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Sea level changes in the North Atlantic by solar forcing and internal variability

Sea level changes in the North Atlantic by solar forcing and internal variability
Sea level changes in the North Atlantic by solar forcing and internal variability
Sea level change due to variations in the thermohaline structure of the North Atlantic has been calculated using a coupled ocean–atmosphere model of intermediate complexity (ECBilt). Two 1000-year simulations are made, one using a constant solar forcing and one using an estimate of historic variations in solar activity. In the solar forced simulation sea level variations are a proxy for climate variations. Anomalies in sea surface temperature (SST) of the northern North Atlantic are generated by the solar radiation changes. These SST anomalies modulate the ocean thermohaline circulation (THC), affecting surface salinities in the northern North Atlantic which are subsequently advected to the deep ocean. The associated deep ocean geopotential thickness anomalies dominate sea level in the North Atlantic and are advected southwards with the overturning circulation. Sea level change in the solar forced simulation is primarily an indirect response to solar radiation changes, which modulate the THC. In the unforced run, changes in the THC affect sea level in a similar way. However, in this simulation THC variability is no longer generated by sea surface temperature variations but by sea surface salinity variations, resulting from internal climate dynamics. The present results will aid in analyses of reconstructed low-frequency sea-level variations based on proxy data.
0930-7575
435-447
van der Schrier, G.
75cad588-0db4-4ce1-b72a-4ea8db80ac63
Weber, S.
1259c0da-69f3-4a00-b491-70e9ef767547
Drijfhout, S.
a5c76079-179b-490c-93fe-fc0391aacf13
van der Schrier, G.
75cad588-0db4-4ce1-b72a-4ea8db80ac63
Weber, S.
1259c0da-69f3-4a00-b491-70e9ef767547
Drijfhout, S.
a5c76079-179b-490c-93fe-fc0391aacf13

van der Schrier, G., Weber, S. and Drijfhout, S. (2002) Sea level changes in the North Atlantic by solar forcing and internal variability. Climate Dynamics, 19 (5-6), 435-447. (doi:10.1007/s00382-002-0235-y).

Record type: Article

Abstract

Sea level change due to variations in the thermohaline structure of the North Atlantic has been calculated using a coupled ocean–atmosphere model of intermediate complexity (ECBilt). Two 1000-year simulations are made, one using a constant solar forcing and one using an estimate of historic variations in solar activity. In the solar forced simulation sea level variations are a proxy for climate variations. Anomalies in sea surface temperature (SST) of the northern North Atlantic are generated by the solar radiation changes. These SST anomalies modulate the ocean thermohaline circulation (THC), affecting surface salinities in the northern North Atlantic which are subsequently advected to the deep ocean. The associated deep ocean geopotential thickness anomalies dominate sea level in the North Atlantic and are advected southwards with the overturning circulation. Sea level change in the solar forced simulation is primarily an indirect response to solar radiation changes, which modulate the THC. In the unforced run, changes in the THC affect sea level in a similar way. However, in this simulation THC variability is no longer generated by sea surface temperature variations but by sea surface salinity variations, resulting from internal climate dynamics. The present results will aid in analyses of reconstructed low-frequency sea-level variations based on proxy data.

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More information

Published date: August 2002
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 349183
URI: http://eprints.soton.ac.uk/id/eprint/349183
ISSN: 0930-7575
PURE UUID: 59905b5c-b11f-40a6-8398-e52c5a381da7

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Date deposited: 26 Feb 2013 11:43
Last modified: 08 Jan 2022 00:16

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Contributors

Author: G. van der Schrier
Author: S. Weber
Author: S. Drijfhout

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