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    ENSO and Pacific decadal variability in the Community Climate System Model Version 4

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    jcli-d-11-00301%2E1.pdf (19.06Mb)
    Date
    2012-04-15
    Author
    Deser, Clara  Concept link
    Phillips, Adam S.  Concept link
    Tomas, Robert A.  Concept link
    Okumura, Yuko M.  Concept link
    Alexander, Michael A.  Concept link
    Capotondi, Antonietta  Concept link
    Scott, James D.  Concept link
    Kwon, Young-Oh  Concept link
    Ohba, Masamichi  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5176
    As published
    https://doi.org/10.1175/JCLI-D-11-00301.1
    DOI
    10.1175/JCLI-D-11-00301.1
    Keyword
     Atmosphere-ocean interaction; El Nino; ENSO; La Nina; Pacific decadal oscillation; Climate models 
    Abstract
    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 1° 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.
    Description
    Author Posting. © American Meteorological Society, 2012. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 25 (2012): 2622–2651, doi:10.1175/JCLI-D-11-00301.1.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Article: Deser, Clara, Phillips, Adam S., Tomas, Robert A., Okumura, Yuko M., Alexander, Michael A., Capotondi, Antonietta, Scott, James D., Kwon, Young-Oh, Ohba, Masamichi, "ENSO and Pacific decadal variability in the Community Climate System Model Version 4", Journal of Climate 25 (2012): 2622–2651, DOI:10.1175/JCLI-D-11-00301.1, https://hdl.handle.net/1912/5176
     

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