2004: Polar MM5 simulations of the winter climate of the Laurentide Ice Sheet at the LGM
Optimized regional climate simulations are conducted using the Polar MM5, a version of the fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5), with a 60-km horizontal resolution domain over North America during the Last Glacial Maximum (LGM, 21 000 calendar years ago), when mu...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.670.8949 2023-05-15T15:08:29+02:00 2004: Polar MM5 simulations of the winter climate of the Laurentide Ice Sheet at the LGM David H. Bromwich E. Richard Toracinta Robert J. Oglesby James L. Fastook Terence J. Hughes The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.670.8949 http://polarmet.osu.edu/PMG_publications/bromwich_toracinta_jc_2004.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.670.8949 http://polarmet.osu.edu/PMG_publications/bromwich_toracinta_jc_2004.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://polarmet.osu.edu/PMG_publications/bromwich_toracinta_jc_2004.pdf text ftciteseerx 2016-01-08T17:21:40Z Optimized regional climate simulations are conducted using the Polar MM5, a version of the fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5), with a 60-km horizontal resolution domain over North America during the Last Glacial Maximum (LGM, 21 000 calendar years ago), when much of the continent was covered by the Laurentide Ice Sheet (LIS). The objective is to describe the LGM annual cycle at high spatial resolution with an emphasis on the winter atmospheric circulation. Output from a tailored NCAR Community Climate Model version 3 (CCM3) simulation of the LGM climate is used to provide the initial and lateral boundary conditions for Polar MM5. LGM boundary conditions include continental ice sheets, appropriate orbital forcing, reduced CO2 concentration, paleovegetation, modified sea surface temperatures, and lowered sea level. Polar MM5 produces a substantially different atmospheric response to the LGM boundary conditions than CCM3 and other recent GCM simulations. In particular, from November to April the upper-level flow is split around a blocking anticyclone over the LIS, with a northern branch over the Canadian Arctic and a southern branch impacting southern North America. The split flow pattern is most pronounced in January and transitions into a single, consolidated jet stream that migrates northward over the LIS during summer. Sensitivity experiments indicate that the winter split flow in Polar MM5 is primarily due to mechanical forcing by LIS, although model Text Arctic Ice Sheet Unknown Arctic |
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English |
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Optimized regional climate simulations are conducted using the Polar MM5, a version of the fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5), with a 60-km horizontal resolution domain over North America during the Last Glacial Maximum (LGM, 21 000 calendar years ago), when much of the continent was covered by the Laurentide Ice Sheet (LIS). The objective is to describe the LGM annual cycle at high spatial resolution with an emphasis on the winter atmospheric circulation. Output from a tailored NCAR Community Climate Model version 3 (CCM3) simulation of the LGM climate is used to provide the initial and lateral boundary conditions for Polar MM5. LGM boundary conditions include continental ice sheets, appropriate orbital forcing, reduced CO2 concentration, paleovegetation, modified sea surface temperatures, and lowered sea level. Polar MM5 produces a substantially different atmospheric response to the LGM boundary conditions than CCM3 and other recent GCM simulations. In particular, from November to April the upper-level flow is split around a blocking anticyclone over the LIS, with a northern branch over the Canadian Arctic and a southern branch impacting southern North America. The split flow pattern is most pronounced in January and transitions into a single, consolidated jet stream that migrates northward over the LIS during summer. Sensitivity experiments indicate that the winter split flow in Polar MM5 is primarily due to mechanical forcing by LIS, although model |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
David H. Bromwich E. Richard Toracinta Robert J. Oglesby James L. Fastook Terence J. Hughes |
spellingShingle |
David H. Bromwich E. Richard Toracinta Robert J. Oglesby James L. Fastook Terence J. Hughes 2004: Polar MM5 simulations of the winter climate of the Laurentide Ice Sheet at the LGM |
author_facet |
David H. Bromwich E. Richard Toracinta Robert J. Oglesby James L. Fastook Terence J. Hughes |
author_sort |
David H. Bromwich |
title |
2004: Polar MM5 simulations of the winter climate of the Laurentide Ice Sheet at the LGM |
title_short |
2004: Polar MM5 simulations of the winter climate of the Laurentide Ice Sheet at the LGM |
title_full |
2004: Polar MM5 simulations of the winter climate of the Laurentide Ice Sheet at the LGM |
title_fullStr |
2004: Polar MM5 simulations of the winter climate of the Laurentide Ice Sheet at the LGM |
title_full_unstemmed |
2004: Polar MM5 simulations of the winter climate of the Laurentide Ice Sheet at the LGM |
title_sort |
2004: polar mm5 simulations of the winter climate of the laurentide ice sheet at the lgm |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.670.8949 http://polarmet.osu.edu/PMG_publications/bromwich_toracinta_jc_2004.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice Sheet |
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Arctic Ice Sheet |
op_source |
http://polarmet.osu.edu/PMG_publications/bromwich_toracinta_jc_2004.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.670.8949 http://polarmet.osu.edu/PMG_publications/bromwich_toracinta_jc_2004.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766339835875819520 |