A detailed view on the seasonality of stable carbon isotopes across the North Atlantic
The North Atlantic Ocean plays a major role in climate change not the least due to its importance in CO2 uptake and thus natural carbon sequestration. The CO2 concentration in its surface waters, which determines the ocean's CO2 sink/source function, varies on seasonal and interannual timescale...
Published in: | Global Biogeochemical Cycles |
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Language: | English |
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AGU (American Geophysical Union)
2018
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Online Access: | https://oceanrep.geomar.de/id/eprint/44388/ https://oceanrep.geomar.de/id/eprint/44388/2/Becker_et_al-2018-Global_Biogeochemical_Cycles.sup-1.pdf https://oceanrep.geomar.de/id/eprint/44388/13/Becker_et_al-2018-Global_Biogeochemical_Cycles.pdf https://doi.org/10.1029/2018GB005905 |
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ftoceanrep:oai:oceanrep.geomar.de:44388 2023-05-15T17:29:22+02:00 A detailed view on the seasonality of stable carbon isotopes across the North Atlantic Becker, Meike Steinhoff, Tobias Körtzinger, Arne 2018-09-28 text https://oceanrep.geomar.de/id/eprint/44388/ https://oceanrep.geomar.de/id/eprint/44388/2/Becker_et_al-2018-Global_Biogeochemical_Cycles.sup-1.pdf https://oceanrep.geomar.de/id/eprint/44388/13/Becker_et_al-2018-Global_Biogeochemical_Cycles.pdf https://doi.org/10.1029/2018GB005905 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/44388/2/Becker_et_al-2018-Global_Biogeochemical_Cycles.sup-1.pdf https://oceanrep.geomar.de/id/eprint/44388/13/Becker_et_al-2018-Global_Biogeochemical_Cycles.pdf Becker, M., Steinhoff, T. and Körtzinger, A. (2018) A detailed view on the seasonality of stable carbon isotopes across the North Atlantic. Open Access Global Biogeochemical Cycles, 32 (9). pp. 1406-1419. DOI 10.1029/2018GB005905 <https://doi.org/10.1029/2018GB005905>. doi:10.1029/2018GB005905 cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2018 ftoceanrep https://doi.org/10.1029/2018GB005905 2023-04-07T15:41:35Z The North Atlantic Ocean plays a major role in climate change not the least due to its importance in CO2 uptake and thus natural carbon sequestration. The CO2 concentration in its surface waters, which determines the ocean's CO2 sink/source function, varies on seasonal and interannual timescales and is mainly driven by air‐sea gas exchange, temperature variability and biological production/respiration. The variability in stable carbon isotope signatures can provide further insight and help to improve the understanding of the controls of the surface ocean carbon system. In this work, a cavity ringdown spectrometer was coupled to a classical, equilibrator‐based pCO2 system on a VOS line that regularly sails across the subpolar North Atlantic between North America and Europe. From 2012 to 2014, a 3‐year time series of underway surface δ13C(CO2) data was obtained along with continuous measurements of temperature, salinity and fCO2. We perform a decomposition of thermal and non‐thermal drivers of fCO2 and δ13C(CO2). The direct measurement of the surface ocean δ13C(CO2) allows us to estimate the mass flux and also the stable carbon isotope fractionation during air‐sea gas exchange. While the CO2 mass flow was in the range of 1 − 2 mol CO2 m−2 yr−1 on the shelves and 2.5 − 3.5 mol CO2 m−2 yr−1 in the open ocean, the isotope signature of this CO2 flux with respect to the sea surface ranged from −2.6 ± 1.4‰ on the shelves to −6.6 ± 0.9‰ in the western and −4.5 ± 0.9‰ in the eastern part of the open ocean section. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Global Biogeochemical Cycles 32 9 1406 1419 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The North Atlantic Ocean plays a major role in climate change not the least due to its importance in CO2 uptake and thus natural carbon sequestration. The CO2 concentration in its surface waters, which determines the ocean's CO2 sink/source function, varies on seasonal and interannual timescales and is mainly driven by air‐sea gas exchange, temperature variability and biological production/respiration. The variability in stable carbon isotope signatures can provide further insight and help to improve the understanding of the controls of the surface ocean carbon system. In this work, a cavity ringdown spectrometer was coupled to a classical, equilibrator‐based pCO2 system on a VOS line that regularly sails across the subpolar North Atlantic between North America and Europe. From 2012 to 2014, a 3‐year time series of underway surface δ13C(CO2) data was obtained along with continuous measurements of temperature, salinity and fCO2. We perform a decomposition of thermal and non‐thermal drivers of fCO2 and δ13C(CO2). The direct measurement of the surface ocean δ13C(CO2) allows us to estimate the mass flux and also the stable carbon isotope fractionation during air‐sea gas exchange. While the CO2 mass flow was in the range of 1 − 2 mol CO2 m−2 yr−1 on the shelves and 2.5 − 3.5 mol CO2 m−2 yr−1 in the open ocean, the isotope signature of this CO2 flux with respect to the sea surface ranged from −2.6 ± 1.4‰ on the shelves to −6.6 ± 0.9‰ in the western and −4.5 ± 0.9‰ in the eastern part of the open ocean section. |
format |
Article in Journal/Newspaper |
author |
Becker, Meike Steinhoff, Tobias Körtzinger, Arne |
spellingShingle |
Becker, Meike Steinhoff, Tobias Körtzinger, Arne A detailed view on the seasonality of stable carbon isotopes across the North Atlantic |
author_facet |
Becker, Meike Steinhoff, Tobias Körtzinger, Arne |
author_sort |
Becker, Meike |
title |
A detailed view on the seasonality of stable carbon isotopes across the North Atlantic |
title_short |
A detailed view on the seasonality of stable carbon isotopes across the North Atlantic |
title_full |
A detailed view on the seasonality of stable carbon isotopes across the North Atlantic |
title_fullStr |
A detailed view on the seasonality of stable carbon isotopes across the North Atlantic |
title_full_unstemmed |
A detailed view on the seasonality of stable carbon isotopes across the North Atlantic |
title_sort |
detailed view on the seasonality of stable carbon isotopes across the north atlantic |
publisher |
AGU (American Geophysical Union) |
publishDate |
2018 |
url |
https://oceanrep.geomar.de/id/eprint/44388/ https://oceanrep.geomar.de/id/eprint/44388/2/Becker_et_al-2018-Global_Biogeochemical_Cycles.sup-1.pdf https://oceanrep.geomar.de/id/eprint/44388/13/Becker_et_al-2018-Global_Biogeochemical_Cycles.pdf https://doi.org/10.1029/2018GB005905 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/44388/2/Becker_et_al-2018-Global_Biogeochemical_Cycles.sup-1.pdf https://oceanrep.geomar.de/id/eprint/44388/13/Becker_et_al-2018-Global_Biogeochemical_Cycles.pdf Becker, M., Steinhoff, T. and Körtzinger, A. (2018) A detailed view on the seasonality of stable carbon isotopes across the North Atlantic. Open Access Global Biogeochemical Cycles, 32 (9). pp. 1406-1419. DOI 10.1029/2018GB005905 <https://doi.org/10.1029/2018GB005905>. doi:10.1029/2018GB005905 |
op_rights |
cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018GB005905 |
container_title |
Global Biogeochemical Cycles |
container_volume |
32 |
container_issue |
9 |
container_start_page |
1406 |
op_container_end_page |
1419 |
_version_ |
1766123271379484672 |