Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea
The influence of large-scale oceanic circulation on salinity in the northern North Sea has lead to the hypothesis that nutrient concentrations in this region are also driven by remote oceanic anomalies. Here, using a newly established biogeochemical data set of the North Sea, we show that interannua...
Published in: | Journal of Geophysical Research: Oceans |
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ftsubggeo:oai:e-docs.geo-leo.de:11858/9115 2023-05-15T17:31:33+02:00 Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea Pätsch, Johannes Gouretski, Viktor Hinrichs, Iris Koul, Vimal 2020 https://doi.org/10.1029/2019JC015825 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9115 eng eng doi:10.1029/2019JC015825 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9115 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY ddc:551.46 North Sea Subpolar Front Position Nutrients Salinity doc-type:article 2020 ftsubggeo https://doi.org/10.1029/2019JC015825 2022-11-09T06:51:40Z The influence of large-scale oceanic circulation on salinity in the northern North Sea has lead to the hypothesis that nutrient concentrations in this region are also driven by remote oceanic anomalies. Here, using a newly established biogeochemical data set of the North Sea, we show that interannual to decadal variability in winter nutrient concentrations exhibits distinct phase deviations from salinity. The variability in salinity is explained by zonal shifts in the position of the subpolar front (SPF) in the eastern North Atlantic and the associated advective delay. However, the high correlation and absence of advective delay between the position of the SPF and winter nutrient concentrations in the Shetland region (59–61°N, 1°W to 3°E) point to the role of atmospheric variability in driving concurrent changes in winter nutrient concentrations and the SPF position. Our analysis suggests that the prevailing wind direction and local distribution of winter nutrient concentrations together determine the interannual to decadal variability in winter nutrient concentrations in this region. In the analyzed observations, we find a strong spatial gradient in mean winter nutrient concentrations northwest of the Shetland region, which is absent in salinity. The horizontal shift of this spatial gradient, forced by changes in wind direction, has a larger influence on winter nutrient concentration in the Shetland region than the nutrient signal in oceanic anomalies originating from the eastern subpolar North Atlantic. Overall, we conclude that interannual to decadal variability in the observed nutrient concentrations is mainly driven by atmospheric variability here expressed as wind direction. Article in Journal/Newspaper North Atlantic GEO-LEOe-docs (FID GEO) Journal of Geophysical Research: Oceans 125 5 |
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Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
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ftsubggeo |
language |
English |
topic |
ddc:551.46 North Sea Subpolar Front Position Nutrients Salinity |
spellingShingle |
ddc:551.46 North Sea Subpolar Front Position Nutrients Salinity Pätsch, Johannes Gouretski, Viktor Hinrichs, Iris Koul, Vimal Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea |
topic_facet |
ddc:551.46 North Sea Subpolar Front Position Nutrients Salinity |
description |
The influence of large-scale oceanic circulation on salinity in the northern North Sea has lead to the hypothesis that nutrient concentrations in this region are also driven by remote oceanic anomalies. Here, using a newly established biogeochemical data set of the North Sea, we show that interannual to decadal variability in winter nutrient concentrations exhibits distinct phase deviations from salinity. The variability in salinity is explained by zonal shifts in the position of the subpolar front (SPF) in the eastern North Atlantic and the associated advective delay. However, the high correlation and absence of advective delay between the position of the SPF and winter nutrient concentrations in the Shetland region (59–61°N, 1°W to 3°E) point to the role of atmospheric variability in driving concurrent changes in winter nutrient concentrations and the SPF position. Our analysis suggests that the prevailing wind direction and local distribution of winter nutrient concentrations together determine the interannual to decadal variability in winter nutrient concentrations in this region. In the analyzed observations, we find a strong spatial gradient in mean winter nutrient concentrations northwest of the Shetland region, which is absent in salinity. The horizontal shift of this spatial gradient, forced by changes in wind direction, has a larger influence on winter nutrient concentration in the Shetland region than the nutrient signal in oceanic anomalies originating from the eastern subpolar North Atlantic. Overall, we conclude that interannual to decadal variability in the observed nutrient concentrations is mainly driven by atmospheric variability here expressed as wind direction. |
format |
Article in Journal/Newspaper |
author |
Pätsch, Johannes Gouretski, Viktor Hinrichs, Iris Koul, Vimal |
author_facet |
Pätsch, Johannes Gouretski, Viktor Hinrichs, Iris Koul, Vimal |
author_sort |
Pätsch, Johannes |
title |
Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea |
title_short |
Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea |
title_full |
Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea |
title_fullStr |
Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea |
title_full_unstemmed |
Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea |
title_sort |
distinct mechanisms underlying interannual to decadal variability of observed salinity and nutrient concentration in the northern north sea |
publishDate |
2020 |
url |
https://doi.org/10.1029/2019JC015825 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9115 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
doi:10.1029/2019JC015825 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9115 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2019JC015825 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
5 |
_version_ |
1766129205017313280 |