Simulation of South-Asian Summer Monsoon in a GCM |
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Authors: | R S Ajayamohan |
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Institution: | (1) FRCGC, Japan Agency for Marine Earth-Science and Technology, Yokohama, Japan |
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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. |
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Keywords: | Monsoon seasonal mean intraseasonal variability interannual variability teleconnection predictability |
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