and tundra–forest transition over 60 years in northwest Siberia near the Arctic Circle. Based on satellite data analysis, we found that transition occurs in 40 %–85 % of burned tundra compared to 5 %–15 % in non-disturbed areas.
Kaveh Purkiani, André Paul, Annemiek Vink, Maren Walter, Michael Schulz, and Matthias Haeckel
Biogeosciences, 17, 6527–6544, https://doi.org/10.5194/bg-17-6527-2020, https://doi.org/10.5194/bg-17-6527-2020, 2020
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There has been a steady increase in interest in mining of deep-sea minerals in the eastern Pacific Ocean recently. The ocean state in this region is known to be highly influenced by rotating bodies of water (eddies), some of which can travel long distances in the ocean and impact the deeper layers of the ocean. Better insight into the variability of eddy activity in this region is of great help to mitigate the impact of the benthic ecosystem from future potential deep-sea mining activity.
Jing Yan, Nathaniel A. Bogie, and Teamrat A. Ghezzehei
Biogeosciences, 17, 6377–6392, https://doi.org/10.5194/bg-17-6377-2020, https://doi.org/10.5194/bg-17-6377-2020, 2020
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An uneven supply of water and nutrients in soils often drives how plants behave. We observed that plants extract all their required nutrients from dry soil patches in sufficient quantity, provided adequate water is available elsewhere in the root zone. Roots in nutrient-rich dry patches facilitate the nutrient acquisition by extensive growth, water release, and modifying water retention in their immediate environment. The findings are valuable in managing nutrient losses in agricultural systems.
Onur Kerimoglu, Yoana G. Voynova, Fatemeh Chegini, Holger Brix, Ulrich Callies, Richard Hofmeister, Knut Klingbeil, Corinna Schrum, and Justus E. E. van Beusekom
Biogeosciences, 17, 5097–5127, https://doi.org/10.5194/bg-17-5097-2020, https://doi.org/10.5194/bg-17-5097-2020, 2020
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In this study, using extensive field observations and a numerical model, we analyzed the physical and biogeochemical structure of a coastal system following an extreme flood event. Our results suggest that a number of anomalous observations were driven by a co-occurrence of peculiar meteorological conditions and increased riverine discharges. Our results call for attention to the combined effects of hydrological and meteorological extremes that are anticipated to increase in frequency.
Amandine Erktan, Matthias C. Rillig, Andrea Carminati, Alexandre Jousset, and Stefan Scheu
Biogeosciences, 17, 4961–4980, https://doi.org/10.5194/bg-17-4961-2020, https://doi.org/10.5194/bg-17-4961-2020, 2020
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Soil aggregation is crucial for soil functioning. While the role of bacteria and fungi in soil aggregation is well established, how predators feeding on microbes modify soil aggregation has hardly been investigated. We showed for the first time that protists modify soil aggregation, presumably through changes in the production of bacterial mucilage, and that collembolans reduce soil aggregation, presumably by reducing the abundance of saprotrophic fungi.
Wei Hu, Kotaro Murata, Chunlan Fan, Shu Huang, Hiromi Matsusaki, Pingqing Fu, and Daizhou Zhang
Biogeosciences, 17, 4477–4487, https://doi.org/10.5194/bg-17-4477-2020, https://doi.org/10.5194/bg-17-4477-2020, 2020
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This paper reports the first estimate of the status of bacteria in long-distance-transported Asian dust, demonstrating that airborne dust, which can carry viable and nonviable bacteria on particle surfaces, is an efficient medium for constantly spreading bacteria at regional and even global scales. Such data are essential to better model and understand the roles and activities of bioaerosols in environmental evolution and climate change and the potential risks of bioaerosols to human health.
Inge Grünberg, Evan J. Wilcox, Simon Zwieback, Philip Marsh, and Julia Boike
Biogeosciences, 17, 4261–4279, https://doi.org/10.5194/bg-17-4261-2020, https://doi.org/10.5194/bg-17-4261-2020, 2020
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Based on topsoil temperature data for different vegetation types at a low Arctic tundra site, we found large small-scale variability. Winter temperatures were strongly influenced by vegetation through its effects on snow. Summer temperatures were similar below most vegetation types and not consistently related to late summer permafrost thaw depth. Given that vegetation type defines the relationship between winter and summer soil temperature and thaw depth, it controls permafrost vulnerability.
Long Jiang, Theo Gerkema, Jacco C. Kromkamp, Daphne van der Wal, Pedro Manuel Carrasco De La Cruz, and Karline Soetaert
Biogeosciences, 17, 4135–4152, https://doi.org/10.5194/bg-17-4135-2020, https://doi.org/10.5194/bg-17-4135-2020, 2020
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A seaward increasing chlorophyll-a gradient is observed during the spring bloom in a Dutch tidal bay. Biophysical model runs indicate the roles of bivalve grazing and tidal import in shaping the gradient. Five common spatial phytoplankton patterns are summarized in global estuarine–coastal ecosystems: seaward increasing, seaward decreasing, concave with a chlorophyll maximum, weak spatial gradients, and irregular patterns.
Emil De Borger, Justin Tiano, Ulrike Braeckman, Tom Ysebaert, and Karline Soetaert
Biogeosciences, 17, 1701–1715, https://doi.org/10.5194/bg-17-1701-2020, https://doi.org/10.5194/bg-17-1701-2020, 2020
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By applying a novel technique to quantify organism-induced sediment–water column fluid exchange (bioirrigation), we show that organisms in subtidal (permanently submerged) areas have similar bioirrigation rates as those that inhabit intertidal areas (not permanently submerged), but organisms in the latter irrigate deeper burrows in this study. Our results expand on traditional methods to quantify bioirrigation rates and broaden the pool of field measurements of bioirrigation rates.
