ENSO and Pacific Decadal Variability in Community Climate System Model Version 4

AMS Citation:
Deser, C., and Coauthors, 2012: ENSO and Pacific Decadal Variability in Community Climate System Model Version 4. Journal of Climate, 25, 2622-2651, doi:10.1175/JCLI-D-11-00301.1.
Date:2012-04-01
Resource Type:article
Title:ENSO and Pacific Decadal Variability in Community Climate System Model Version 4
Abstract: The study presents an overview of the El Nino/Southern Oscillation (ENSO) phenomenon and Pacific Decadal Variability (PDV) simulated in a multi-century pre-industrial control integration of the NCAR Community Climate System Model version 4 (CCSM4) at nominal 1 degree latitude/longitude resolution. Several aspects of ENSO are improved in CCSM4 compared to its predecessor CCSM3, including the lengthened period (3-6 years), the larger range of amplitude and frequency of events, and the longer duration of La Nina compared to El Nino. 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 15yr, with generally realistic spatial pattern and magnitude. However, PDV linkages between the tropics and extra-tropics are weaker than observed.
Peer Review:Refereed
Copyright Information:Copyright 2012 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work.
OpenSky citable URL: ark:/85065/d7nk3gkf
Publisher's Version: 10.1175/JCLI-D-11-00301.1
Author(s):
  • Clara Deser - NCAR/UCAR
  • Adam Phillips - NCAR/UCAR
  • Robert Tomas - NCAR/UCAR
  • Masamichi Ohba
  • Yuko Okumura - NCAR/UCAR
  • Michael Alexander
  • Antonietta Capotondi
  • James Scott
  • Young-Oh Kwon
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