The Effect of Orbital Forcing on the Mean Climate and Variability of the Tropical Pacific
Using a coupled general circulation model, the responses of the climate mean state, the annual cycle, and the El Niño–Southern Oscillation (ENSO) phenomenon to orbital changes are studied. The authors analyze a 1650-yr-long simulation with accelerated orbital forcing, representing the period from 14...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.145.5041 2023-05-15T16:40:54+02:00 The Effect of Orbital Forcing on the Mean Climate and Variability of the Tropical Pacific A. Timmermann S. J. Lorenz S. -i. An A. Clement S. -p. Xie The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.145.5041 http://iprc.soest.hawaii.edu/~xie/axel-orbit-07.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.145.5041 http://iprc.soest.hawaii.edu/~xie/axel-orbit-07.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://iprc.soest.hawaii.edu/~xie/axel-orbit-07.pdf text 2005 ftciteseerx 2016-01-07T15:07:31Z Using a coupled general circulation model, the responses of the climate mean state, the annual cycle, and the El Niño–Southern Oscillation (ENSO) phenomenon to orbital changes are studied. The authors analyze a 1650-yr-long simulation with accelerated orbital forcing, representing the period from 142 000 yr B.P. (before present) to 22 900 yr A.P. (after present). The model simulation does not include the time-varying boundary conditions due to ice sheet and greenhouse gas forcing. Owing to the mean seasonal cycle of cloudiness in the off-equatorial regions, an annual mean precessional signal of temperatures is generated outside the equator. The resulting meridional SST gradient in the eastern equatorial Pacific modulates the annual mean meridional asymmetry and hence the strength of the equatorial annual cycle. In turn, changes of the equatorial annual cycle trigger abrupt changes of ENSO variability via frequency entrainment, resulting in an anticorrelation between annual cycle strength and ENSO amplitude on precessional time scales. 1. Text Ice Sheet Unknown Pacific |
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English |
description |
Using a coupled general circulation model, the responses of the climate mean state, the annual cycle, and the El Niño–Southern Oscillation (ENSO) phenomenon to orbital changes are studied. The authors analyze a 1650-yr-long simulation with accelerated orbital forcing, representing the period from 142 000 yr B.P. (before present) to 22 900 yr A.P. (after present). The model simulation does not include the time-varying boundary conditions due to ice sheet and greenhouse gas forcing. Owing to the mean seasonal cycle of cloudiness in the off-equatorial regions, an annual mean precessional signal of temperatures is generated outside the equator. The resulting meridional SST gradient in the eastern equatorial Pacific modulates the annual mean meridional asymmetry and hence the strength of the equatorial annual cycle. In turn, changes of the equatorial annual cycle trigger abrupt changes of ENSO variability via frequency entrainment, resulting in an anticorrelation between annual cycle strength and ENSO amplitude on precessional time scales. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
A. Timmermann S. J. Lorenz S. -i. An A. Clement S. -p. Xie |
spellingShingle |
A. Timmermann S. J. Lorenz S. -i. An A. Clement S. -p. Xie The Effect of Orbital Forcing on the Mean Climate and Variability of the Tropical Pacific |
author_facet |
A. Timmermann S. J. Lorenz S. -i. An A. Clement S. -p. Xie |
author_sort |
A. Timmermann |
title |
The Effect of Orbital Forcing on the Mean Climate and Variability of the Tropical Pacific |
title_short |
The Effect of Orbital Forcing on the Mean Climate and Variability of the Tropical Pacific |
title_full |
The Effect of Orbital Forcing on the Mean Climate and Variability of the Tropical Pacific |
title_fullStr |
The Effect of Orbital Forcing on the Mean Climate and Variability of the Tropical Pacific |
title_full_unstemmed |
The Effect of Orbital Forcing on the Mean Climate and Variability of the Tropical Pacific |
title_sort |
effect of orbital forcing on the mean climate and variability of the tropical pacific |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.145.5041 http://iprc.soest.hawaii.edu/~xie/axel-orbit-07.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
http://iprc.soest.hawaii.edu/~xie/axel-orbit-07.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.145.5041 http://iprc.soest.hawaii.edu/~xie/axel-orbit-07.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766031331348709376 |