Open AccessWithdrawal of the Indian summer monsoon and its Relation to the seasonal transition from summer To autumn over east Asia
Author(s) -
Jun Matsumoto
Publication year - 1990
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v41i2.2531
Subject(s) - westerlies , climatology , monsoon , plateau (mathematics) , subtropics , indian subcontinent , geography , south asia , subtropical ridge , jet stream , east asia , monsoon of south asia , east asian monsoon , indian ocean , geology , oceanography , meteorology , jet (fluid) , precipitation , china , history , ancient history , mathematical analysis , physics , mathematics , archaeology , fishery , biology , thermodynamics
The time evolution of the large-scale circulation over south Asia during the withdrawal phase of the Indian summer monsoon from August to November is examined for the years from 1979 to 1984 using FGGE Level III-b and ECMWF operational analysis data. During the withdrawal of the Indian summer monsoon, three distinct stages of abrupt transitions are recognized. The southward shift of 200 mb subtropical Jet stream round the Tibetan plateau, weakening of 850 rob westerlies around the Indian subcontinent, decrease of rainfall the west coast of India, and/or sharp drop of 300 rob zonal mean temperature over the Eurasian continent occur almost simultaneously associated with these transitions.