期刊
INTERNATIONAL JOURNAL OF CLIMATOLOGY
卷 42, 期 5, 页码 2996-3006出版社
WILEY
DOI: 10.1002/joc.7403
关键词
Arabian Sea; cyclone-monsoon interaction; Indian summer monsoon; monsoon onset phase; tropical cyclone
资金
- Ministry of Earth Sciences, Government of India
- IITM HPC
Monsoon conditions in the Arabian Sea are generally unfavorable for cyclone formation, but cyclones can still form during the onset phase of the Indian summer monsoon. The study shows that a weakened monsoonal wind circulation caused by the southward intrusion of subtropical westerlies is conducive for cyclone formation in the Arabian Sea during the monsoon onset phase.
Generally, monsoon conditions are unfavourable for cyclogenesis in the Arabian Sea due to the strong vertical wind shear present over the basin which prevents the vertical development of cyclones. However, there are instances where tropical cyclones form over the basin during the onset phase of the Indian summer monsoon (ISM). The current study examines the evolution of the synoptic conditions in the years during 1979-2019 in which a cyclone forms during the onset phase of the ISM. The effect of various atmospheric and oceanic factors, the modulation of wind circulation over the Indian subcontinent and the north Indian Ocean region due to the possible influence of tropical and extratropical weather systems has been taken into consideration. Our analysis indicates that a weak mean monsoonal wind circulation caused by the southward intrusion of subtropical westerlies (at 200 hPa) is conducive for cyclogenesis over the Arabian Sea during the monsoon onset phase. Such a weak onset phase of the monsoon, coupled with the seasonal warm SSTs, may lead to cyclone formation in the Arabian Sea.
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