EGU21-2220, updated on 03 Mar 2021
https://doi.org/10.5194/egusphere-egu21-2220
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

A satellite-based Lagrangian view on the origin of water-masses in the northern European shelf seas

Ezra Eisbrenner1,2 and Léon Chafik1
Ezra Eisbrenner and Léon Chafik
  • 1Department of Meteorology, Stockholm University, Stockholm, Sweden
  • 2ezra.eisbrenner@misu.su.se

Knowledge about water-mass properties is critical to understanding how ocean climate variability impacts the shelf seas. Disentangling the origin of shelf sea water-masses and associated driving mechanisms is, therefore, a significant step towards improving the predictive skill related to water-mass evolution. Especially more conservative water-mass properties, even of surface waters, have the potential to reveal links between the shelf seas and large-scale ocean circulation regimes when traced back to their origin. The northern North Sea for example as the main gateway for water-masses to one of Europe's largest shelf sea areas is largely supplied by water-masses from the open North Atlantic, a connection which can be seen from, e.g., sea surface salinity.

The aim of this study is to identify the origin of northern North Sea water-masses and distinguish pathway variability relative to the subpolar gyre regimes. This is done using Lagrangian trajectories, calculated using satellite-derived velocity fields. The results of the Lagrangian statistics mainly indicate that on inter-annual time-scales the North Atlantic subpolar gyre strength largely influences the water-masses found in the North Sea. The relation is found to originate from varying pathways and therefore origin. We conclude that on inter-annual time scales the subpolar gyre strength is a good proxy and skillful predictor of water-mass variability in the North Sea.

How to cite: Eisbrenner, E. and Chafik, L.: A satellite-based Lagrangian view on the origin of water-masses in the northern European shelf seas, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-2220, https://doi.org/10.5194/egusphere-egu21-2220, 2021.

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