Winter-to-summer evolution of p CO 2 in surface water and air–sea CO 2 flux in the seasonal ice zone of the Southern Ocean
Partial pressure of CO 2 ( p CO 2 ) in surface water and vertical profiles of the carbonate system parameters were measured during austral summer in the Indian sector of the Southern Ocean (64–67° S, 32–58° E) in January 2006 to understand the CO 2 dynamics of seawater in the seasonal ice zone. Surf...
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ftdoajarticles:oai:doaj.org/article:315ed3b3d62c4a589b6a076b0c5b0680 2023-05-15T18:17:27+02:00 Winter-to-summer evolution of p CO 2 in surface water and air–sea CO 2 flux in the seasonal ice zone of the Southern Ocean D. Nomura H. Yoshikawa-Inoue S. Kobayashi S. Nakaoka K. Nakata G. Hashida 2014-10-01T00:00:00Z https://doi.org/10.5194/bg-11-5749-2014 https://doaj.org/article/315ed3b3d62c4a589b6a076b0c5b0680 EN eng Copernicus Publications http://www.biogeosciences.net/11/5749/2014/bg-11-5749-2014.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-11-5749-2014 https://doaj.org/article/315ed3b3d62c4a589b6a076b0c5b0680 Biogeosciences, Vol 11, Iss 20, Pp 5749-5761 (2014) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/bg-11-5749-2014 2022-12-31T05:31:43Z Partial pressure of CO 2 ( p CO 2 ) in surface water and vertical profiles of the carbonate system parameters were measured during austral summer in the Indian sector of the Southern Ocean (64–67° S, 32–58° E) in January 2006 to understand the CO 2 dynamics of seawater in the seasonal ice zone. Surface-water p CO 2 ranged from 275 to 400 μatm, and longitudinal variations reflected the dominant influence of water temperature and dilution by sea ice meltwater between 32 and 40° E and biological productivity between 40 and 58° E. Using carbonate system data from the temperature minimum layer (−1.9 °C < T < −1.5 °C, 34.2 < S < 34.5), we examined the winter-to-summer evolution of surface-water p CO 2 and the factors affecting it. Our results indicate that p CO 2 increased by as much as 32 μatm, resulting mainly from the increase in water temperature. At the same time as changes in sea ice concentration and surface-water p CO 2 , the air–sea CO 2 flux, which consists of the exchange of CO 2 between sea ice and atmosphere, changed from −1.1 to +0.9 mmol C m −2 day −1 between winter and summer. These results suggest that, for the atmosphere, the seasonal ice zone acts as a CO 2 sink in winter and a temporary CO 2 source in summer immediately after the retreat of sea ice. Subsequent biological productivity likely decreases surface-water p CO 2 and the air–sea CO 2 flux becomes negative, such that in summer the study area is again a CO 2 sink with respect to the atmosphere. Article in Journal/Newspaper Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Austral Indian Biogeosciences 11 20 5749 5761 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 D. Nomura H. Yoshikawa-Inoue S. Kobayashi S. Nakaoka K. Nakata G. Hashida Winter-to-summer evolution of p CO 2 in surface water and air–sea CO 2 flux in the seasonal ice zone of the Southern Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Partial pressure of CO 2 ( p CO 2 ) in surface water and vertical profiles of the carbonate system parameters were measured during austral summer in the Indian sector of the Southern Ocean (64–67° S, 32–58° E) in January 2006 to understand the CO 2 dynamics of seawater in the seasonal ice zone. Surface-water p CO 2 ranged from 275 to 400 μatm, and longitudinal variations reflected the dominant influence of water temperature and dilution by sea ice meltwater between 32 and 40° E and biological productivity between 40 and 58° E. Using carbonate system data from the temperature minimum layer (−1.9 °C < T < −1.5 °C, 34.2 < S < 34.5), we examined the winter-to-summer evolution of surface-water p CO 2 and the factors affecting it. Our results indicate that p CO 2 increased by as much as 32 μatm, resulting mainly from the increase in water temperature. At the same time as changes in sea ice concentration and surface-water p CO 2 , the air–sea CO 2 flux, which consists of the exchange of CO 2 between sea ice and atmosphere, changed from −1.1 to +0.9 mmol C m −2 day −1 between winter and summer. These results suggest that, for the atmosphere, the seasonal ice zone acts as a CO 2 sink in winter and a temporary CO 2 source in summer immediately after the retreat of sea ice. Subsequent biological productivity likely decreases surface-water p CO 2 and the air–sea CO 2 flux becomes negative, such that in summer the study area is again a CO 2 sink with respect to the atmosphere. |
format |
Article in Journal/Newspaper |
author |
D. Nomura H. Yoshikawa-Inoue S. Kobayashi S. Nakaoka K. Nakata G. Hashida |
author_facet |
D. Nomura H. Yoshikawa-Inoue S. Kobayashi S. Nakaoka K. Nakata G. Hashida |
author_sort |
D. Nomura |
title |
Winter-to-summer evolution of p CO 2 in surface water and air–sea CO 2 flux in the seasonal ice zone of the Southern Ocean |
title_short |
Winter-to-summer evolution of p CO 2 in surface water and air–sea CO 2 flux in the seasonal ice zone of the Southern Ocean |
title_full |
Winter-to-summer evolution of p CO 2 in surface water and air–sea CO 2 flux in the seasonal ice zone of the Southern Ocean |
title_fullStr |
Winter-to-summer evolution of p CO 2 in surface water and air–sea CO 2 flux in the seasonal ice zone of the Southern Ocean |
title_full_unstemmed |
Winter-to-summer evolution of p CO 2 in surface water and air–sea CO 2 flux in the seasonal ice zone of the Southern Ocean |
title_sort |
winter-to-summer evolution of p co 2 in surface water and air–sea co 2 flux in the seasonal ice zone of the southern ocean |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/bg-11-5749-2014 https://doaj.org/article/315ed3b3d62c4a589b6a076b0c5b0680 |
geographic |
Southern Ocean Austral Indian |
geographic_facet |
Southern Ocean Austral Indian |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
Biogeosciences, Vol 11, Iss 20, Pp 5749-5761 (2014) |
op_relation |
http://www.biogeosciences.net/11/5749/2014/bg-11-5749-2014.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-11-5749-2014 https://doaj.org/article/315ed3b3d62c4a589b6a076b0c5b0680 |
op_doi |
https://doi.org/10.5194/bg-11-5749-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
20 |
container_start_page |
5749 |
op_container_end_page |
5761 |
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1766191678257889280 |