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Solar-induced versus internal variability in a coupled climate model

Solar-induced versus internal variability in a coupled climate model
Solar-induced versus internal variability in a coupled climate model
A series of experiments is conducted in which a variable solar irradiance is imposed for a range of frequencies and amplitudes in a simplified coupled General Circulation Model. For realistic amplitudes solar forcing dominates over internal variability in global mean surface air temperature (GM-SAT) beyond decadal timescales. Its impact increases with period up to 50 years. Evidence is found for interactions between climate variations with different timescales. A weak 22-yr solar irradiance variation excites a significant spectral peak with a 70-yr period in GM-SAT. On the regional-scale the internal variability dominates at all timescales. Patterns of internal variability and their associated variance are robust for a variable solar forcing. The temporal spectra, however, are sensitive to such forcing. Some preferred decadal timescales of the internal modes of the coupled system disappear when the solar forcing varies.
0094-8276
205-208
Drijfhout, S.S.
a5c76079-179b-490c-93fe-fc0391aacf13
Haarsma, R.J.
27e211fa-c98f-4511-89b5-3abcc393ac04
Opsteegh, J.D.
8935b518-6bc0-479c-9d7c-eb188fe52cf2
Selten, F.M.
aa3cc44a-08f4-46a6-836c-02a21fff0dea
Drijfhout, S.S.
a5c76079-179b-490c-93fe-fc0391aacf13
Haarsma, R.J.
27e211fa-c98f-4511-89b5-3abcc393ac04
Opsteegh, J.D.
8935b518-6bc0-479c-9d7c-eb188fe52cf2
Selten, F.M.
aa3cc44a-08f4-46a6-836c-02a21fff0dea

Drijfhout, S.S., Haarsma, R.J., Opsteegh, J.D. and Selten, F.M. (1999) Solar-induced versus internal variability in a coupled climate model. Geophysical Research Letters, 26 (2), 205-208. (doi:10.1029/1998GL900277).

Record type: Article

Abstract

A series of experiments is conducted in which a variable solar irradiance is imposed for a range of frequencies and amplitudes in a simplified coupled General Circulation Model. For realistic amplitudes solar forcing dominates over internal variability in global mean surface air temperature (GM-SAT) beyond decadal timescales. Its impact increases with period up to 50 years. Evidence is found for interactions between climate variations with different timescales. A weak 22-yr solar irradiance variation excites a significant spectral peak with a 70-yr period in GM-SAT. On the regional-scale the internal variability dominates at all timescales. Patterns of internal variability and their associated variance are robust for a variable solar forcing. The temporal spectra, however, are sensitive to such forcing. Some preferred decadal timescales of the internal modes of the coupled system disappear when the solar forcing varies.

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Published date: 15 January 1999
Organisations: Physical Oceanography

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Local EPrints ID: 349196
URI: http://eprints.soton.ac.uk/id/eprint/349196
ISSN: 0094-8276
PURE UUID: 8afe3386-d617-49bb-a304-fd304a69213b

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Date deposited: 26 Feb 2013 12:06
Last modified: 16 Jul 2019 21:42

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Contributors

Author: S.S. Drijfhout
Author: R.J. Haarsma
Author: J.D. Opsteegh
Author: F.M. Selten

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