2001: The importance of tropical sea surface temperature patterns in simulations of Last Glacial Maximum climate
Prescribed SST experiments are performed using the National Center for Atmospheric Research’s Community Climate Model version 3 general circulation model to isolate the contribution of the tropical SSTs reconstructed by the Climate, Long-range Investigation, Mapping and Prediction study (CLIMAP) to...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.588.9996 2023-05-15T16:13:06+02:00 2001: The importance of tropical sea surface temperature patterns in simulations of Last Glacial Maximum climate Jeffrey H. Yin David S. Battisti The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.588.9996 http://www.atmos.washington.edu/~david/yb2001.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.588.9996 http://www.atmos.washington.edu/~david/yb2001.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.atmos.washington.edu/~david/yb2001.pdf text ftciteseerx 2016-01-08T13:23:39Z Prescribed SST experiments are performed using the National Center for Atmospheric Research’s Community Climate Model version 3 general circulation model to isolate the contribution of the tropical SSTs reconstructed by the Climate, Long-range Investigation, Mapping and Prediction study (CLIMAP) to the modeled global atmospheric circulation anomalies at the Last Glacial Maximum (LGM). The changes in tropical SST patterns cause changes in tropical convection that force large (.300 m in 500-mb geopotential height) changes in Northern Hemisphere wintertime circulation. These midlatitude circulation changes occur despite the small (18C) change in the mean tropical SST between the present and the CLIMAP reconstruction. In fact, the midlatitude circulation changes due to the difference in the tropical SST pattern between the present and the CLIMAP reconstruction are greater than the circulation changes due to a uniform tropical SST cooling of 38C or those due to the presence of the LGM ice sheets. The circulation anomalies due to the change in tropical SST patterns result in a wintertime warming (cooling) of 88C (88C) over the Laurentide (Fennoscandian) ice sheet and a decrease (increase) in annual mass balance of over 1000 mm yr21 (800 mm yr21) along the southern margin of the ice sheet. These results demonstrate that detailed knowledge of tropical SST patterns is needed in order to produce reliable simulations of LGM climate. In the appendix, it is shown that the lion’s share of the midlatitude circulation changes are due to SST gradients in the northern Tropics, and that the physics involved in the teleconnection between tropical SST forcing and midlatitude circulation changes is rich and highly nonlinear. 1. Text Fennoscandian Ice Sheet Unknown |
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ftciteseerx |
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English |
description |
Prescribed SST experiments are performed using the National Center for Atmospheric Research’s Community Climate Model version 3 general circulation model to isolate the contribution of the tropical SSTs reconstructed by the Climate, Long-range Investigation, Mapping and Prediction study (CLIMAP) to the modeled global atmospheric circulation anomalies at the Last Glacial Maximum (LGM). The changes in tropical SST patterns cause changes in tropical convection that force large (.300 m in 500-mb geopotential height) changes in Northern Hemisphere wintertime circulation. These midlatitude circulation changes occur despite the small (18C) change in the mean tropical SST between the present and the CLIMAP reconstruction. In fact, the midlatitude circulation changes due to the difference in the tropical SST pattern between the present and the CLIMAP reconstruction are greater than the circulation changes due to a uniform tropical SST cooling of 38C or those due to the presence of the LGM ice sheets. The circulation anomalies due to the change in tropical SST patterns result in a wintertime warming (cooling) of 88C (88C) over the Laurentide (Fennoscandian) ice sheet and a decrease (increase) in annual mass balance of over 1000 mm yr21 (800 mm yr21) along the southern margin of the ice sheet. These results demonstrate that detailed knowledge of tropical SST patterns is needed in order to produce reliable simulations of LGM climate. In the appendix, it is shown that the lion’s share of the midlatitude circulation changes are due to SST gradients in the northern Tropics, and that the physics involved in the teleconnection between tropical SST forcing and midlatitude circulation changes is rich and highly nonlinear. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Jeffrey H. Yin David S. Battisti |
spellingShingle |
Jeffrey H. Yin David S. Battisti 2001: The importance of tropical sea surface temperature patterns in simulations of Last Glacial Maximum climate |
author_facet |
Jeffrey H. Yin David S. Battisti |
author_sort |
Jeffrey H. Yin |
title |
2001: The importance of tropical sea surface temperature patterns in simulations of Last Glacial Maximum climate |
title_short |
2001: The importance of tropical sea surface temperature patterns in simulations of Last Glacial Maximum climate |
title_full |
2001: The importance of tropical sea surface temperature patterns in simulations of Last Glacial Maximum climate |
title_fullStr |
2001: The importance of tropical sea surface temperature patterns in simulations of Last Glacial Maximum climate |
title_full_unstemmed |
2001: The importance of tropical sea surface temperature patterns in simulations of Last Glacial Maximum climate |
title_sort |
2001: the importance of tropical sea surface temperature patterns in simulations of last glacial maximum climate |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.588.9996 http://www.atmos.washington.edu/~david/yb2001.pdf |
genre |
Fennoscandian Ice Sheet |
genre_facet |
Fennoscandian Ice Sheet |
op_source |
http://www.atmos.washington.edu/~david/yb2001.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.588.9996 http://www.atmos.washington.edu/~david/yb2001.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1765998713144082432 |