Sheila N. Estrada-Allis, Julio Sheinbaum Pardo, Joao M. Azevedo Correia de Souza, Cecilia Elizabeth Enríquez Ortiz, Ismael Mariño Tapia, and Jorge A. Herrera-Silveira
Biogeosciences, 17, 1087–1111, https://doi.org/10.5194/bg-17-1087-2020, https://doi.org/10.5194/bg-17-1087-2020, 2020
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Continental shelves are the most productive areas in the ocean and can have an important impact on the nutrient cycle as well as the climate system. The one in Yucatán is the largest shelf in the Gulf of Mexico. However, its nutrient budget remains unidentifiable. Here we propose not only a general nutrient budget for the Yucatán Shelf but also the physical processes responsible for its pathway modulation through a physical–biogeochemical coupled model of the whole Gulf of Mexico.
Audrey Delpech, Anna Conchon, Olivier Titaud, and Patrick Lehodey
Biogeosciences, 17, 833–850, https://doi.org/10.5194/bg-17-833-2020, https://doi.org/10.5194/bg-17-833-2020, 2020
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Micronekton is an important, yet poorly known, component of the trophic chain, which partly contributes to the storage of CO2 in the deep ocean thanks to biomass vertical migrations. In this study, we characterize the ideal sampling regions to estimate the amount of biomass that undergoes theses migrations. We find that observations made in warm, nondynamic and productive waters reduce the error of the estimation by 20 %. This result should likely serve for future in situ network deployment.
Filippos Tagklis, Takamitsu Ito, and Annalisa Bracco
Biogeosciences, 17, 231–244, https://doi.org/10.5194/bg-17-231-2020, https://doi.org/10.5194/bg-17-231-2020, 2020
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Deoxygenation of the oceans is potentially one of the most severe ecosystem stressors resulting from global warming given the high sensitivity of dissolved oxygen to ocean temperatures. Climate models suggest that despite the thermodynamic tendency of the oceans to lose oxygen, certain regions experience significant changes in the biologically driven O2 consumption, resulting in a resistance against deoxygenation. Overturning circulation changes are responsible for such a behavior.
Mohammad Abdul Halim, Han Y. H. Chen, and Sean C. Thomas
Biogeosciences, 16, 4357–4375, https://doi.org/10.5194/bg-16-4357-2019, https://doi.org/10.5194/bg-16-4357-2019, 2019
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Using field data collected over 4 years across a range of stand ages, we investigated how seasonal surface albedo in boreal forest varies with stand age, stand structure, and composition. Our results indicate that successional change in species composition is a key driver of age–related patterns in albedo, with hardwood species associated with higher albedo. The patterns described have important implications for both climate modeling and
climate–smartboreal forest management.
Paul A. Moore, Maxwell C. Lukenbach, Dan K. Thompson, Nick Kettridge, Gustaf Granath, and James M. Waddington
Biogeosciences, 16, 3491–3506, https://doi.org/10.5194/bg-16-3491-2019, https://doi.org/10.5194/bg-16-3491-2019, 2019
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Using very-high-resolution digital elevation models (DEMs), we assessed the basic structure and microtopographic variability of hummock–hollow plots at boreal and hemi-boreal sites primarily in North America. Using a simple model of peatland biogeochemical function, our results suggest that both surface heating and moss productivity may not be adequately resolved in models which only consider idealized hummock–hollow units.
Renee K. Gruber, Ryan J. Lowe, and James L. Falter
Biogeosciences, 16, 1921–1935, https://doi.org/10.5194/bg-16-1921-2019, https://doi.org/10.5194/bg-16-1921-2019, 2019
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Researchers from the University of Western Australia's Oceans Institute are studying large tides (up to 12 m range) that occur in the Kimberley region of Australia. These tides flush coral reefs with water rich in nutrients, which supports the growth of reef organisms. In this paper, we show how tidal cycles and seasons control nutrient availability on reefs. This study is among the first published accounts of reefs and water quality data in the remote and pristine Kimberley region.
Sergey A. Marakushev and Ol'ga V. Belonogova
Biogeosciences, 16, 1817–1828, https://doi.org/10.5194/bg-16-1817-2019, https://doi.org/10.5194/bg-16-1817-2019, 2019
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Among the existing theories of the autotrophic origin of life, CO2 is usually considered to be the carbon source for nascent autotrophic metabolism. However, ancestral carbon used in metabolism may have been derived from CH4 if the outflow of magma fluid to the surface of the Earth consisted mainly of methane. The hydrothermal system model is considered in the form of a phase diagram, which demonstrates the area of redox and P and T conditions favorable to development of primary methanotroph.
Venugopal Thushara, Puthenveettil Narayana Menon Vinayachandran, Adrian J. Matthews, Benjamin G. M. Webber, and Bastien Y. Queste
Biogeosciences, 16, 1447–1468, https://doi.org/10.5194/bg-16-1447-2019, https://doi.org/10.5194/bg-16-1447-2019, 2019
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Chlorophyll distribution in the ocean remains to be explored in detail, despite its climatic significance. Here, we document the vertical structure of chlorophyll in the Bay of Bengal using observations and a model. The shape of chlorophyll profiles, characterized by prominent deep chlorophyll maxima, varies in dynamically different regions, controlled by the monsoonal forcings. The present study provides new insights into the vertical distribution of chlorophyll, rarely observed by satellites.
Soeren Thomsen, Johannes Karstensen, Rainer Kiko, Gerd Krahmann, Marcus Dengler, and Anja Engel
Biogeosciences, 16, 979–998, https://doi.org/10.5194/bg-16-979-2019, https://doi.org/10.5194/bg-16-979-2019, 2019
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Physical and biogeochemical observations from an autonomous underwater vehicle in combination with ship-based measurements are used to investigate remote and local drivers of the oxygen and nutrient variability off Mauritania. Beside the transport of oxygen and nutrients characteristics from remote areas towards Mauritania also local remineralization of organic material close to the seabed seems to be important for the distribution of oxygen and nutrients.
