Vertical stratification and stability of biogeochemical processes in the deep saline waters of Lake Vanda, Antarctica
Abstract Lake Vanda is a permanently ice‐covered lake in the McMurdo Dry Valleys of Antarctica. Its bottom waters remain stratified year‐round because of a strong salinity‐driven density gradient. We have assessed spatial patterns in and relationships between major biogeochemical processes in the wa...
Published in: | Limnology and Oceanography |
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crwiley:10.1002/lno.11327 2024-09-15T17:45:59+00:00 Vertical stratification and stability of biogeochemical processes in the deep saline waters of Lake Vanda, Antarctica Schutte, Charles A. Samarkin, Vladimir A. Peters, Brian Madigan, Michael T. Bowles, Marshall Morgan‐Kiss, Rachael Casciotti, Karen Joye, Samantha National Aeronautics and Space Administration National Science Foundation 2019 http://dx.doi.org/10.1002/lno.11327 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11327 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11327 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11327 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.11327 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11327 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 65, issue 3, page 569-581 ISSN 0024-3590 1939-5590 journal-article 2019 crwiley https://doi.org/10.1002/lno.11327 2024-06-27T04:21:09Z Abstract Lake Vanda is a permanently ice‐covered lake in the McMurdo Dry Valleys of Antarctica. Its bottom waters remain stratified year‐round because of a strong salinity‐driven density gradient. We have assessed spatial patterns in and relationships between major biogeochemical processes in the water column of Lake Vanda. Samples were collected in the austral summers of 2008 and 2011 to measure concentrations of metabolites associated with a suite of biogeochemical processes across the deep salinity gradient. The shapes of the resulting geochemical profiles were consistent between 2008 and 2011. Metabolite production and consumption rates were estimated using a reactive transport model based on the assumption that vertical diffusion was the only active physical transport process. We validated this model for nitrification by using stable isotope incubations to show that this process was only active at depths predicted by the model. No nitrification activity was observed at 68 m depth in spite of overlapping oxygen and ammonium gradients. We attribute this lack of activity to the competitive inhibition of ammonia monooxygenase by methane. Net nitrous oxide and nitrate consumption were observed in the oxic water column, providing evidence of aerobic denitrification. The depth of maximum net oxygen production did not coincide with the deep chlorophyll maxima (at 59.3, 63, and 68.2 m) measured in the same profile. Finally, the integrated sulfide oxidation rate was high compared with other oxidation processes, indicating that sulfide was an important electron donor for the water column microbial community. Article in Journal/Newspaper Antarc* Antarctica McMurdo Dry Valleys Wiley Online Library Limnology and Oceanography 65 3 569 581 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Lake Vanda is a permanently ice‐covered lake in the McMurdo Dry Valleys of Antarctica. Its bottom waters remain stratified year‐round because of a strong salinity‐driven density gradient. We have assessed spatial patterns in and relationships between major biogeochemical processes in the water column of Lake Vanda. Samples were collected in the austral summers of 2008 and 2011 to measure concentrations of metabolites associated with a suite of biogeochemical processes across the deep salinity gradient. The shapes of the resulting geochemical profiles were consistent between 2008 and 2011. Metabolite production and consumption rates were estimated using a reactive transport model based on the assumption that vertical diffusion was the only active physical transport process. We validated this model for nitrification by using stable isotope incubations to show that this process was only active at depths predicted by the model. No nitrification activity was observed at 68 m depth in spite of overlapping oxygen and ammonium gradients. We attribute this lack of activity to the competitive inhibition of ammonia monooxygenase by methane. Net nitrous oxide and nitrate consumption were observed in the oxic water column, providing evidence of aerobic denitrification. The depth of maximum net oxygen production did not coincide with the deep chlorophyll maxima (at 59.3, 63, and 68.2 m) measured in the same profile. Finally, the integrated sulfide oxidation rate was high compared with other oxidation processes, indicating that sulfide was an important electron donor for the water column microbial community. |
author2 |
National Aeronautics and Space Administration National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Schutte, Charles A. Samarkin, Vladimir A. Peters, Brian Madigan, Michael T. Bowles, Marshall Morgan‐Kiss, Rachael Casciotti, Karen Joye, Samantha |
spellingShingle |
Schutte, Charles A. Samarkin, Vladimir A. Peters, Brian Madigan, Michael T. Bowles, Marshall Morgan‐Kiss, Rachael Casciotti, Karen Joye, Samantha Vertical stratification and stability of biogeochemical processes in the deep saline waters of Lake Vanda, Antarctica |
author_facet |
Schutte, Charles A. Samarkin, Vladimir A. Peters, Brian Madigan, Michael T. Bowles, Marshall Morgan‐Kiss, Rachael Casciotti, Karen Joye, Samantha |
author_sort |
Schutte, Charles A. |
title |
Vertical stratification and stability of biogeochemical processes in the deep saline waters of Lake Vanda, Antarctica |
title_short |
Vertical stratification and stability of biogeochemical processes in the deep saline waters of Lake Vanda, Antarctica |
title_full |
Vertical stratification and stability of biogeochemical processes in the deep saline waters of Lake Vanda, Antarctica |
title_fullStr |
Vertical stratification and stability of biogeochemical processes in the deep saline waters of Lake Vanda, Antarctica |
title_full_unstemmed |
Vertical stratification and stability of biogeochemical processes in the deep saline waters of Lake Vanda, Antarctica |
title_sort |
vertical stratification and stability of biogeochemical processes in the deep saline waters of lake vanda, antarctica |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1002/lno.11327 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11327 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11327 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11327 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.11327 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11327 |
genre |
Antarc* Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys |
op_source |
Limnology and Oceanography volume 65, issue 3, page 569-581 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.11327 |
container_title |
Limnology and Oceanography |
container_volume |
65 |
container_issue |
3 |
container_start_page |
569 |
op_container_end_page |
581 |
_version_ |
1810493927025803264 |