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Sensitivity of the LLN climate model to the astronomical and CO2 forcings over the last 200 ky

Sensitivity of the LLN climate model to the astronomical and CO2 forcings over the last 200 ky  The Louvain-la-Neuve climate model (here referred to as the LLN 2-D model has been used extensively to simulate the Northern Hemisphere ice volume under both the insolation and CO2 forcings. The period analysed here covers the last 200 ky. First, sensitivity analyses to constant CO2 concentration were performed. The model was accordingly forced by insolation changes only, the CO2 concentration being kept constant to respectively 210, 250 and 290 ppmv. Results show that the simulated ice volume variations are comparable to the geological reconstructions only when the CO2 concentration is low (210 ppmv) and that the sensitivity of the simulated Northern Hemisphere ice volume to CO2 is not constant through time. Second, three CO2 reconstructions were used to force the LLN 2-D model in addition to insolation. Results show (1) a better agreement with the SPECMAP oxygen isotope time series, in particular as far as the amplitude of the signal is concerned, and (2) that the simulated Northern Hemisphere ice volume is not very sensitive to the slight differences between these three reconstructions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Climate Dynamics Springer Journals

Sensitivity of the LLN climate model to the astronomical and CO2 forcings over the last 200 ky

Berger, A.; Loutre, M. F.; Gallée, H.
Climate Dynamics , Volume 14 (9) – Jul 29, 1998
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References (34)

Publisher
Springer Journals
Copyright
Copyright © 1998 by Springer-Verlag Berlin Heidelberg
Subject
Earth Sciences; Geophysics/Geodesy; Climatology; Oceanography
ISSN
0930-7575
eISSN
1432-0894
DOI
10.1007/s003820050245
Publisher site
See Article on Publisher Site

Abstract

 The Louvain-la-Neuve climate model (here referred to as the LLN 2-D model has been used extensively to simulate the Northern Hemisphere ice volume under both the insolation and CO2 forcings. The period analysed here covers the last 200 ky. First, sensitivity analyses to constant CO2 concentration were performed. The model was accordingly forced by insolation changes only, the CO2 concentration being kept constant to respectively 210, 250 and 290 ppmv. Results show that the simulated ice volume variations are comparable to the geological reconstructions only when the CO2 concentration is low (210 ppmv) and that the sensitivity of the simulated Northern Hemisphere ice volume to CO2 is not constant through time. Second, three CO2 reconstructions were used to force the LLN 2-D model in addition to insolation. Results show (1) a better agreement with the SPECMAP oxygen isotope time series, in particular as far as the amplitude of the signal is concerned, and (2) that the simulated Northern Hemisphere ice volume is not very sensitive to the slight differences between these three reconstructions.

Journal

Climate Dynamics – Springer Journals

Published: Jul 29, 1998

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