2622 JOURNAL OF CLIMATE VOLUME 25 ENSO and Pacific Decadal Variability in the Community Climate System Model Version 4
This study presents an overview of the El Niño–Southern Oscillation (ENSO) phenomenon and Pacific decadal variability (PDV) simulated in a multicentury preindustrial control integration of the NCAR Community Climate System Model version 4 (CCSM4) at nominal 18 latitude–longitude resolution. Several...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.383.7030 2023-05-15T13:15:02+02:00 2622 JOURNAL OF CLIMATE VOLUME 25 ENSO and Pacific Decadal Variability in the Community Climate System Model Version 4 Clara Deser Adam S. Phillips Robert A. Tomas Yuko M. Okumura Michael A. Alexander Antonietta Capotondi James D. Scott The Pennsylvania State University CiteSeerX Archives 2011 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.7030 http://www.cgd.ucar.edu/cas/cdeser/Docs/deser.ccsm4ensopdv.jclim12.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.7030 http://www.cgd.ucar.edu/cas/cdeser/Docs/deser.ccsm4ensopdv.jclim12.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/deser.ccsm4ensopdv.jclim12.pdf text 2011 ftciteseerx 2016-09-18T00:28:24Z This study presents an overview of the El Niño–Southern Oscillation (ENSO) phenomenon and Pacific decadal variability (PDV) simulated in a multicentury preindustrial control integration of the NCAR Community Climate System Model version 4 (CCSM4) at nominal 18 latitude–longitude resolution. Several aspects of ENSO are improved in CCSM4 compared to its predecessor CCSM3, including the lengthened period (3–6 yr), the larger range of amplitude and frequency of events, and the longer duration of La Niña compared to El Niño. However, the overall magnitude of ENSO in CCSM4 is overestimated by;30%. The simulated ENSO exhibits characteristics consistent with the delayed/recharge oscillator paradigm, including correspondence between the lengthened period and increased latitudinal width of the anomalous equatorial zonal wind stress. Global seasonal atmospheric teleconnections with accompanying impacts on precipitation and temperature are generally well simulated, although the wintertime deepening of the Aleutian low erroneously persists into spring. The vertical structure of the upper-ocean temperature response to ENSO in the north and south Pacific displays a realistic seasonal evolution, with notable asymmetries between warm and cold events. The model shows evidence of atmospheric circulation precursors over the North Pacific associated with the ‘‘seasonal footprinting mechanism,’ ’ similar to observations. Simulated PDV exhibits a significant spectral peak around 15 yr, with generally realistic spatial pattern and magnitude. However, PDV linkages between the tropics and extratropics are weaker than observed. 1. Text aleutian low Unknown Pacific |
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description |
This study presents an overview of the El Niño–Southern Oscillation (ENSO) phenomenon and Pacific decadal variability (PDV) simulated in a multicentury preindustrial control integration of the NCAR Community Climate System Model version 4 (CCSM4) at nominal 18 latitude–longitude resolution. Several aspects of ENSO are improved in CCSM4 compared to its predecessor CCSM3, including the lengthened period (3–6 yr), the larger range of amplitude and frequency of events, and the longer duration of La Niña compared to El Niño. However, the overall magnitude of ENSO in CCSM4 is overestimated by;30%. The simulated ENSO exhibits characteristics consistent with the delayed/recharge oscillator paradigm, including correspondence between the lengthened period and increased latitudinal width of the anomalous equatorial zonal wind stress. Global seasonal atmospheric teleconnections with accompanying impacts on precipitation and temperature are generally well simulated, although the wintertime deepening of the Aleutian low erroneously persists into spring. The vertical structure of the upper-ocean temperature response to ENSO in the north and south Pacific displays a realistic seasonal evolution, with notable asymmetries between warm and cold events. The model shows evidence of atmospheric circulation precursors over the North Pacific associated with the ‘‘seasonal footprinting mechanism,’ ’ similar to observations. Simulated PDV exhibits a significant spectral peak around 15 yr, with generally realistic spatial pattern and magnitude. However, PDV linkages between the tropics and extratropics are weaker than observed. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Clara Deser Adam S. Phillips Robert A. Tomas Yuko M. Okumura Michael A. Alexander Antonietta Capotondi James D. Scott |
spellingShingle |
Clara Deser Adam S. Phillips Robert A. Tomas Yuko M. Okumura Michael A. Alexander Antonietta Capotondi James D. Scott 2622 JOURNAL OF CLIMATE VOLUME 25 ENSO and Pacific Decadal Variability in the Community Climate System Model Version 4 |
author_facet |
Clara Deser Adam S. Phillips Robert A. Tomas Yuko M. Okumura Michael A. Alexander Antonietta Capotondi James D. Scott |
author_sort |
Clara Deser |
title |
2622 JOURNAL OF CLIMATE VOLUME 25 ENSO and Pacific Decadal Variability in the Community Climate System Model Version 4 |
title_short |
2622 JOURNAL OF CLIMATE VOLUME 25 ENSO and Pacific Decadal Variability in the Community Climate System Model Version 4 |
title_full |
2622 JOURNAL OF CLIMATE VOLUME 25 ENSO and Pacific Decadal Variability in the Community Climate System Model Version 4 |
title_fullStr |
2622 JOURNAL OF CLIMATE VOLUME 25 ENSO and Pacific Decadal Variability in the Community Climate System Model Version 4 |
title_full_unstemmed |
2622 JOURNAL OF CLIMATE VOLUME 25 ENSO and Pacific Decadal Variability in the Community Climate System Model Version 4 |
title_sort |
2622 journal of climate volume 25 enso and pacific decadal variability in the community climate system model version 4 |
publishDate |
2011 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.7030 http://www.cgd.ucar.edu/cas/cdeser/Docs/deser.ccsm4ensopdv.jclim12.pdf |
geographic |
Pacific |
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Pacific |
genre |
aleutian low |
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aleutian low |
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http://www.cgd.ucar.edu/cas/cdeser/Docs/deser.ccsm4ensopdv.jclim12.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.7030 http://www.cgd.ucar.edu/cas/cdeser/Docs/deser.ccsm4ensopdv.jclim12.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766266594906865664 |