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...
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fthzgzmk:oai:publications.hereon.de:39103 2023-06-11T04:14:34+02:00 Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea Pätsch, J. Gouretski, V. Hinrichs, I. Koul, V. 2020 https://publications.hereon.de/id/39103 https://publications.hzg.de/id/39103 https://doi.org/10.1029/2019JC015825 en eng AGU https://dx.doi.org/10.1029/2019JC015825 urn:issn:2169-9275 https://publications.hereon.de/id/39103 https://publications.hzg.de/id/39103 info:eu-repo/semantics/openAccess open_access oa_allgemein_hybrid issn:2169-9275 Pätsch, J.; Gouretski, V.; Hinrichs, I.; Koul, V.: Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea. In: Journal of Geophysical Research : Oceans. Vol. 125 (2020) 5, e2019JC015825. (DOI: /10.1029/2019JC015825) info:eu-repo/semantics/article Zeitschrift Artikel 2020 fthzgzmk https://doi.org/10.1029/2019JC015825 2023-05-28T23:25:04Z 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 Hereon Publications (Helmholtz-Zentrum) Journal of Geophysical Research: Oceans 125 5 |
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Open Polar |
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Hereon Publications (Helmholtz-Zentrum) |
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fthzgzmk |
language |
English |
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, J. Gouretski, V. Hinrichs, I. Koul, V. |
spellingShingle |
Pätsch, J. Gouretski, V. Hinrichs, I. Koul, V. Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea |
author_facet |
Pätsch, J. Gouretski, V. Hinrichs, I. Koul, V. |
author_sort |
Pätsch, J. |
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 |
publisher |
AGU |
publishDate |
2020 |
url |
https://publications.hereon.de/id/39103 https://publications.hzg.de/id/39103 https://doi.org/10.1029/2019JC015825 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
issn:2169-9275 Pätsch, J.; Gouretski, V.; Hinrichs, I.; Koul, V.: Distinct Mechanisms Underlying Interannual to Decadal Variability of Observed Salinity and Nutrient Concentration in the Northern North Sea. In: Journal of Geophysical Research : Oceans. Vol. 125 (2020) 5, e2019JC015825. (DOI: /10.1029/2019JC015825) |
op_relation |
https://dx.doi.org/10.1029/2019JC015825 urn:issn:2169-9275 https://publications.hereon.de/id/39103 https://publications.hzg.de/id/39103 |
op_rights |
info:eu-repo/semantics/openAccess open_access oa_allgemein_hybrid |
op_doi |
https://doi.org/10.1029/2019JC015825 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
5 |
_version_ |
1768392658145771520 |