Pascale Bouruet-Aubertot, Yannis Cuypers, Andrea Doglioli, Mathieu Caffin, Christophe Yohia, Alain de Verneil, Anne Petrenko, Dominique Lefèvre, Hervé Le Goff, Gilles Rougier, Marc Picheral, and Thierry Moutin
Biogeosciences, 15, 7485–7504, https://doi.org/10.5194/bg-15-7485-2018, https://doi.org/10.5194/bg-15-7485-2018, 2018
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The OUTPACE cruise took place between New Caledonia and French Polynesia. The main purpose was to understand how micro-organisms can survive in a very poor environment. One main source of nutrients is at depth, below the euphotic layer where micro-organisms live. The purpose of the turbulence measurements was to determine to which extent turbulence may
upliftnutrients into the euphotic layer. The origin of the turbulence that was found contrasted along the transect was also determined.
Daniel D. Richter, Sharon A. Billings, Peter M. Groffman, Eugene F. Kelly, Kathleen A. Lohse, William H. McDowell, Timothy S. White, Suzanne Anderson, Dennis D. Baldocchi, Steve Banwart, Susan Brantley, Jean J. Braun, Zachary S. Brecheisen, Charles W. Cook, Hilairy E. Hartnett, Sarah E. Hobbie, Jerome Gaillardet, Esteban Jobbagy, Hermann F. Jungkunst, Clare E. Kazanski, Jagdish Krishnaswamy, Daniel Markewitz, Katherine O'Neill, Clifford S. Riebe, Paul Schroeder, Christina Siebe, Whendee L. Silver, Aaron Thompson, Anne Verhoef, and Ganlin Zhang
Biogeosciences, 15, 4815–4832, https://doi.org/10.5194/bg-15-4815-2018, https://doi.org/10.5194/bg-15-4815-2018, 2018
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As knowledge in biology and geology explodes, science becomes increasingly specialized. Given the overlap of the environmental sciences, however, the explosion in knowledge inevitably creates opportunities for interconnecting the biogeosciences. Here, 30 scientists emphasize the opportunities for biogeoscience collaborations across the world’s remarkable long-term environmental research networks that can advance science and engage larger scientific and public audiences.
Ivy Frenger, Matthias Münnich, and Nicolas Gruber
Biogeosciences, 15, 4781–4798, https://doi.org/10.5194/bg-15-4781-2018, https://doi.org/10.5194/bg-15-4781-2018, 2018
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Although mesoscale ocean eddies are ubiquitous in the Southern Ocean (SO), their regional and seasonal association with phytoplankton has not been quantified. We identify over 100 000 eddies and determine the associated phytoplankton biomass anomalies using satellite-based chlorophyll (Chl) as a proxy. The emerging Chl anomalies can be explained largely by lateral advection of Chl by eddies. This impact of eddies on phytoplankton may implicate downstream effects on SO biogeochemical properties.
Yi Sun, Xiong Z. He, Fujiang Hou, Zhaofeng Wang, and Shenghua Chang
Biogeosciences, 15, 4233–4243, https://doi.org/10.5194/bg-15-4233-2018, https://doi.org/10.5194/bg-15-4233-2018, 2018
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To investigate how grazing alters litter composition, quality and decomposition, we collected litter from grazing (GP) and grazing exclusion paddocks (GEP) and incubated them in situ and across sites. Grazing increased litter N and grazing exclusion increased litter mass of palatable species and promoted SOC. Litter decomposed faster in GP and N was opposite. Site environment had more impact on litter decomposition. Results may be helpful in developing strategies to restore degraded grasslands.
Louise Rousselet, Alain de Verneil, Andrea M. Doglioli, Anne A. Petrenko, Solange Duhamel, Christophe Maes, and Bruno Blanke
Biogeosciences, 15, 2411–2431, https://doi.org/10.5194/bg-15-2411-2018, https://doi.org/10.5194/bg-15-2411-2018, 2018
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The patterns of the large- and fine-scale surface circulation on biogeochemical and biological distributions are examined in the western tropical South Pacific (WTSP) in the context of the OUTPACE oceanographic cruise. The combined use of in situ and satellite data allows for the identification of water mass transport pathways and fine-scale structures, such as fronts, that drive surface distribution of tracers and microbial community structures.
Alain de Verneil, Louise Rousselet, Andrea M. Doglioli, Anne A. Petrenko, Christophe Maes, Pascale Bouruet-Aubertot, and Thierry Moutin
Biogeosciences, 15, 2125–2147, https://doi.org/10.5194/bg-15-2125-2018, https://doi.org/10.5194/bg-15-2125-2018, 2018
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Oceanographic campaigns to measure biogeochemical processes popularly deploy drifters with onboard incubations to stay in a single body of water. Here, we aggregate physical data taken during such a cruise, OUTPACE, to independently test in a new approach whether the drifter really stayed in what can be considered a single biological or chemical environment. This study concludes that future campaigns would benefit from similar data collection and analysis to validate their sampling strategy.
Susan L. Brantley, David M. Eissenstat, Jill A. Marshall, Sarah E. Godsey, Zsuzsanna Balogh-Brunstad, Diana L. Karwan, Shirley A. Papuga, Joshua Roering, Todd E. Dawson, Jaivime Evaristo, Oliver Chadwick, Jeffrey J. McDonnell, and Kathleen C. Weathers
Biogeosciences, 14, 5115–5142, https://doi.org/10.5194/bg-14-5115-2017, https://doi.org/10.5194/bg-14-5115-2017, 2017
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This review represents the outcome from an invigorating workshop discussion that involved tree physiologists, geomorphologists, ecologists, geochemists, and hydrologists and developed nine hypotheses that could be tested. We argue these hypotheses point to the essence of issues we must explore if we are to understand how the natural system of the earth surface evolves, and how humans will affect its evolution. This paper will create discussion and interest both before and after publication.
