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  Atlantic inflow to the North Sea modulated by the subpolar gyre in a historical simulation with MPI-ESM

Koul, V., Schrum, C., Düsterhus, A., & Baehr, J. (2019). Atlantic inflow to the North Sea modulated by the subpolar gyre in a historical simulation with MPI-ESM. Journal of Geophysical Research: Oceans, 124, 1807-1826. doi:10.1029/2018JC014738.

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Koul_et_al-2019-Journal_of_Geophysical_Research__Oceans.pdf (Publisher version), 6MB
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Koul, Vimal1, 2, Author
Schrum, C.2, Author
Düsterhus, A.2, Author
Baehr, J.2, Author
Affiliations:
1IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913547              
2Institute of Oceanography, University of Hamburg, ou_persistent22              

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 Abstract: While the influence of the subpolar gyre (SPG) on thermohaline variability in the eastern North Atlantic is well documented, the extent and timescale of the influence of the SPG on North Sea is not well understood. This is primarily because earlier investigations on the causes of variability in the North Sea water properties mostly focused on the role of atmosphere and deployed regional models. Here using a historical simulation with the Max Planck Institute Earth System Model (MPI-ESM), we investigate circulation and water mass variability in key regions, namely, the Rockall Trough and the Faroe-Scotland Channel, which link the North Atlantic to the North Sea. We find that salinity covaries with advective lags in these three regions and that the northern North Sea salinity follows the Rockall Trough with a lag of 1 year. We show that recurring and persistent excursions of salinity anomalies into the northern North Sea are related to the SPG strength and not to the local acceleration of the inflow. Furthermore, we illustrate that the SPG signal is more pronounced in salinity than in temperature and that this simulated SPG signal has a period of 30–40 years. Overall, our study suggests that, at low frequency, water mass variability originating in the North Atlantic dominates changes in the North Sea water properties over those due to local wind-driven volume transport. ©2019. American Geophysical Union. All Rights Reserved.

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Language(s): eng - English
 Dates: 2019-03-052019-042019-04
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2018JC014738
BibTex Citekey: Koul2019
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Title: Journal of Geophysical Research: Oceans
Source Genre: Journal
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Publ. Info: Blackwell Publishing Ltd
Pages: - Volume / Issue: 124 Sequence Number: - Start / End Page: 1807 - 1826 Identifier: ISSN: 21699275