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This study examines the contribution of tropical Sea Surface Temperature (SST) forcing to the 1976/1977 climate transition of the winter atmospheric circulation over the North Pacific using a combined observational and modeling approach. The National Center for Atmospheric Research (NCAR) Community...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.383.9022 2023-05-15T13:14:51+02:00 In press Corresponding Author: Clara Deser Adam S. Phillips Dr. Clara Deser The Pennsylvania State University CiteSeerX Archives 2006 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.9022 http://www.cgd.ucar.edu/cas/cdeser/Docs/jclim_7677trans.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.9022 http://www.cgd.ucar.edu/cas/cdeser/Docs/jclim_7677trans.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.cgd.ucar.edu/cas/cdeser/Docs/jclim_7677trans.pdf text 2006 ftciteseerx 2016-09-18T00:29:06Z This study examines the contribution of tropical Sea Surface Temperature (SST) forcing to the 1976/1977 climate transition of the winter atmospheric circulation over the North Pacific using a combined observational and modeling approach. The National Center for Atmospheric Research (NCAR) Community Atmospheric Model Version 3 (CAM3) simulates approximately 75 % of the observed 4 hPa deepening of the wintertime Aleutian Low from 1950-1976 to 1977-2000 when forced with the observed evolution of tropical SSTs in a 10-member ensemble average. This response is driven by precipitation increases over the western half of the equatorial Pacific Ocean. In contrast, the NCAR Community Climate Model Version 3 (CCM3), the predecessor to CAM3, simulates no significant change in the strength of the Aleutian Low when forced with the same tropical SSTs in a 12-member ensemble average. The lack of response in CCM3 is traced to an erroneously large precipitation increase over the tropical Indian Ocean whose dynamical impact is to weaken the Aleutian Low; this, when combined with the response to rainfall increases over the western and central equatorial Pacific, results in near-zero net change in the strength of the Aleutian Low. The observed distribution of tropical precipitation anomalies associated with the 1976/1977 transition, estimated from a combination of direct measurements at land stations and indirect information from surface marine cloudiness and wind divergence fields, supports the models ’ simulated rainfall increases over the western half of the Pacific but not the magnitude of CCM3’s rainfall increase over the Indian Ocean. 1 Text aleutian low Unknown Indian Pacific |
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This study examines the contribution of tropical Sea Surface Temperature (SST) forcing to the 1976/1977 climate transition of the winter atmospheric circulation over the North Pacific using a combined observational and modeling approach. The National Center for Atmospheric Research (NCAR) Community Atmospheric Model Version 3 (CAM3) simulates approximately 75 % of the observed 4 hPa deepening of the wintertime Aleutian Low from 1950-1976 to 1977-2000 when forced with the observed evolution of tropical SSTs in a 10-member ensemble average. This response is driven by precipitation increases over the western half of the equatorial Pacific Ocean. In contrast, the NCAR Community Climate Model Version 3 (CCM3), the predecessor to CAM3, simulates no significant change in the strength of the Aleutian Low when forced with the same tropical SSTs in a 12-member ensemble average. The lack of response in CCM3 is traced to an erroneously large precipitation increase over the tropical Indian Ocean whose dynamical impact is to weaken the Aleutian Low; this, when combined with the response to rainfall increases over the western and central equatorial Pacific, results in near-zero net change in the strength of the Aleutian Low. The observed distribution of tropical precipitation anomalies associated with the 1976/1977 transition, estimated from a combination of direct measurements at land stations and indirect information from surface marine cloudiness and wind divergence fields, supports the models ’ simulated rainfall increases over the western half of the Pacific but not the magnitude of CCM3’s rainfall increase over the Indian Ocean. 1 |
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The Pennsylvania State University CiteSeerX Archives |
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Clara Deser Adam S. Phillips Dr. Clara Deser |
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Clara Deser Adam S. Phillips Dr. Clara Deser In press Corresponding Author: |
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Clara Deser Adam S. Phillips Dr. Clara Deser |
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Clara Deser |
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2006 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.9022 http://www.cgd.ucar.edu/cas/cdeser/Docs/jclim_7677trans.pdf |
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Indian Pacific |
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Indian Pacific |
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aleutian low |
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aleutian low |
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http://www.cgd.ucar.edu/cas/cdeser/Docs/jclim_7677trans.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.9022 http://www.cgd.ucar.edu/cas/cdeser/Docs/jclim_7677trans.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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1766265751549771776 |