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Inter-annual to decadal sea-level variability in the coastal zones of the Norwegian and Siberian Seas: The role of atmospheric forcing

Inter-annual to decadal sea-level variability in the coastal zones of the Norwegian and Siberian Seas: The role of atmospheric forcing
Inter-annual to decadal sea-level variability in the coastal zones of the Norwegian and Siberian Seas: The role of atmospheric forcing
Inter-annual to decadal sea-level variations from tide gauge records in the coastal zones of the Norwegian and Siberian Seas are examined for the period 1950–2010 using a combination of hydrographic observations, wind data, and theory. We identify two large areas of highly coherent sea-level variability: one that includes the Norwegian, Barents, and Kara Seas, and another one that includes the Laptev, East Siberian, and Chukchi Seas. We provide evidence of a new contribution to the sea-level variability along the Norwegian coast associated with the poleward propagation of sea-level fluctuations along the eastern boundary of the North Atlantic. When this propagating signal is combined with the local wind, we are able to explain over 70% of the variance along the Norwegian coast. The steric component explains ~61% of the sea-level (corrected for the inverse barometer) variability along the Norwegian coast. The high coherency between the sea level along the Norwegian coast and that in the Barents and Kara Seas suggests that part of the Norwegian signal propagates further north into these regions. We introduce an atmospheric vorticity index that explains much of the sea-level variability in the Laptev, East Siberian, and Chukchi Seas with correlations ranging from 0.73 to 0.81. In the East Siberian Sea, we identify a sea-level increase of ~22?cm between 2000 and 2003, which is partly explained by the vorticity index, and a decline of ~15?cm after 2003, which we relate to the strengthening of the Beaufort Gyre.
Sea level, Tide gauge, Norwegian coast, Arctic, Atmospheric forcing, Beaufort Gyre
0148-0227
1287-1301
Calafat, F.M.
7c43d62a-c376-446c-93b4-87d4c1bd9d05
Chambers, D.P.
a27129a4-fcbb-4b56-96d4-a285ac7a23f6
Tsimplis, M.N.
df6dd749-cda4-46ec-983c-bf022d737031
Calafat, F.M.
7c43d62a-c376-446c-93b4-87d4c1bd9d05
Chambers, D.P.
a27129a4-fcbb-4b56-96d4-a285ac7a23f6
Tsimplis, M.N.
df6dd749-cda4-46ec-983c-bf022d737031

Calafat, F.M., Chambers, D.P. and Tsimplis, M.N. (2013) Inter-annual to decadal sea-level variability in the coastal zones of the Norwegian and Siberian Seas: The role of atmospheric forcing. Journal of Geophysical Research, 118 (3), 1287-1301. (doi:10.1002/jgrc.20106).

Record type: Article

Abstract

Inter-annual to decadal sea-level variations from tide gauge records in the coastal zones of the Norwegian and Siberian Seas are examined for the period 1950–2010 using a combination of hydrographic observations, wind data, and theory. We identify two large areas of highly coherent sea-level variability: one that includes the Norwegian, Barents, and Kara Seas, and another one that includes the Laptev, East Siberian, and Chukchi Seas. We provide evidence of a new contribution to the sea-level variability along the Norwegian coast associated with the poleward propagation of sea-level fluctuations along the eastern boundary of the North Atlantic. When this propagating signal is combined with the local wind, we are able to explain over 70% of the variance along the Norwegian coast. The steric component explains ~61% of the sea-level (corrected for the inverse barometer) variability along the Norwegian coast. The high coherency between the sea level along the Norwegian coast and that in the Barents and Kara Seas suggests that part of the Norwegian signal propagates further north into these regions. We introduce an atmospheric vorticity index that explains much of the sea-level variability in the Laptev, East Siberian, and Chukchi Seas with correlations ranging from 0.73 to 0.81. In the East Siberian Sea, we identify a sea-level increase of ~22?cm between 2000 and 2003, which is partly explained by the vorticity index, and a decline of ~15?cm after 2003, which we relate to the strengthening of the Beaufort Gyre.

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More information

Published date: 2013
Keywords: Sea level, Tide gauge, Norwegian coast, Arctic, Atmospheric forcing, Beaufort Gyre
Organisations: Marine Physics and Ocean Climate

Identifiers

Local EPrints ID: 352424
URI: https://eprints.soton.ac.uk/id/eprint/352424
ISSN: 0148-0227
PURE UUID: 9fa6cc39-6752-4522-bd87-f459df41fb9f

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Date deposited: 13 May 2013 14:23
Last modified: 18 Jul 2017 04:14

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