The northern European shelf as an increasing net sink for CO2

We developed a simple method to refine existing open-ocean maps and extend them towards different coastal seas. Using a multi-linear regression we produced monthly maps of surface ocean f CO 2 in the northern European coastal seas (the North Sea, the Baltic Sea, the Norwegian Coast and the Barents S...

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Published in:Biogeosciences
Main Authors: Becker, Meike, Olsen, Are, Landschützer, Peter, Omar, Abdirhaman, Rehder, Gregor, Rödenbeck, Christian, Skjelvan, Ingunn
Format: Text
Language:English
Published: 2021
Subjects:
Online Access:https://doi.org/10.5194/bg-18-1127-2021
https://bg.copernicus.org/articles/18/1127/2021/
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spelling ftcopernicus:oai:publications.copernicus.org:bg82138 2023-05-15T15:38:46+02:00 The northern European shelf as an increasing net sink for CO2 Becker, Meike Olsen, Are Landschützer, Peter Omar, Abdirhaman Rehder, Gregor Rödenbeck, Christian Skjelvan, Ingunn 2021-02-15 application/pdf https://doi.org/10.5194/bg-18-1127-2021 https://bg.copernicus.org/articles/18/1127/2021/ eng eng doi:10.5194/bg-18-1127-2021 https://bg.copernicus.org/articles/18/1127/2021/ eISSN: 1726-4189 Text 2021 ftcopernicus https://doi.org/10.5194/bg-18-1127-2021 2021-02-22T17:22:15Z We developed a simple method to refine existing open-ocean maps and extend them towards different coastal seas. Using a multi-linear regression we produced monthly maps of surface ocean f CO 2 in the northern European coastal seas (the North Sea, the Baltic Sea, the Norwegian Coast and the Barents Sea) covering a time period from 1998 to 2016. A comparison with gridded Surface Ocean CO 2 Atlas (SOCAT) v5 data revealed mean biases and standard deviations of 0 ± 26 µatm in the North Sea, 0 ± 16 µatm along the Norwegian Coast, 0 ± 19 µatm in the Barents Sea and 2 ± 42 µatm in the Baltic Sea. We used these maps to investigate trends in f CO 2 , pH and air–sea CO 2 flux. The surface ocean f CO 2 trends are smaller than the atmospheric trend in most of the studied regions. The only exception to this is the western part of the North Sea, where sea surface f CO 2 increases by 2 µatm yr −1 , which is similar to the atmospheric trend. The Baltic Sea does not show a significant trend. Here, the variability was much larger than the expected trends. Consistently, the pH trends were smaller than expected for an increase in f CO 2 in pace with the rise of atmospheric CO 2 levels. The calculated air–sea CO 2 fluxes revealed that most regions were net sinks for CO 2 . Only the southern North Sea and the Baltic Sea emitted CO 2 to the atmosphere. Especially in the northern regions the sink strength increased during the studied period. Text Barents Sea Copernicus Publications: E-Journals Barents Sea Biogeosciences 18 3 1127 1147
institution Open Polar
collection Copernicus Publications: E-Journals
op_collection_id ftcopernicus
language English
description We developed a simple method to refine existing open-ocean maps and extend them towards different coastal seas. Using a multi-linear regression we produced monthly maps of surface ocean f CO 2 in the northern European coastal seas (the North Sea, the Baltic Sea, the Norwegian Coast and the Barents Sea) covering a time period from 1998 to 2016. A comparison with gridded Surface Ocean CO 2 Atlas (SOCAT) v5 data revealed mean biases and standard deviations of 0 ± 26 µatm in the North Sea, 0 ± 16 µatm along the Norwegian Coast, 0 ± 19 µatm in the Barents Sea and 2 ± 42 µatm in the Baltic Sea. We used these maps to investigate trends in f CO 2 , pH and air–sea CO 2 flux. The surface ocean f CO 2 trends are smaller than the atmospheric trend in most of the studied regions. The only exception to this is the western part of the North Sea, where sea surface f CO 2 increases by 2 µatm yr −1 , which is similar to the atmospheric trend. The Baltic Sea does not show a significant trend. Here, the variability was much larger than the expected trends. Consistently, the pH trends were smaller than expected for an increase in f CO 2 in pace with the rise of atmospheric CO 2 levels. The calculated air–sea CO 2 fluxes revealed that most regions were net sinks for CO 2 . Only the southern North Sea and the Baltic Sea emitted CO 2 to the atmosphere. Especially in the northern regions the sink strength increased during the studied period.
format Text
author Becker, Meike
Olsen, Are
Landschützer, Peter
Omar, Abdirhaman
Rehder, Gregor
Rödenbeck, Christian
Skjelvan, Ingunn
spellingShingle Becker, Meike
Olsen, Are
Landschützer, Peter
Omar, Abdirhaman
Rehder, Gregor
Rödenbeck, Christian
Skjelvan, Ingunn
The northern European shelf as an increasing net sink for CO2
author_facet Becker, Meike
Olsen, Are
Landschützer, Peter
Omar, Abdirhaman
Rehder, Gregor
Rödenbeck, Christian
Skjelvan, Ingunn
author_sort Becker, Meike
title The northern European shelf as an increasing net sink for CO2
title_short The northern European shelf as an increasing net sink for CO2
title_full The northern European shelf as an increasing net sink for CO2
title_fullStr The northern European shelf as an increasing net sink for CO2
title_full_unstemmed The northern European shelf as an increasing net sink for CO2
title_sort northern european shelf as an increasing net sink for co2
publishDate 2021
url https://doi.org/10.5194/bg-18-1127-2021
https://bg.copernicus.org/articles/18/1127/2021/
geographic Barents Sea
geographic_facet Barents Sea
genre Barents Sea
genre_facet Barents Sea
op_source eISSN: 1726-4189
op_relation doi:10.5194/bg-18-1127-2021
https://bg.copernicus.org/articles/18/1127/2021/
op_doi https://doi.org/10.5194/bg-18-1127-2021
container_title Biogeosciences
container_volume 18
container_issue 3
container_start_page 1127
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