Johanne H. Rydsaa, Frode Stordal, Anders Bryn, and Lena M. Tallaksen
Biogeosciences, 14, 4209–4227, https://doi.org/10.5194/bg-14-4209-2017, https://doi.org/10.5194/bg-14-4209-2017, 2017
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We investigate the atmospheric sensitivity to an expansion in shrub and tree cover in the northern Fennoscandia region. We applied a regional weather and climate model in evaluating biophysical effects of increased shrub cover at a fine resolution. We find that shrub cover increase causes a warming that is sensitive to the shrub and tree heights. Cooling effects include increased snow cover, cloud cover, and precipitation. We show that the net warming will likely increase in the future.
Cited articles
Amato, P., Hennebelle, R., Magand, O., Sancelme, M., Delort, A.-M. M.,
Barbante, C., Boutron, C., and Ferrari, C.: Bacterial characterization of the
snow cover at Spitzberg, Svalbard, FEMS Microbiol. Ecol., 59, 255–264,
https://doi.org/10.1111/j.1574-6941.2006.00198.x, 2007.
Bhatia, M. P., Sharp, M. J., and Foght, J. M.: Distinct bacterial communities
exist beneath a high Arctic polythermal glacier, Appl. Environ. Microb.,
72, 5838–5845, https://doi.org/10.1128/AEM.00595-06, 2006.
Bottrell, S. H. and Tranter, M.: Sulphide oxidation under partially anoxic
conditions at the bed of the Haut Glacier d'Arolla, Switzerland, Hydrol.
Process., 16, 2363–2368, https://doi.org/10.1002/hyp.1012, 2002.
Boyd, E. S., Lange, R. K., Mitchell, A. C., Havig, J. R., Hamilton, T. L.,
Lafrenière, M. J., Shock, E. L., Peters, J. W. and Skidmore, M.:
Diversity, abundance, and potential activity of nitrifying and
nitrate-reducing microbial assemblages in a subglacial ecosystem, Appl.
Environ. Microb., 77, 4778–4787, https://doi.org/10.1128/AEM.00376-11, 2011.
Burgess, D. and Sharp, M. J.: Recent Changes in Areal Extent of the Devon
Ice Cap, Nunavut, Canada, Arct. Antarct. Alp. Res., 36, 261–271,
2004.
Burgess, D. O., Sharp, M. J., Mair, D. W. F., Dowdeswell, J. A., and Benham,
T. J.: Flow dynamics and iceberg calving rates of Devon Ice Cap, Nunavut,
Canada, J. Glaciol., 51, 219–230, https://doi.org/10.3189/172756505781829430,
2005.
Cameron, K. A., Hodson, A. J., and Osborn, A. M.: Carbon and nitrogen
biogeochemical cycling potentials of supraglacial cryoconite communities,
Polar Biol., 35, 1375–1393, https://doi.org/10.1007/s00300-012-1178-3, 2012.
Cameron, K. A., Stibal, M., Hawkings, J. R., Mikkelsen, A. B., Telling, J.
P., Kohler, T. J., Gözdereliler, E., Zarsky, J. D., Wadham, J., and
Jacobsen, C. S.: Meltwater export of prokaryotic cells from the Greenland
Ice Sheet, Environ. Microbiol., 19, 524–534, https://doi.org/10.1111/1462-2920.13483, 2016.
Caporaso, J. G., Kuczynski, J., Stombaugh, J., Bittinger, K., Bushman, F.
D., Costello, E. K., Fierer, N., Peña, A. G., Goodrich, J. K., Gordon,
J. I., Huttley, G. A., Kelley, S. T., Knights, D., Koenig, J. E., Ley, R. E.,
Lozupone, C. A., Mcdonald, D., Muegge, B. D., Pirrung, M., Reeder, J.,
Sevinsky, J. R., Turnbaugh, P. J., Walters, W. A., Widmann, J., Yatsunenko,
T., Zaneveld, J., and Knight, R.: correspondence QIIME allows analysis of
high- throughput community sequencing data Intensity normalization improves
color calling in SOLiD sequencing, Nat. Publ. Gr., 7, 335–336,
https://doi.org/10.1038/nmeth.f.303, 2010.
Chase, J. M. and Myers, J. A.: Disentangling the importance of ecological
niches from stochastic processes across scales, Philos. T. R. Soc. B, 366, 2351–2363, https://doi.org/10.1098/rstb.2011.0063, 2011.
Christner, B. C., Mosley-thompson, E., Thompson, L. G., and Reeve, J. N.:
Classification of Bacteria from Polar and Nonpolar Glacial Ice, in: Life in
Ancient Ice, 227–239, Princeton University Press, Princeton, NJ, USA,
2005.
Christner, B. C., Royston-Bishop, G., Foreman, C. M., Arnold, B. R.,
Tranter, M., Welch, K. A., Lyons, W. B., Tsapin, A. I., Studinger, M., and
Priscu, J. C.: Limnological conditions in Subglacial Lake Vostok,
Antarctica, Limnol. Oceanogr., 51, 2485–2501,
https://doi.org/10.4319/lo.2006.51.6.2485, 2006.
Coble, P. G.: Characterization of marine and terrestrial DOM in seawater
using excitiation-emission spectroscopy, Mar. Chem., 51, 325–346, 1996.
Coble, P. G.: Marine optical biogeochemistry: the chemistry of ocean color,
Chem. Rev., 107, 402–418, https://doi.org/10.1021/cr050350+, 2007.
Coble, P. G., Del Castillo, C. E., and Avril, B.: Distribution and optical
properties of CDOM in the Arabian Sea during the 1995 Southwest Monsoon,
Deep-Sea Res. Pt. II, 45, 2195–2223,
https://doi.org/10.1016/S0967-0645(98)00068-X, 1998.
