Simulation of South-Asian summer monsoon in a GCM

Research output: Contribution to journalArticle

Abstract

Major characteristics of Indian summer monsoon climate are analyzed using simulations from the upgraded version of Florida State University Global Spectral Model (FSUGSM). The Indian monsoon has been studied in terms of mean precipitation and low-level and upper-level circulation patterns and compared with observations. In addition, the model's fidelity in simulating observed monsoon intraseasonal variability, interannual variability and teleconnection patterns is examined. The model is successful in simulating the major rainbelts over the Indian monsoon region. However, the model exhibits bias in simulating the precipitation bands over the South China Sea and the West Pacific region. Seasonal mean circulation patterns of low-level and upper-level winds are consistent with the model's precipitation pattern. Basic features like onset and peak phase of monsoon are realistically simulated. However, model simulation indicates an early withdrawal of monsoon. Northward propagation of rainbelts over the Indian continent is simulated fairly well, but the propagation is weak over the ocean. The model simulates the meridional dipole structure associated with the monsoon intraseasonal variability realistically. The model is unable to capture the observed interannual variability of monsoon and its teleconnection patterns. Estimate of potential predictability of the model reveals the dominating influence of internal variability over the Indian monsoon region.

Original languageEnglish (US)
Pages (from-to)2117-2140
Number of pages24
JournalPure and Applied Geophysics
Volume164
Issue number10
DOIs
StatePublished - Oct 2007

Keywords

  • Interannual variability
  • Intraseasonal variability
  • Monsoon
  • Predictability
  • Seasonal mean
  • Teleconnection

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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