Arctic Ocean CO2 uptake: An improved multiyear estimate of the air-sea CO2 flux incorporating chlorophyll a concentrations
We estimated monthly air–sea CO2 fluxes in the Arctic Ocean and its adjacent seas north of 60∘ N from 1997 to 2014. This was done by mapping partial pressure of CO2 in the surface water (pCO2w) using a self-organizing map (SOM) technique incorporating chlorophyll a concentration (Chl a), sea surface...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hdl.handle.net/1956/19045 https://doi.org/10.5194/bg-15-1643-2018 |
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ftunivbergen:oai:bora.uib.no:1956/19045 2023-05-15T14:51:42+02:00 Arctic Ocean CO2 uptake: An improved multiyear estimate of the air-sea CO2 flux incorporating chlorophyll a concentrations Yasunaka, Sayaka Siswanto, Eko Olsen, Are Hoppema, Mario Watanabe, Eiji Fransson, Agneta Ingrid Chierici, Melissa Murata, Akihiko Lauvset, Siv Kari Wanninkhof, Rik Takahashi, Taro Kosugi, Naohiro Omar, Abdirahman van Heuven, Steven Mathis, Jeremy T. 2018-08-24T08:33:30Z application/pdf https://hdl.handle.net/1956/19045 https://doi.org/10.5194/bg-15-1643-2018 eng eng EGU urn:issn:1726-4170 urn:issn:1726-4189 https://hdl.handle.net/1956/19045 https://doi.org/10.5194/bg-15-1643-2018 cristin:1592041 Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright The Author(s) 2018 Biogeosciences Peer reviewed Journal article 2018 ftunivbergen https://doi.org/10.5194/bg-15-1643-2018 2023-03-14T17:42:27Z We estimated monthly air–sea CO2 fluxes in the Arctic Ocean and its adjacent seas north of 60∘ N from 1997 to 2014. This was done by mapping partial pressure of CO2 in the surface water (pCO2w) using a self-organizing map (SOM) technique incorporating chlorophyll a concentration (Chl a), sea surface temperature, sea surface salinity, sea ice concentration, atmospheric CO2 mixing ratio, and geographical position. We applied new algorithms for extracting Chl a from satellite remote sensing reflectance with close examination of uncertainty of the obtained Chl a values. The overall relationship between pCO2w and Chl a was negative, whereas the relationship varied among seasons and regions. The addition of Chl a as a parameter in the SOM process enabled us to improve the estimate of pCO2w, particularly via better representation of its decline in spring, which resulted from biologically mediated pCO2w reduction. As a result of the inclusion of Chl a, the uncertainty in the CO2 flux estimate was reduced, with a net annual Arctic Ocean CO2 uptake of 180 ± 130 Tg C yr−1. Seasonal to interannual variation in the CO2 influx was also calculated. publishedVersion Article in Journal/Newspaper Arctic Arctic Ocean Sea ice University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Arctic Ocean Biogeosciences 15 6 1643 1661 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
We estimated monthly air–sea CO2 fluxes in the Arctic Ocean and its adjacent seas north of 60∘ N from 1997 to 2014. This was done by mapping partial pressure of CO2 in the surface water (pCO2w) using a self-organizing map (SOM) technique incorporating chlorophyll a concentration (Chl a), sea surface temperature, sea surface salinity, sea ice concentration, atmospheric CO2 mixing ratio, and geographical position. We applied new algorithms for extracting Chl a from satellite remote sensing reflectance with close examination of uncertainty of the obtained Chl a values. The overall relationship between pCO2w and Chl a was negative, whereas the relationship varied among seasons and regions. The addition of Chl a as a parameter in the SOM process enabled us to improve the estimate of pCO2w, particularly via better representation of its decline in spring, which resulted from biologically mediated pCO2w reduction. As a result of the inclusion of Chl a, the uncertainty in the CO2 flux estimate was reduced, with a net annual Arctic Ocean CO2 uptake of 180 ± 130 Tg C yr−1. Seasonal to interannual variation in the CO2 influx was also calculated. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Yasunaka, Sayaka Siswanto, Eko Olsen, Are Hoppema, Mario Watanabe, Eiji Fransson, Agneta Ingrid Chierici, Melissa Murata, Akihiko Lauvset, Siv Kari Wanninkhof, Rik Takahashi, Taro Kosugi, Naohiro Omar, Abdirahman van Heuven, Steven Mathis, Jeremy T. |
spellingShingle |
Yasunaka, Sayaka Siswanto, Eko Olsen, Are Hoppema, Mario Watanabe, Eiji Fransson, Agneta Ingrid Chierici, Melissa Murata, Akihiko Lauvset, Siv Kari Wanninkhof, Rik Takahashi, Taro Kosugi, Naohiro Omar, Abdirahman van Heuven, Steven Mathis, Jeremy T. Arctic Ocean CO2 uptake: An improved multiyear estimate of the air-sea CO2 flux incorporating chlorophyll a concentrations |
author_facet |
Yasunaka, Sayaka Siswanto, Eko Olsen, Are Hoppema, Mario Watanabe, Eiji Fransson, Agneta Ingrid Chierici, Melissa Murata, Akihiko Lauvset, Siv Kari Wanninkhof, Rik Takahashi, Taro Kosugi, Naohiro Omar, Abdirahman van Heuven, Steven Mathis, Jeremy T. |
author_sort |
Yasunaka, Sayaka |
title |
Arctic Ocean CO2 uptake: An improved multiyear estimate of the air-sea CO2 flux incorporating chlorophyll a concentrations |
title_short |
Arctic Ocean CO2 uptake: An improved multiyear estimate of the air-sea CO2 flux incorporating chlorophyll a concentrations |
title_full |
Arctic Ocean CO2 uptake: An improved multiyear estimate of the air-sea CO2 flux incorporating chlorophyll a concentrations |
title_fullStr |
Arctic Ocean CO2 uptake: An improved multiyear estimate of the air-sea CO2 flux incorporating chlorophyll a concentrations |
title_full_unstemmed |
Arctic Ocean CO2 uptake: An improved multiyear estimate of the air-sea CO2 flux incorporating chlorophyll a concentrations |
title_sort |
arctic ocean co2 uptake: an improved multiyear estimate of the air-sea co2 flux incorporating chlorophyll a concentrations |
publisher |
EGU |
publishDate |
2018 |
url |
https://hdl.handle.net/1956/19045 https://doi.org/10.5194/bg-15-1643-2018 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice |
genre_facet |
Arctic Arctic Ocean Sea ice |
op_source |
Biogeosciences |
op_relation |
urn:issn:1726-4170 urn:issn:1726-4189 https://hdl.handle.net/1956/19045 https://doi.org/10.5194/bg-15-1643-2018 cristin:1592041 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright The Author(s) 2018 |
op_doi |
https://doi.org/10.5194/bg-15-1643-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
6 |
container_start_page |
1643 |
op_container_end_page |
1661 |
_version_ |
1766322826682302464 |