Comte, J., Monier, A., Crevecoeur, S., Lovejoy, C., and Vincent, W. F.:
Microbial biogeography of permafrost thaw ponds across the changing northern
landscape, Ecography, 39, 609–618, https://doi.org/10.1111/ecog.01667, 2016.
Cory, R. M. and McKnight, D. M.: Fluorescence Spectroscopy Reveals
Ubiquitous Presence of Oxidized and Reduced Quinones in Dissolved Organic
Matter, Environ. Sci. Technol., 39, 8142–8149, https://doi.org/10.1021/es0506962,
2005.
Cuffey, K. M. and Paterson, W. S. B.: The Physics of Glaciers, 4th Edn., Butterworth-Heinemann/Elsevier, Burlington, MA, 2010.
Cuss, C. W. and Gueguen, C.: Relationships between molecular weight and
fluorescence properties for size-fractionated dissolved organic matter from
fresh and aged sources, Water Res., 68, 487–497,
https://doi.org/10.1016/j.watres.2014.10.013, 2015.
Dubnick, A., Kazemi, S., Sharp, M., Wadham, J., Hawkings, J., Beaton, A., and
Lanoil, B.: Hydrological controls on glacially exported microbial
assemblages, J. Geophys. Res.-Biogeo., 1–13,
https://doi.org/10.1002/2016JG003685, 2017.
Edgar, R. C.: UPARSE: Highly accurate OTU sequences from microbial amplicon
reads, Nat. Methods, 10, 996–998, https://doi.org/10.1038/nmeth.2604, 2013.
Elliott, S., Lead, J. R., and Baker, A.: Characterisation of the fluorescence
from freshwater, planktonic bacteria, Water Res., 40, 2075–2083,
https://doi.org/10.1016/j.watres.2006.03.017, 2006.
Fellman, J. B., D'Amore, D. V., Hood, E. W., and Boone, R. D.: Fluorescence
characteristics and biodegradability of dissolved organic matter in forest
and wetland soils from coastal temperate watersheds in southeast Alaska,
Biogeochemistry, 88, 169–184, https://doi.org/10.1007/s10533-008-9203-x, 2008.
Fitzsimons, S., Webb, N., Mager, S., MacDonell, S., Lorrain, R., and Samyn,
D.: Mechanisms of basal ice formation in polar glaciers: An evaluation of
the apron entrainment model, J. Geophys. Res.-Earth, 113, 1–10,
https://doi.org/10.1029/2006JF000698, 2008.
Fuhrman, J. A., Steele, J. A., Hewson, I., Schwalbach, M. S., Brown, M. V.,
Green, J. L., and Brown, J. H.: A latitudinal diversity gradient in
planktonic marine bacteria, P. Natl. Acad. Sci. USA, 105, 7774–7778,
https://doi.org/10.1073/pnas.0803070105, 2008.
Gilpin, R. R.: A model of the “liquid-like” layer between ice and a
substrate with applications to wire regelation and particle migration, J.
Colloid Interf. Sci., 68, 235–251, https://doi.org/10.1016/0021-9797(79)90277-7,
1979.
Gutiérrez, M., Galand, P., Moffat, C., and Pantoja, S.: Melting glacier
impacts the community structure of Bacteria, Fungi and Archaea in Chilean
Patagonia fjord system, Environ. Microbiol., 16, 11110515,
https://doi.org/10.1111/1462-2920.12872, 2015.
Harding, T., Jungblut, A. D., Lovejoy, C., and Vincent, W. F.: Microbes in
high arctic snow and implications for the cold biosphere, Appl. Environ.
Microb., 77, 3234–3243, https://doi.org/10.1128/AEM.02611-10, 2011.
Harrison, J. C., Lynds, T., Ford, A., and Rainbird, R. H.: Simplified
tectonic assemblage map of the Canadian Arctic Islands, Geol. Surv. Canada,
Can. Geosci. Map 80, scale 12 000 000, https://doi.org/10.4095/297416,
2016.
Hawkings, J. R., Wadham, J. L., Tranter, M., Raiswell, R., Benning, L. G.,
Statham, P. J., Tedstone, A., Nienow, P., Lee, K., and Telling, J. P.: Ice
sheets as a significant source of highly reactive nanoparticulate iron to
the oceans, Nat. Commun., 5, 1–8, https://doi.org/10.1038/ncomms4929, 2014.
Hodson, A. J.: Biogeochemistry of snowmelt in an Antarctic glacial
ecosystem, Water Resour. Res., 42, 1–15, https://doi.org/10.1029/2005WR004311,
2006a.
Hodson, A. J.: Phosphorus in Glacial Meltwaters, in: Glacier Science and Environmental Change, edited by: Knight, P. G., 81–82, Blackwell Science Ltd, Malden, MA, 2006b.
Holland, H. D.: The chemistry of atmospheres and oceans, Wiley-Interscience,
New York, 1978.
Honma, H.: High ammonium contents in the 3800 Ma Isua supracrustal rocks,
central West Greenland, Geochim. Cosmochim. Ac., 60, 2173–2178,
https://doi.org/10.1016/0016-7037(96)00083-X, 1996.
Honma, H. and Schwarcz, H. P.: Ammonium content of Archaean rocks of the
Superior Province, Therm. Spring Res., Okayama Univ., 49, 7–13, 1979.
Hubbard, B. and Sharp, M.: Basal ice formation and deformation: a review,
Prog. Phys. Geogr. Earth Environ., 13, 529–558,
https://doi.org/10.1177/030913338901300403, 1989.
Hubbard, B., Cook, S., and Coulson, H.: Basal ice facies: a review and
unifying approach, Quaternary Sci. Rev., 28, 1956–1969,
https://doi.org/10.1016/j.quascirev.2009.03.005, 2009.
