Variability of Sea-Air Carbon Dioxide Flux in Autumn Across the Weddell Gyre and Offshore Dronning Maud Land in the Southern Ocean.
Sea surface fugacity of carbon dioxide (fCO2ssw) was measured across the Weddell gyre and the eastern sector in the Atlantic Southern Ocean in autumn. During the occupation between February and April 2019, the region of the study transect was a potential ocean CO2 sink. A net CO2 flux (FCO2) of −6.2...
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Language: | English |
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2021
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Online Access: | http://hdl.handle.net/1834/42798 https://doi.org/10.3389/fmars.2020.614263 |
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ftoceandocs:oai:aquadocs.org:1834/42798 2023-10-25T01:29:55+02:00 Variability of Sea-Air Carbon Dioxide Flux in Autumn Across the Weddell Gyre and Offshore Dronning Maud Land in the Southern Ocean. Ogundare, Margaret Ojone Fransson, Agneta Chierici, Melissa Joubert, Warren R. Roychoudhury, Alakendra N. Antarctic coast Maud Rise Astrid Ridge 2021 http://hdl.handle.net/1834/42798 https://doi.org/10.3389/fmars.2020.614263 en eng https://www.frontiersin.org/articles/10.3389/fmars.2020.614263/full https://doi.org/10.3389/fmars.2020.614263 http://hdl.handle.net/1834/42798 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ CO2 and biogeochemical drivers Chlorophyll Oxygen saturation Sea ice Journal Contribution 2021 ftoceandocs https://doi.org/10.3389/fmars.2020.614263 2023-09-27T22:24:55Z Sea surface fugacity of carbon dioxide (fCO2ssw) was measured across the Weddell gyre and the eastern sector in the Atlantic Southern Ocean in autumn. During the occupation between February and April 2019, the region of the study transect was a potential ocean CO2 sink. A net CO2 flux (FCO2) of −6.2 (± 8; sink) mmol m–2 d–1 was estimated for the entire study region, with the largest average CO2 sink of −10.0 (± 8) mmol m–2 d–1 in the partly ice-covered Astrid Ridge (AR) region near the coast at 68°S and −6.1 (± 8) mmol m–2d–1 was observed in the Maud Rise (MR) region. A CO2 sink was also observed south of 66°S in the Weddell Sea (WS). To assess the main drivers describing the variability of fCO2ssw, a correlation model using fCO2 and oxygen saturation was considered. Spatial distributions of the fCO2 saturation/O2 saturation correlations, described relative to the surface water properties of the controlling variables (chlorophyll a, apparent oxygen utilization (AOU), sea surface temperature, and sea surface salinity) further constrained the interplay of the processes driving the fCO2ssw distributions. Photosynthetic CO2 drawdown significantly offsets the influence of the upwelling of CO2-rich waters in the central Weddell gyre and enhanced the CO2 sink in the region. FCO2 of −6.9 mmol m–2 d–1 estimated for the Weddell gyre in this study was different from FCO2 of −2.5 mmol m–2 d–1 in autumn estimated in a previous study. Due to low CO2 data coverage during autumn, limited sea-air CO2 flux estimates from direct sea-surface CO2 observations particularly for the Weddell gyre region are available with which to compare the values estimated in this study. This highlights the importance of increasing seasonal CO2 observations especially during autumn/winter to improving the seasonal coverage of flux estimates in the seasonal sea ice-covered regions of the Southern Ocean. Challenge 4, 9 Published Refereed Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land Sea ice Southern Ocean Weddell Sea IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications Antarctic Astrid Ridge ENVELOPE(12.000,12.000,-68.000,-68.000) Dronning Maud Land Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Southern Ocean Weddell Weddell Sea Frontiers in Marine Science 7 |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
topic |
CO2 and biogeochemical drivers Chlorophyll Oxygen saturation Sea ice |
spellingShingle |
CO2 and biogeochemical drivers Chlorophyll Oxygen saturation Sea ice Ogundare, Margaret Ojone Fransson, Agneta Chierici, Melissa Joubert, Warren R. Roychoudhury, Alakendra N. Variability of Sea-Air Carbon Dioxide Flux in Autumn Across the Weddell Gyre and Offshore Dronning Maud Land in the Southern Ocean. |
