Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes
The 3-d coupled physical–biogeochemical model ECOHAM (version 3) was applied to the Northwest-European Shelf (47°41′–63°53′N, 15°5′W–13°55′E) for the years 1993–1996. Carbon fluxes were calculated for the years 1995 and 1996 for the inner shelf region, the North Sea (511,725 km2). This period was ch...
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Online Access: | https://oceanrep.geomar.de/id/eprint/9240/ https://oceanrep.geomar.de/id/eprint/9240/1/prowe.pdf https://doi.org/10.1016/j.csr.2010.07.001 |
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ftoceanrep:oai:oceanrep.geomar.de:9240 2023-05-15T17:32:57+02:00 Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes Kühn, Wilfried Pätsch, Johannes Thomas, Helmuth Borges, Alberto V. Schiettecatte, Laure-Sophie Bozec, Yann Prowe, Friederike 2010 text https://oceanrep.geomar.de/id/eprint/9240/ https://oceanrep.geomar.de/id/eprint/9240/1/prowe.pdf https://doi.org/10.1016/j.csr.2010.07.001 en eng Elsevier https://oceanrep.geomar.de/id/eprint/9240/1/prowe.pdf Kühn, W., Pätsch, J., Thomas, H., Borges, A. V., Schiettecatte, L. S., Bozec, Y. and Prowe, F. (2010) Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes. Continental Shelf Research, 30 (16). pp. 1701-1716. DOI 10.1016/j.csr.2010.07.001 <https://doi.org/10.1016/j.csr.2010.07.001>. doi:10.1016/j.csr.2010.07.001 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2010 ftoceanrep https://doi.org/10.1016/j.csr.2010.07.001 2023-04-07T14:57:32Z The 3-d coupled physical–biogeochemical model ECOHAM (version 3) was applied to the Northwest-European Shelf (47°41′–63°53′N, 15°5′W–13°55′E) for the years 1993–1996. Carbon fluxes were calculated for the years 1995 and 1996 for the inner shelf region, the North Sea (511,725 km2). This period was chosen because it corresponds to a shift from a very high winter-time North Atlantic Oscillation Index (NAOI) in 1994/1995, to an extremely low one in 1995/1996, with consequences for the North Sea physics and biogeochemistry. During the first half of 1996, the observed mean SST was about 1 °C lower than in 1995; in the southern part of the North Sea the difference was even larger (up to 3 °C). Due to a different wind regime, the normally prevailing anti-clockwise circulation, as found in winter 1995, was replaced by more complicated circulation patterns in winter 1996. Decreased precipitation over the drainage area of the continental rivers led to a reduction in the total (inorganic and organic) riverine carbon load to the North Sea from 476 Gmol C yr−1 in 1995 to 340 Gmol C yr−1 in 1996. In addition, the North Sea took up 503 Gmol C yr−1 of CO2 from the atmosphere. According to our calculations, the North Sea was a sink for atmospheric CO2, at a rate of 0.98 mol C m−2 yr−1, for both years. The North Sea is divided into two sub-systems: the shallow southern North Sea (SNS; 190,765 km2) and the deeper northern North Sea (NNS; 320,960 km2). According to our findings the SNS is a net-autotrophic system (net ecosystem production NEP>0) but released CO2 to the atmosphere: 159 Gmol C yr−1 in 1995 and 59 Gmol C yr−1 in 1996. There, the temperature-driven release of CO2 outcompetes the biological CO2 drawdown. In the NNS, where respiratory processes prevail (NEP<0), 662 and 562 Gmol C yr−1 were taken up from the atmosphere in 1995 and 1996, respectively. Stratification separates the productive, upper layer from the deeper layers of the water column where respiration/remineralization takes place. Duration and stability of ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Continental Shelf Research 30 16 1701 1716 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The 3-d coupled physical–biogeochemical model ECOHAM (version 3) was applied to the Northwest-European Shelf (47°41′–63°53′N, 15°5′W–13°55′E) for the years 1993–1996. Carbon fluxes were calculated for the years 1995 and 1996 for the inner shelf region, the North Sea (511,725 km2). This period was chosen because it corresponds to a shift from a very high winter-time North Atlantic Oscillation Index (NAOI) in 1994/1995, to an extremely low one in 1995/1996, with consequences for the North Sea physics and biogeochemistry. During the first half of 1996, the observed mean SST was about 1 °C lower than in 1995; in the southern part of the North Sea the difference was even larger (up to 3 °C). Due to a different wind regime, the normally prevailing anti-clockwise circulation, as found in winter 1995, was replaced by more complicated circulation patterns in winter 1996. Decreased precipitation over the drainage area of the continental rivers led to a reduction in the total (inorganic and organic) riverine carbon load to the North Sea from 476 Gmol C yr−1 in 1995 to 340 Gmol C yr−1 in 1996. In addition, the North Sea took up 503 Gmol C yr−1 of CO2 from the atmosphere. According to our calculations, the North Sea was a sink for atmospheric CO2, at a rate of 0.98 mol C m−2 yr−1, for both years. The North Sea is divided into two sub-systems: the shallow southern North Sea (SNS; 190,765 km2) and the deeper northern North Sea (NNS; 320,960 km2). According to our findings the SNS is a net-autotrophic system (net ecosystem production NEP>0) but released CO2 to the atmosphere: 159 Gmol C yr−1 in 1995 and 59 Gmol C yr−1 in 1996. There, the temperature-driven release of CO2 outcompetes the biological CO2 drawdown. In the NNS, where respiratory processes prevail (NEP<0), 662 and 562 Gmol C yr−1 were taken up from the atmosphere in 1995 and 1996, respectively. Stratification separates the productive, upper layer from the deeper layers of the water column where respiration/remineralization takes place. Duration and stability of ... |
format |
Article in Journal/Newspaper |
author |
Kühn, Wilfried Pätsch, Johannes Thomas, Helmuth Borges, Alberto V. Schiettecatte, Laure-Sophie Bozec, Yann Prowe, Friederike |
spellingShingle |
Kühn, Wilfried Pätsch, Johannes Thomas, Helmuth Borges, Alberto V. Schiettecatte, Laure-Sophie Bozec, Yann Prowe, Friederike Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes |
author_facet |
Kühn, Wilfried Pätsch, Johannes Thomas, Helmuth Borges, Alberto V. Schiettecatte, Laure-Sophie Bozec, Yann Prowe, Friederike |
author_sort |
Kühn, Wilfried |
title |
Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes |
title_short |
Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes |
title_full |
Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes |
title_fullStr |
Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes |
title_full_unstemmed |
Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes |
title_sort |
nitrogen and carbon cycling in the north sea and exchange with the north atlantic? a model study, part ii: carbon budget and fluxes |
publisher |
Elsevier |
publishDate |
2010 |
url |
https://oceanrep.geomar.de/id/eprint/9240/ https://oceanrep.geomar.de/id/eprint/9240/1/prowe.pdf https://doi.org/10.1016/j.csr.2010.07.001 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://oceanrep.geomar.de/id/eprint/9240/1/prowe.pdf Kühn, W., Pätsch, J., Thomas, H., Borges, A. V., Schiettecatte, L. S., Bozec, Y. and Prowe, F. (2010) Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic? A model study, Part II: Carbon budget and fluxes. Continental Shelf Research, 30 (16). pp. 1701-1716. DOI 10.1016/j.csr.2010.07.001 <https://doi.org/10.1016/j.csr.2010.07.001>. doi:10.1016/j.csr.2010.07.001 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.csr.2010.07.001 |
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Continental Shelf Research |
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30 |
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16 |
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1701 |
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1716 |
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1766131288319721472 |