Iken, A.: The effect of the subglacial water pressure on the sliding
velocity of a glacier in an idealized numerical model, J. Glaciol., 27,
407–421, 1981.
Iken, A. and Bindschadler, R. A.: Combined measurements of subglacial water pressure and surface velocity of Findelengletscher, Switzerland, J. Glaciol., 32, 101–119, 1986.
Iwamori, H., Yoshida, K., Nakamura, H., Kuwatani, T., Hamada, M., Haraguchi,
S., and Ueki, K.: Classification of geochemical data based onmultivariate
statistical analyses: Complementary roles of cluster, principal component,
and independent component analyses, Geochem. Geophy. Geosy., 18,
994–1012, https://doi.org/10.1002/2016GC006663, 2017.
Kastovská, K., Elster, J., Stibal, M., and Santrůcková, H.:
Microbial assemblages in soil microbial succession after glacial retreat in
Svalbard (high arctic), Microb. Ecol., 50, 396–407,
https://doi.org/10.1007/s00248-005-0246-4, 2005.
Kazemi, S., Hatam, I., and Lanoil, B.: Bacterial community succession in a
high-altitude subarctic glacier foreland is a three-stage process, Mol.
Ecol., 25, 5557–5567, https://doi.org/10.1111/mec.13835, 2016.
Knight, P. G.: The basal ice layer of glaciers and ice sheets, Quaternary Sci.
Rev., 16, 975–993, https://doi.org/10.1016/S0277-3791(97)00033-4, 1997.
Lakowicz, R. J.: Principles of Fluorescence Spectroscopy, 2nd Edn.,
Kluwer Academic/Plenum Publishers, New York, 1999.
Lanoil, B., Skidmore, M., Priscu, J. C., Han, S., Foo, W., Vogel, S. W.,
Tulaczyk, S., and Engelhardt, H.: Bacteria beneath the West Antarctic ice
sheet, Environ. Microbiol., 11, 609–615,
https://doi.org/10.1111/j.1462-2920.2008.01831.x, 2009.
Lapierre, J.-F. and del Giorgio, P. A.: Partial coupling and differential regulation of biologically and photochemically labile dissolved organic carbon across boreal aquatic networks, Biogeosciences, 11, 5969–5985, https://doi.org/10.5194/bg-11-5969-2014, 2014.
Lear, G., Bellamy, J., Case, B. S., Lee, J. E., and Buckley, H. L.:
Fine-scale spatial patterns in bacterial community composition and function
within freshwater ponds, ISME J., 8, 1715–1726,
https://doi.org/10.1038/ismej.2014.21, 2014.
Lorrain, R. D., Fitzsimons, S. J., Vandergoes, M. J., and Stievenard, M.: Ice
composition evidence for the formation of basal ice from lake water beneath
a cold-based Antarctic glacier, Ann. Glaciol., 28, 277–281, 1999.
Lynch, M. D. J., Masella, A. P., Hall, M. W., Bartram, A. K., and Neufeld, J.
D.: AXIOME: Automated exploration of microbial diversity, Gigascience, 2,
3–7, https://doi.org/10.1186/2047-217X-2-3, 2013.
Masella, A. P., Bartram, A. K., Truszkowski, J. M., Brown, D. G., and
Neufeld, J. D.: PANDAseq: Paired-end assembler for illumina sequences, BMC
Bioinformatics, 13, 1–7, https://doi.org/10.1186/1471-2105-13-31, 2012.
Mindl, B., Anesio, A. M., Meirer, K., Hodson, A. J., Laybourn-Parry, J.,
Sommaruga, R., and Sattler, B.: Factors influencing bacterial dynamics along
a transect from supraglacial runoff to proglacial lakes of a high Arctic
glacieri, FEMS Microbiol. Ecol., 59, 307–317,
https://doi.org/10.1111/j.1574-6941.2006.00262.x, 2007.
Møller, A. K., Søborg, D. A., Al-soud, W. A., and Sørensen, S. J.:
Bacterial community structure in High-Arctic snow and freshwater as revealed
by pyrosequencing of 16S rRNA genes and cultivation, Polar Res., 32, 8369,
https://doi.org/10.3402/polar.v32i0.17390, 2013.
Montross, S., Skidmore, M., Christner, B., Samyn, D., Tison, J.-L., Lorrain,
R., Doyle, S., and Fitzsimons, S.: Debris-Rich Basal Ice as a Microbial
Habitat, Taylor Glacier, Antarctica, Geomicrobiol. J., 31, 76–81,
https://doi.org/10.1080/01490451.2013.811316, 2014.
Mopper, K. and Schultz, C. A.: Fluorescence as a possible tool for studying
the nature and water column distribution of DOC components, Mar. Chem.,
41, 229–238, https://doi.org/10.1016/0304-4203(93)90124-7, 1993.
Murphy, K. R., Stedmon, C. A., Graeber, D., and Bro, R.: Fluorescence
spectroscopy and multi-way techniques. PARAFAC, Anal. Methods, 5, 6557,
https://doi.org/10.1039/c3ay41160e, 2013.
Murphy, K. R., Stedmon, C. A., Wenig, P., and Bro, R.: OpenFluor – an online
spectral library of auto-fluorescence by organic compounds in the
environment, Anal. Methods, 6, 658–661, https://doi.org/10.1039/C3AY41935E, 2014.
O'Dell, J. W.: Determination of Nitrate-Nitrite Nitrogen by Automated
Colorimetry, United States Environmental protection Agency, Cincinnati,
Ohio, 1993.