topic_facet |
CO2 and biogeochemical drivers Chlorophyll Oxygen saturation Sea ice |
description |
Sea surface fugacity of carbon dioxide (fCO2ssw) was measured across the Weddell gyre and the eastern sector in the Atlantic Southern Ocean in autumn. During the occupation between February and April 2019, the region of the study transect was a potential ocean CO2 sink. A net CO2 flux (FCO2) of −6.2 (± 8; sink) mmol m–2 d–1 was estimated for the entire study region, with the largest average CO2 sink of −10.0 (± 8) mmol m–2 d–1 in the partly ice-covered Astrid Ridge (AR) region near the coast at 68°S and −6.1 (± 8) mmol m–2d–1 was observed in the Maud Rise (MR) region. A CO2 sink was also observed south of 66°S in the Weddell Sea (WS). To assess the main drivers describing the variability of fCO2ssw, a correlation model using fCO2 and oxygen saturation was considered. Spatial distributions of the fCO2 saturation/O2 saturation correlations, described relative to the surface water properties of the controlling variables (chlorophyll a, apparent oxygen utilization (AOU), sea surface temperature, and sea surface salinity) further constrained the interplay of the processes driving the fCO2ssw distributions. Photosynthetic CO2 drawdown significantly offsets the influence of the upwelling of CO2-rich waters in the central Weddell gyre and enhanced the CO2 sink in the region. FCO2 of −6.9 mmol m–2 d–1 estimated for the Weddell gyre in this study was different from FCO2 of −2.5 mmol m–2 d–1 in autumn estimated in a previous study. Due to low CO2 data coverage during autumn, limited sea-air CO2 flux estimates from direct sea-surface CO2 observations particularly for the Weddell gyre region are available with which to compare the values estimated in this study. This highlights the importance of increasing seasonal CO2 observations especially during autumn/winter to improving the seasonal coverage of flux estimates in the seasonal sea ice-covered regions of the Southern Ocean. Challenge 4, 9 Published Refereed |
format |
Article in Journal/Newspaper |
author |
Ogundare, Margaret Ojone Fransson, Agneta Chierici, Melissa Joubert, Warren R. Roychoudhury, Alakendra N. |
author_facet |
Ogundare, Margaret Ojone Fransson, Agneta Chierici, Melissa Joubert, Warren R. Roychoudhury, Alakendra N. |
author_sort |
Ogundare, Margaret Ojone |
title |
Variability of Sea-Air Carbon Dioxide Flux in Autumn Across the Weddell Gyre and Offshore Dronning Maud Land in the Southern Ocean. |
title_short |
Variability of Sea-Air Carbon Dioxide Flux in Autumn Across the Weddell Gyre and Offshore Dronning Maud Land in the Southern Ocean. |
title_full |
Variability of Sea-Air Carbon Dioxide Flux in Autumn Across the Weddell Gyre and Offshore Dronning Maud Land in the Southern Ocean. |
title_fullStr |
Variability of Sea-Air Carbon Dioxide Flux in Autumn Across the Weddell Gyre and Offshore Dronning Maud Land in the Southern Ocean. |
title_full_unstemmed |
Variability of Sea-Air Carbon Dioxide Flux in Autumn Across the Weddell Gyre and Offshore Dronning Maud Land in the Southern Ocean. |
title_sort |
variability of sea-air carbon dioxide flux in autumn across the weddell gyre and offshore dronning maud land in the southern ocean. |
publishDate |
2021 |
url |
http://hdl.handle.net/1834/42798 https://doi.org/10.3389/fmars.2020.614263 |
op_coverage |
Antarctic coast Maud Rise Astrid Ridge |
long_lat |
ENVELOPE(12.000,12.000,-68.000,-68.000) ENVELOPE(3.000,3.000,-66.000,-66.000) |
geographic |
Antarctic Astrid Ridge Dronning Maud Land Maud Rise Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Astrid Ridge Dronning Maud Land Maud Rise Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Dronning Maud Land Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Dronning Maud Land Sea ice Southern Ocean Weddell Sea |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2020.614263/full https://doi.org/10.3389/fmars.2020.614263 http://hdl.handle.net/1834/42798 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2020.614263 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
_version_ |
1780735503791816704 |