Climatic Change

, Volume 110, Issue 1–2, pp 315–346 | Cite as

ENSO anomalies over the Western United States: present and future patterns in regional climate simulations

  • Yongxin ZhangEmail author
  • Yun Qian
  • Valérie Dulière
  • Eric P. SalathéJr
  • L. Ruby Leung


Surface temperature, precipitation, specific humidity and wind anomalies associated with the warm and cold phases of ENSO simulated by WRF and HadRM are examined for the present and future decades. WRF is driven by ECHAM5 and CCSM3, respectively, and HadRM is driven by HadCM3. For the current decades, all simulations show some capability in resolving the observed warm-dry and cool-wet teleconnection patterns over the PNW and the Southwest U.S. for warm and cold ENSO. Differences in the regional simulations originate primarily from the respective driving fields. For the future decades, the warm-dry and cool-wet teleconnection patterns in association with ENSO are still represented in ECHAM5-WRF and HadRM. However, there are indications of changes in the ENSO teleconnection patterns for CCSM3-WRF in the future, with wet anomalies dominating in the PNW and the Southwest U.S. for both warm and cold ENSO, in contrast to the canonical patterns of precipitation anomalies. Interaction of anomalous wind flow with local terrain plays a critical role in the generation of anomalous precipitation over the western U.S. Anomalous dry conditions are always associated with anomalous airflow that runs parallel to local mountains and wet conditions with airflow that runs perpendicular to local mountains. Future changes in temperature and precipitation associated with the ENSO events in the regional simulations indicate varying responses depending on the variables examined as well as depending on the phase of ENSO.


Precipitation Anomaly Wind Anomaly ENSO Event Snow Water Equivalent Teleconnection Pattern 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Yongxin Zhang
    • 1
    Email author
  • Yun Qian
    • 2
  • Valérie Dulière
    • 3
  • Eric P. SalathéJr
    • 4
  • L. Ruby Leung
    • 2
  1. 1.Research Applications LaboratoryNational Center for Atmospheric ResearchBoulderUSA
  2. 2.Atmospheric Sciences and Global Change DivisionPacific Northwest National LaboratoryRichlandUSA
  3. 3.Management Unit of the North Sea Mathematical Models, Department VIRoyal Belgian Institute of Natural SciencesBrusselsBelgium
  4. 4.University of Washington Bothell and Climate Impacts Group, University of WashingtonSeattleUSA

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