O'Donnell, E. C., Wadham, J. L., Lis, G. P., Tranter, M., Pickard, A. E., Stibal, M., Dewsbury, P., and Fitzsimons, S.: Identification and analysis of low-molecular-weight dissolved organic carbon in subglacial basal ice ecosystems by ion chromatography, Biogeosciences, 13, 3833–3846, https://doi.org/10.5194/bg-13-3833-2016, 2016.
Osburn, C. L., Boyd, T. J., Montgomery, M. T., Bianchi, T. S., Coffin, R. B.,
and Paerl, H. W.: Optical Proxies for Terrestrial Dissolved Organic Matter
in Estuaries and Coastal Waters, Front. Mar. Sci., 2, 127,
https://doi.org/10.3389/fmars.2015.00127, 2016.
Porder, S. and Ramachandran, S.: The phosphorus concentration of common
rocks-a potential driver of ecosystem P status, Plant Soil, 367,
41–55, https://doi.org/10.1007/s11104-012-1490-2, 2013.
Price, P. B. and Sowers, T.: Temperature dependence of metabolic rates for
microbial growth , maintenance, and survival, P. Natl. Acad. Sci. USA,
101, 4631–4636, 2004.
Raiswell, R.: Chemical models of solute acquisition in glacial melt waters,
J. Glaciol., 30, 49–57, 1984.
Rice, E. W., Baird, R. B., Eaton, A. D., and Clesceri, L. S. (Eds.): Standard
methods for the examination of water and wastewater, 22nd Edn., American
Public Health Association, American Water Works Association, Water
Environment Federation, Washington, DC, 2012.
Rondón, J., Gómez, W., Ball, M. M., Melfo, A., Rengifo, M.,
Balcazar, W., Dávila-Vera, D., Balza-Quintero, A., Mendoza-Briceño,
R. V., and Yarzábal, L. A.: Diversity of culturable bacteria recovered
from Pico Bolívar's glacial and subglacial environments,
at 4,950 m, in Venezuelan Tropical Andes, Can. J. Microbiol., 62,
904–917, https://doi.org/10.1139/cjm-2016-0172, 2016.
Sattin, S. R., Cleveland, C. C., Hood, E., Reed, S. C., King, A. J.,
Schmidt, S. K., Robeson, M. S., Ascarrunz, N., and Nemergut, D. R.:
Functional shifts in unvegetated, perhumid, recently-deglaciated soils do
not correlate with shifts in soil bacterial community composition, J.
Microbiol., 47, 673–681, https://doi.org/10.1007/s12275-009-0194-7, 2010.
Sharp, M., Burgess, D. O., Cogley, J. G., Ecclestone, M., Labine, C., and
Wolken, G. J.: Extreme melt on Canada's Arctic ice caps in the 21st century,
Geophys. Res. Lett., 38, 3–7, https://doi.org/10.1029/2011GL047381, 2011.
Sharp, M. J., Parkes, J., Cragg, B., Fairchild, I. J., Lamb, H., and Tranter,
M.: Widespread bacterial populations at glacier beds and their relationship
to rock weathering and carbon cycling, Geology, 27, 107–110,
https://doi.org/10.1130/0091-7613(1999)027<0107:WBPAGB>2.3.CO;2,
1999.
Shaw, J.: Till body morphology and structure related, Boreas, 6, 189–201,
1977.
Sheik, C. S., Stevenson, E. I., Den Uyl, P. A., Arendt, C. A., Aciego, S. M.,
and Dick, G. J.: Microbial communities of the Lemon Creek Glacier show
subtle structural variation yet stable phylogenetic composition over space
and time, Front. Microbiol., 6, 495,
https://doi.org/10.3389/fmicb.2015.00495, 2015.
Shrivastava, A. and Gupta, V. B.: Methods for the determination of limit of
detection and limit of quantitation of the analytical methods, Chronicles
Young Sci., 2, 21–25, https://doi.org/10.4103/2229-5186.79345, 2011.
Skidmore, M., Anderson, S. P., Sharp, M. J., Foght, J. M., and Lanoil, B.:
Comparison of microbial community compositions of two subglacial
environments reveals a possible role for microbes in chemical weathering
processes, Appl. Environ. Microb., 71, 6986–6997,
https://doi.org/10.1128/AEM.71.11.6986-6997.2005, 2005.
Smith, H. J., Foster, R. A., McKnight, D. M., Lisle, J. T., Littmann, S.,
Kuypers, M. M. M., and Foreman, C. M.: Microbial formation of labile organic
carbon in Antarctic glacial environments, Nat. Geosci., 10, 356–359,
https://doi.org/10.1038/ngeo2925, 2017.
Statham, P. J., Skidmore, M., and Tranter, M.: Inputs of glacially derived
dissolved and colloidal iron to the coastal ocean and implications for
primary productivity, Global Biogeochem. Cy., 22, GB3013,
https://doi.org/10.1029/2007GB003106, 2008.
Stedmon, C. A. and Markager, S.: Tracing the production and degradation of
autochthonous fractions of dissolved organic matter using fluorescence
analysis, Limnol. Oceanogr., 50, 1415–1426,
https://doi.org/10.4319/lo.2005.50.5.1415, 2005.
Stedmon, C. A., Markager, S., and Bro, R.: Tracing dissolved organic matter
in aquatic environments using a new approach to fluorescence spectroscopy,
Mar. Chem., 82, 239–254, https://doi.org/10.1016/S0304-4203(03)00072-0, 2003.
Stibal, M., Wadham, J. L., Lis, G. P., Telling, J. P., Pancost, R. D.,
Dubnick, A., Sharp, M. J., Lawson, E. C., Butler, C. E. H., Hasan, F.,
Tranter, M., and Anesio, A. M.: Methanogenic potential of Arctic and
Antarctic subglacial environments with contrasting organic carbon sources,
Glob. Change Biol., 18, 3332–3345,
https://doi.org/10.1111/j.1365-2486.2012.02763.x, 2012a.
