Article Type:
Research Article

China's Rainfall Interannual Predictability: Dependence on the Annual Cycle and Surface Anomalies

Xin-Zhong Liang Illinois State Water Survey, Illinois Department of Natural Resources, Champaign, and University of Illinois at Urbana–Champaign, Urbana, Illinois

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Arthur N. Samel Geography/Environmental Programs, Bowling Green State University, Bowling Green, Ohio

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Wei-Chyung Wang Atmospheric Sciences Research Center, University at Albany, State University of New York, Albany, New York

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Print Publication:
01 Sep 2002
DOI:
https://doi.org/10.1175/1520-0442(2002)015<2555:CSRIPD>2.0.CO;2
Page(s):
2555–2561
Restricted access

Abstract

China's rainfall interannual predictability is generally believed to depend upon the accurate representation of its annual cycle as well as teleconnections with planetary surface anomalies, including tropical east Pacific sea surface temperature and Eurasian snow and soil moisture. A suite of general circulation model (GCM) simulations is used to ascertain the existence of these relationships. First, a comparison of thirty 1980–88 Atmospheric Model Intercomparison Project (AMIP) GCM simulations shows no clear correspondence between model skill to reproduce observed rainfall annual cycle and interannual variability. Thus, accurate representation of either component does not ensure the realistic simulation of the other. Second, diagnosis of the 1903–94 and 1950–97 National Center for Atmospheric Research (NCAR) Community Climate Model, version 3 (CCM3), ensemble integrations indicates the existence of teleconnections in which spring planetary surface anomalies lead China's summer rainfall variations. These teleconnections, however, are sensitive to initial conditions, which define distinct dynamic regimes during the integration period. In addition, analysis of the NCAR Climate System Model (CSM) 300-yr equilibrium simulation reveals that the teleconnections display decadal variations. These results cast doubt on the traditional physical mechanisms that explain China's rainfall teleconnections and, hence, emphasize the need to incorporate interactions between planetary surface anomalies and specific dynamic regimes.

Corresponding author address: Dr. Xin-Zhong Liang, Illinois State Water Survey, 2204 Griffith Dr., Champaign, IL 61820-7495. Email: xliang@uiuc.edu

Abstract

China's rainfall interannual predictability is generally believed to depend upon the accurate representation of its annual cycle as well as teleconnections with planetary surface anomalies, including tropical east Pacific sea surface temperature and Eurasian snow and soil moisture. A suite of general circulation model (GCM) simulations is used to ascertain the existence of these relationships. First, a comparison of thirty 1980–88 Atmospheric Model Intercomparison Project (AMIP) GCM simulations shows no clear correspondence between model skill to reproduce observed rainfall annual cycle and interannual variability. Thus, accurate representation of either component does not ensure the realistic simulation of the other. Second, diagnosis of the 1903–94 and 1950–97 National Center for Atmospheric Research (NCAR) Community Climate Model, version 3 (CCM3), ensemble integrations indicates the existence of teleconnections in which spring planetary surface anomalies lead China's summer rainfall variations. These teleconnections, however, are sensitive to initial conditions, which define distinct dynamic regimes during the integration period. In addition, analysis of the NCAR Climate System Model (CSM) 300-yr equilibrium simulation reveals that the teleconnections display decadal variations. These results cast doubt on the traditional physical mechanisms that explain China's rainfall teleconnections and, hence, emphasize the need to incorporate interactions between planetary surface anomalies and specific dynamic regimes.

Corresponding author address: Dr. Xin-Zhong Liang, Illinois State Water Survey, 2204 Griffith Dr., Champaign, IL 61820-7495. Email: xliang@uiuc.edu

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