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The impact of solar forcing on the variability in a coupled climate model

The impact of solar forcing on the variability in a coupled climate model
The impact of solar forcing on the variability in a coupled climate model
The impact of variations in solar irradiance on the variability of climate is still a topic of debate. Herein we assess the response of a coupled General Circulation Model (GCM) of intermediate complexity to an estimate of the solar variability since 1700 and to a series of idealized sinusoidal solar forcings. On the continental to global scale and averaged over periods longer than 30 years, the solar-induced variability dominates internal variability in the annual global mean surface air temperature. Locally and on the regional scale, the internal variability dominates. The dominant patterns of natural variability and explained variance are not affected by a variable solar forcing, the spectra however are sensitive. The control run shows a preferred decadal time scale of 18 year in a sea surface temperature mode associated with the North Atlantic Oscillation. The preferred decadal time scale disappears for a variable solar forcing. This is caused by small changes in oceanic circulation resulting in subsurface oceanic modes with modified structure and time scale.
0038-6308
287-294
Haarsma, R.J.
27e211fa-c98f-4511-89b5-3abcc393ac04
Drijfhout, S.S.
a5c76079-179b-490c-93fe-fc0391aacf13
Opsteegh, J.J.
f8161365-dd58-4658-9c41-66b468affe55
Selten, F.M.
aa3cc44a-08f4-46a6-836c-02a21fff0dea
Haarsma, R.J.
27e211fa-c98f-4511-89b5-3abcc393ac04
Drijfhout, S.S.
a5c76079-179b-490c-93fe-fc0391aacf13
Opsteegh, J.J.
f8161365-dd58-4658-9c41-66b468affe55
Selten, F.M.
aa3cc44a-08f4-46a6-836c-02a21fff0dea

Haarsma, R.J., Drijfhout, S.S., Opsteegh, J.J. and Selten, F.M. (2000) The impact of solar forcing on the variability in a coupled climate model. Space Science Reviews, 94 (1-2), 287-294. (doi:10.1023/A:1026735726622).

Record type: Article

Abstract

The impact of variations in solar irradiance on the variability of climate is still a topic of debate. Herein we assess the response of a coupled General Circulation Model (GCM) of intermediate complexity to an estimate of the solar variability since 1700 and to a series of idealized sinusoidal solar forcings. On the continental to global scale and averaged over periods longer than 30 years, the solar-induced variability dominates internal variability in the annual global mean surface air temperature. Locally and on the regional scale, the internal variability dominates. The dominant patterns of natural variability and explained variance are not affected by a variable solar forcing, the spectra however are sensitive. The control run shows a preferred decadal time scale of 18 year in a sea surface temperature mode associated with the North Atlantic Oscillation. The preferred decadal time scale disappears for a variable solar forcing. This is caused by small changes in oceanic circulation resulting in subsurface oceanic modes with modified structure and time scale.

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Published date: November 2000
Organisations: Physical Oceanography

Identifiers

Local EPrints ID: 352553
URI: https://eprints.soton.ac.uk/id/eprint/352553
ISSN: 0038-6308
PURE UUID: e7f4b2d1-7e66-4423-9a15-dec5cf46b4c7

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Date deposited: 15 May 2013 13:02
Last modified: 18 Jul 2017 04:13

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