Stibal, M., Hasan, F., Wadham, J., Sharp, M. J., and Anesio, A. M.:
Prokaryotic diversity in sediments beneath two polar glaciers with
contrasting organic carbon substrates, Extremophiles, 16, 255–265,
https://doi.org/10.1007/s00792-011-0426-8, 2012b.
Taylor, S. R. and McClennan, M. S.: The Continental Crust: its composition
and evolution, Blackwell Scientific Publications, Oxford, 1985.
Tranter, M.: Glacial Chemical Weathering, Runoff Composition and Solute Fluxes, in: Glacier Science and Environmental Change, 71–75, Blackwell Science Ltd, Malden, MA, 2006.
Tranter, M., Brown, G. H., Hodson, A. J., and Gurnell, A. M.: Hydrochemistry
as an indicator of subglacial drainage system structure: A comparison of
alpine and sub-polar environments, Hydrologica, 10, 541–556,
1996.
Tranter, M., Sharp, M. J., Lamb, H. R., Brown, G. H., Hubbard, B. P., and
Willis, I. C.: Geochemical weathering at the bed of Haut Glacier d'Arolla,
Switzerland – a new model, Hydrol. Process., 16, 959–993,
https://doi.org/10.1002/hyp.309, 2002.
Tuorto, S. J., Darias, P., Mcguinness, L. R., Panikov, N., and Zhang, T.:
Bacterial genome replication at subzero temperatures in permafrost, ISME J.,
8, 139–149, https://doi.org/10.1038/ismej.2013.140, 2014.
Van Wychen, W., Davis, J., Copland, L., Burgess, D. O., Gray, L., Sharp, M.,
Dowdeswell, J. A., and Benham, T. J.: Variability in ice motion and dynamic
discharge from Devon Ice Cap, Nunavut, Canada, J. Glaciol., 63,
436–449, https://doi.org/10.1017/jog.2017.2, 2017.
Vellend, M. and Agrawal, A.: Conceptual Synthesis in Community Ecology, Q.
Rev. Biol., 85, 183–206, https://doi.org/10.1086/652373, 2010.
Wadham, J., Arndt, S., Tulaczyk, S., Stibal, M., Tranter, M., Telling, J.
P., Lis, G. P., Lawson, E. C., Ridgwell, A., Dubnick, A., Sharp, M. J.,
Anesio, A. M., and Butler, C. E. H.: Potential methane reservoirs beneath
Antarctica, Nature, 488, 633–637, https://doi.org/10.1038/nature11374, 2012.
Wadham, J. L., Bottrell, S. H., Tranter, M., and Raiswell, R.: Stable isotope
evidence for microbial sulphate reduction at the bed of a polythermal high
Arctic glacier, Earth Planet. Sc. Lett., 219, 341–355,
https://doi.org/10.1016/S0012-821X(03)00683-6, 2004.
Wadham, J. L., Hawkings, J., Telling, J., Chandler, D., Alcock, J., O'Donnell, E., Kaur, P., Bagshaw, E., Tranter, M., Tedstone, A., and Nienow, P.: Sources, cycling and export of nitrogen on the Greenland Ice Sheet, Biogeosciences, 13, 6339–6352, https://doi.org/10.5194/bg-13-6339-2016, 2016.
Walder, B. J. S.: Motion of sub-freezing ice past particles, with
applications to wire regelation and frozen soils, J. Glaciol., 32,
1986.
Wang, Q., Garrity, G. M., Tiedje, J. M., and Cole, J. R.: Naïve Bayesian
classifier for rapid assignment of rRNA sequences into the new bacterial
taxonomy, Appl. Environ. Microb., 73, 5261–5267,
https://doi.org/10.1128/AEM.00062-07, 2007.
Wettlaufer, J. S., Worster, M. G., Wilen, L. A., and Dash, J. G.: A Theory of
Premelting Dynamics for all Power Law Forces, Phys. Rev. Lett., 76,
3602–3605, https://doi.org/10.1103/PhysRevLett.76.3602, 1996.
Yamashita, Y. and Tanoue, E.: Chemical characterization of protein-like
fluorophores in DOM in relation to aromatic amino acids, Mar. Chem.,
82, 255–271, https://doi.org/10.1016/S0304-4203(03)00073-2, 2003.
Yde, J. C., Finster, K. W., Raiswell, R., Steffensen, J. P., Heinemeier, J.,
Olsen, J., Gunnlaugsson, H. P., and Nielsen, O. B.: Basal ice microbiology at
the margin of the Greenland Ice Sheet, Ann. Glaciol., 51, 71–79,
https://doi.org/10.3189/172756411795931976, 2010.
Yergeau, E., Newsham, K. K., Pearce, D. A., and Kowalchuk, G. A.: Patterns of
bacterial diversity across a range of Antarctic terrestrial habitats,
Environ. Microbiol., 9, 2670–2682,
https://doi.org/10.1111/j.1462-2920.2007.01379.x, 2007.
Zarsky, J. D., Kohler, T. J., Yde, J. C., Lamarche-gagnon, G., Hawkings, J.
R., Hatton, J. E., and Stibal, M.: Prokaryotic assemblages in suspended and
subglacial sediments within a glacierized catchment on Qeqertarsuaq (Disko
Island), west Greenland, FEMS Microbiol. Ecol., 94, fiy100,
https://doi.org/10.1093/femsec/fiy100, 2018.
Short summary
We found that glaciers with basal temperatures near the melting point mobilize more solutes, nutrients, and microbes from the underlying substrate and are more likely to promote in situ biogeochemical activity than glaciers with basal temperatures well below the melting point. The temperature at the base of glaciers is therefore an important control on the biogeochemistry of ice near glacier beds, and, ultimately, the potential solutes, nutrients, and microbes exported from glaciated watersheds.
We found that glaciers with basal temperatures near the melting point mobilize more solutes,...
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