Seasonal Water Mass Evolution and Non‐Redfield Dynamics Enhance CO(2) Uptake in the Chukchi Sea
The Chukchi Sea is an increasing CO(2) sink driven by rapid climate changes. Understanding the seasonal variation of air‐sea CO(2) exchange and the underlying mechanisms of biogeochemical dynamics is important for predicting impacts of climate change on and feedbacks by the ocean. Here, we present a...
Published in: | Journal of Geophysical Research: Oceans |
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ftpubmed:oai:pubmedcentral.nih.gov:9787980 2023-05-15T15:54:27+02:00 Seasonal Water Mass Evolution and Non‐Redfield Dynamics Enhance CO(2) Uptake in the Chukchi Sea Ouyang, Zhangxian Collins, Andrew Li, Yun Qi, Di Arrigo, Kevin R. Zhuang, Yanpei Nishino, Shigeto Humphreys, Matthew P. Kosugi, Naohiro Murata, Akihiko Kirchman, David L. Chen, Liqi Chen, Jianfang Cai, Wei‐Jun 2022-08-04 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9787980/ https://doi.org/10.1029/2021JC018326 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9787980/ http://dx.doi.org/10.1029/2021JC018326 © 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY J Geophys Res Oceans Research Article Text 2022 ftpubmed https://doi.org/10.1029/2021JC018326 2023-01-01T01:34:35Z The Chukchi Sea is an increasing CO(2) sink driven by rapid climate changes. Understanding the seasonal variation of air‐sea CO(2) exchange and the underlying mechanisms of biogeochemical dynamics is important for predicting impacts of climate change on and feedbacks by the ocean. Here, we present a unique data set of underway sea surface partial pressure of CO(2) (pCO(2)) and discrete samples of biogeochemical properties collected in five consecutive cruises in 2014 and examine the seasonal variations in air‐sea CO(2) flux and net community production (NCP). We found that thermal and non‐thermal effects have different impacts on sea surface pCO(2) and thus the air‐sea CO(2) flux in different water masses. The Bering summer water combined with meltwater has a significantly greater atmospheric CO(2) uptake potential than that of the Alaskan Coastal Water in the southern Chukchi Sea in summer, due to stronger biological CO(2) removal and a weaker thermal effect. By analyzing the seasonal drawdown of dissolved inorganic carbon (DIC) and nutrients, we found that DIC‐based NCP was higher than nitrate‐based NCP by 66%–84% and attributable to partially decoupled C and N uptake because of a variable phytoplankton stoichiometry. A box model with a non‐Redfield C:N uptake ratio can adequately reproduce observed pCO(2) and DIC, which reveals that, during the intensive growing season (late spring to early summer), 30%–46% CO(2) uptake in the Chukchi Sea was supported by a flexible stoichiometry of phytoplankton. These findings have important ramification for forecasting the responses of CO(2) uptake of the Chukchi ecosystem to climate change. Text Chukchi Chukchi Sea PubMed Central (PMC) Chukchi Sea Journal of Geophysical Research: Oceans 127 8 |
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PubMed Central (PMC) |
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English |
topic |
Research Article |
spellingShingle |
Research Article Ouyang, Zhangxian Collins, Andrew Li, Yun Qi, Di Arrigo, Kevin R. Zhuang, Yanpei Nishino, Shigeto Humphreys, Matthew P. Kosugi, Naohiro Murata, Akihiko Kirchman, David L. Chen, Liqi Chen, Jianfang Cai, Wei‐Jun Seasonal Water Mass Evolution and Non‐Redfield Dynamics Enhance CO(2) Uptake in the Chukchi Sea |
topic_facet |
Research Article |
description |
The Chukchi Sea is an increasing CO(2) sink driven by rapid climate changes. Understanding the seasonal variation of air‐sea CO(2) exchange and the underlying mechanisms of biogeochemical dynamics is important for predicting impacts of climate change on and feedbacks by the ocean. Here, we present a unique data set of underway sea surface partial pressure of CO(2) (pCO(2)) and discrete samples of biogeochemical properties collected in five consecutive cruises in 2014 and examine the seasonal variations in air‐sea CO(2) flux and net community production (NCP). We found that thermal and non‐thermal effects have different impacts on sea surface pCO(2) and thus the air‐sea CO(2) flux in different water masses. The Bering summer water combined with meltwater has a significantly greater atmospheric CO(2) uptake potential than that of the Alaskan Coastal Water in the southern Chukchi Sea in summer, due to stronger biological CO(2) removal and a weaker thermal effect. By analyzing the seasonal drawdown of dissolved inorganic carbon (DIC) and nutrients, we found that DIC‐based NCP was higher than nitrate‐based NCP by 66%–84% and attributable to partially decoupled C and N uptake because of a variable phytoplankton stoichiometry. A box model with a non‐Redfield C:N uptake ratio can adequately reproduce observed pCO(2) and DIC, which reveals that, during the intensive growing season (late spring to early summer), 30%–46% CO(2) uptake in the Chukchi Sea was supported by a flexible stoichiometry of phytoplankton. These findings have important ramification for forecasting the responses of CO(2) uptake of the Chukchi ecosystem to climate change. |
format |
Text |
author |
Ouyang, Zhangxian Collins, Andrew Li, Yun Qi, Di Arrigo, Kevin R. Zhuang, Yanpei Nishino, Shigeto Humphreys, Matthew P. Kosugi, Naohiro Murata, Akihiko Kirchman, David L. Chen, Liqi Chen, Jianfang Cai, Wei‐Jun |
author_facet |
Ouyang, Zhangxian Collins, Andrew Li, Yun Qi, Di Arrigo, Kevin R. Zhuang, Yanpei Nishino, Shigeto Humphreys, Matthew P. Kosugi, Naohiro Murata, Akihiko Kirchman, David L. Chen, Liqi Chen, Jianfang Cai, Wei‐Jun |
author_sort |
Ouyang, Zhangxian |
title |
Seasonal Water Mass Evolution and Non‐Redfield Dynamics Enhance CO(2) Uptake in the Chukchi Sea |
title_short |
Seasonal Water Mass Evolution and Non‐Redfield Dynamics Enhance CO(2) Uptake in the Chukchi Sea |
title_full |
Seasonal Water Mass Evolution and Non‐Redfield Dynamics Enhance CO(2) Uptake in the Chukchi Sea |
title_fullStr |
Seasonal Water Mass Evolution and Non‐Redfield Dynamics Enhance CO(2) Uptake in the Chukchi Sea |
title_full_unstemmed |
Seasonal Water Mass Evolution and Non‐Redfield Dynamics Enhance CO(2) Uptake in the Chukchi Sea |
title_sort |
seasonal water mass evolution and non‐redfield dynamics enhance co(2) uptake in the chukchi sea |
publisher |
John Wiley and Sons Inc. |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9787980/ https://doi.org/10.1029/2021JC018326 |
geographic |
Chukchi Sea |
geographic_facet |
Chukchi Sea |
genre |
Chukchi Chukchi Sea |
genre_facet |
Chukchi Chukchi Sea |
op_source |
J Geophys Res Oceans |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9787980/ http://dx.doi.org/10.1029/2021JC018326 |
op_rights |
© 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2021JC018326 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
8 |
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1766389639400128512 |