Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003-2015
For continental shelf regions, the long‐term trend in sea surface carbon dioxide (CO2) partial pressure (pCO2) and rates of ocean acidification are not accurately known. Here, we investigate the decadal trend of observed wintertime pCO2 as well as computed wintertime pH and aragonite saturation stat...
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Online Access: | https://hdl.handle.net/1956/21791 https://doi.org/10.1029/2018jg004992 |
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ftunivbergen:oai:bora.uib.no:1956/21791 2023-05-15T17:31:18+02:00 Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003-2015 Omar, Abdirahman Thomas, Helmuth Olsen, Are Becker, Meike Skjelvan, Ingunn Reverdin, Gilles 2020-01-31T15:53:29Z application/pdf https://hdl.handle.net/1956/21791 https://doi.org/10.1029/2018jg004992 eng eng American Geophysical Union EC/H2020: 654462 Norges forskningsråd: 245972 Miljødirektoratet: 258608 Miljødirektoratet: 17078007 urn:issn:2169-8953 urn:issn:2169-8961 https://hdl.handle.net/1956/21791 https://doi.org/10.1029/2018jg004992 cristin:1754647 Attribution CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2019 The Author(s) Journal of Geophysical Research (JGR): Biogeosciences Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1029/2018jg004992 2023-03-14T17:42:01Z For continental shelf regions, the long‐term trend in sea surface carbon dioxide (CO2) partial pressure (pCO2) and rates of ocean acidification are not accurately known. Here, we investigate the decadal trend of observed wintertime pCO2 as well as computed wintertime pH and aragonite saturation state (Ωar) in the northern North Sea, using the first decade long monthly underway data from a voluntary observing ship covering the period 2004–2015. We also evaluate how seawater CO2 chemistry, in response to physical and biological processes, drives variations in the above parameters on seasonal and interannual timescales. In the northern North Sea, pCO2, pH, and Ωar are subject to strong seasonal variations with mean wintertime values of 375 ± 11 μatm, 8.17 ± 0.01, and 1.96 ± 0.05. Dissolved inorganic carbon is found to be the primary driver of both seasonal and interannual changes while total alkalinity and sea surface temperature have secondary effects that reduce the changes produced by dissolved inorganic carbon. Average interannual variations during winter are around 3%, 0.1%, and 2% for pCO2, pH, and Ωar, respectively and slightly larger in the eastern part of the study area (Skagerrak region) than in the western part (North Atlantic Water region). Statistically significant long‐term trends were found only in the North Atlantic Water region with mean annual rates of 2.39 ± 0.58 μatm/year, −0.0024 ± 0.001 year‐1, and −0.010 ± 0.003 year‐1 for pCO2, pH, and Ωar, respectively. The drivers of the observed trends as well as reasons for the lack of statistically significant trends in the Skagerrak region are discussed. publishedVersion Article in Journal/Newspaper North Atlantic Ocean acidification University of Bergen: Bergen Open Research Archive (BORA-UiB) Journal of Geophysical Research: Biogeosciences 124 10 3088 3103 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
For continental shelf regions, the long‐term trend in sea surface carbon dioxide (CO2) partial pressure (pCO2) and rates of ocean acidification are not accurately known. Here, we investigate the decadal trend of observed wintertime pCO2 as well as computed wintertime pH and aragonite saturation state (Ωar) in the northern North Sea, using the first decade long monthly underway data from a voluntary observing ship covering the period 2004–2015. We also evaluate how seawater CO2 chemistry, in response to physical and biological processes, drives variations in the above parameters on seasonal and interannual timescales. In the northern North Sea, pCO2, pH, and Ωar are subject to strong seasonal variations with mean wintertime values of 375 ± 11 μatm, 8.17 ± 0.01, and 1.96 ± 0.05. Dissolved inorganic carbon is found to be the primary driver of both seasonal and interannual changes while total alkalinity and sea surface temperature have secondary effects that reduce the changes produced by dissolved inorganic carbon. Average interannual variations during winter are around 3%, 0.1%, and 2% for pCO2, pH, and Ωar, respectively and slightly larger in the eastern part of the study area (Skagerrak region) than in the western part (North Atlantic Water region). Statistically significant long‐term trends were found only in the North Atlantic Water region with mean annual rates of 2.39 ± 0.58 μatm/year, −0.0024 ± 0.001 year‐1, and −0.010 ± 0.003 year‐1 for pCO2, pH, and Ωar, respectively. The drivers of the observed trends as well as reasons for the lack of statistically significant trends in the Skagerrak region are discussed. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Omar, Abdirahman Thomas, Helmuth Olsen, Are Becker, Meike Skjelvan, Ingunn Reverdin, Gilles |
spellingShingle |
Omar, Abdirahman Thomas, Helmuth Olsen, Are Becker, Meike Skjelvan, Ingunn Reverdin, Gilles Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003-2015 |
author_facet |
Omar, Abdirahman Thomas, Helmuth Olsen, Are Becker, Meike Skjelvan, Ingunn Reverdin, Gilles |
author_sort |
Omar, Abdirahman |
title |
Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003-2015 |
title_short |
Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003-2015 |
title_full |
Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003-2015 |
title_fullStr |
Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003-2015 |
title_full_unstemmed |
Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003-2015 |
title_sort |
trends of ocean acidification and pco2 in the northern north sea, 2003-2015 |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/21791 https://doi.org/10.1029/2018jg004992 |
genre |
North Atlantic Ocean acidification |
genre_facet |
North Atlantic Ocean acidification |
op_source |
Journal of Geophysical Research (JGR): Biogeosciences |
op_relation |
EC/H2020: 654462 Norges forskningsråd: 245972 Miljødirektoratet: 258608 Miljødirektoratet: 17078007 urn:issn:2169-8953 urn:issn:2169-8961 https://hdl.handle.net/1956/21791 https://doi.org/10.1029/2018jg004992 cristin:1754647 |
op_rights |
Attribution CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2019 The Author(s) |
op_doi |
https://doi.org/10.1029/2018jg004992 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
124 |
container_issue |
10 |
container_start_page |
3088 |
op_container_end_page |
3103 |
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1766128803447308288 |