A Model Study of the Time Evolution of Climate At the Secular Time-scale
Numerical experiments are carried out with a two-dimensional zonally averaged climate model in order to investigate the transient response of the climate of the Northern Hemisphere to the solar and greenhouse-gas forcings at the secular time scale. The atmospheric component of the model is based on...
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Centro Ciencias Atmosfera Unam
1993
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:49496 2024-05-12T08:10:55+00:00 A Model Study of the Time Evolution of Climate At the Secular Time-scale Smits, Isabelle Fichefet, Thierry Tricot, C. van Ypersele de Strihou, Jean-Pascal UCL - SC/PHYS - Département de physique 1993 http://hdl.handle.net/2078.1/49496 eng eng Centro Ciencias Atmosfera Unam boreal:49496 http://hdl.handle.net/2078.1/49496 urn:ISSN:0187-6236 info:eu-repo/semantics/openAccess Atmosfera, Vol. 6, no. 4, p. 255-272 (1993) info:eu-repo/semantics/article 1993 ftunistlouisbrus 2024-04-18T18:12:56Z Numerical experiments are carried out with a two-dimensional zonally averaged climate model in order to investigate the transient response of the climate of the Northern Hemisphere to the solar and greenhouse-gas forcings at the secular time scale. The atmospheric component of the model is based on the two-level quasi-geostrophic potential vorticity system of equations. At the surface, the model has land-sea resolution and incorporates detailed snow and sea-ice mass budgets. The upper ocean is represented by an integral mixed-layer model in which meridional convergence of heat is parameterized by a diffusive law. For the simulation of the transient response of climate to continuously changing forcings, the uptake of heat perturbations by the deep ocean is approximated as vertical diffusion. A comparison between the computed and observed present climates shows that the model does reasonably well in simulating the seasonal cycle of various climatic variables. In the experiments performed here, we consider the solar irradiance changes, parameterized from recent satellite observations using the Wolf number as a basis, as well as the variations in solar radiation caused by the changes in the Earth's orbital elements. The former induces in our model a warming of about 0.005 K between the time intervals 1765-1875 and 1876-1990, while the latter is responsible for a cooling of about 0.003 K. These changes appear weak compared to the greenhouse-gas-induced warming simulated by the model. Article in Journal/Newspaper Sea ice DIAL@USL-B (Université Saint-Louis, Bruxelles) |
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Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
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ftunistlouisbrus |
language |
English |
description |
Numerical experiments are carried out with a two-dimensional zonally averaged climate model in order to investigate the transient response of the climate of the Northern Hemisphere to the solar and greenhouse-gas forcings at the secular time scale. The atmospheric component of the model is based on the two-level quasi-geostrophic potential vorticity system of equations. At the surface, the model has land-sea resolution and incorporates detailed snow and sea-ice mass budgets. The upper ocean is represented by an integral mixed-layer model in which meridional convergence of heat is parameterized by a diffusive law. For the simulation of the transient response of climate to continuously changing forcings, the uptake of heat perturbations by the deep ocean is approximated as vertical diffusion. A comparison between the computed and observed present climates shows that the model does reasonably well in simulating the seasonal cycle of various climatic variables. In the experiments performed here, we consider the solar irradiance changes, parameterized from recent satellite observations using the Wolf number as a basis, as well as the variations in solar radiation caused by the changes in the Earth's orbital elements. The former induces in our model a warming of about 0.005 K between the time intervals 1765-1875 and 1876-1990, while the latter is responsible for a cooling of about 0.003 K. These changes appear weak compared to the greenhouse-gas-induced warming simulated by the model. |
author2 |
UCL - SC/PHYS - Département de physique |
format |
Article in Journal/Newspaper |
author |
Smits, Isabelle Fichefet, Thierry Tricot, C. van Ypersele de Strihou, Jean-Pascal |
spellingShingle |
Smits, Isabelle Fichefet, Thierry Tricot, C. van Ypersele de Strihou, Jean-Pascal A Model Study of the Time Evolution of Climate At the Secular Time-scale |
author_facet |
Smits, Isabelle Fichefet, Thierry Tricot, C. van Ypersele de Strihou, Jean-Pascal |
author_sort |
Smits, Isabelle |
title |
A Model Study of the Time Evolution of Climate At the Secular Time-scale |
title_short |
A Model Study of the Time Evolution of Climate At the Secular Time-scale |
title_full |
A Model Study of the Time Evolution of Climate At the Secular Time-scale |
title_fullStr |
A Model Study of the Time Evolution of Climate At the Secular Time-scale |
title_full_unstemmed |
A Model Study of the Time Evolution of Climate At the Secular Time-scale |
title_sort |
model study of the time evolution of climate at the secular time-scale |
publisher |
Centro Ciencias Atmosfera Unam |
publishDate |
1993 |
url |
http://hdl.handle.net/2078.1/49496 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Atmosfera, Vol. 6, no. 4, p. 255-272 (1993) |
op_relation |
boreal:49496 http://hdl.handle.net/2078.1/49496 urn:ISSN:0187-6236 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1798854465723301888 |