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Some aspects of an early summer monsoon onset over Andaman Sea and further progress towards the Indian mainland

Nair, S and Mahajan, PN (2010) Some aspects of an early summer monsoon onset over Andaman Sea and further progress towards the Indian mainland. Meteorology and Atmospheric Physics, 109 (1). pp. 19-31.

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Abstract

This work addresses the mechanisms that leads to an early onset of monsoon over Andaman Sea but advances further rapidly (slowly) to the Indian mainland resulting in the early (delayed) onset over Kerala. The upper tropospheric temperature, production of kinetic energy (KE) and outgoing long wave radiation (OLR) from the month of May till onset over Kerala are analysed for two delayed onset years (1997, 1995) and two early onset years (2004, 1990). It is observed that the maximum temperature over Tibetan plateau (TP), an increase in the production of KE and strong equatorial convection in early May, is associated with early onset over Andaman Sea. However, when there is a lull in advance of monsoon after the early onset over Andaman Sea, shifting of the warm region south of TP, weak production of KE in the lower troposphere and convective region shifting to Western Pacific resulted in the delayed onset over Kerala in 1997 and 1995. During the early onset years viz. 2004 and 1990, the warm region moving westwards, high production of KE extending to mid troposphere and deep convection moving westwards in the north Indian Ocean (10-15°N) is noticed.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer.
Uncontrolled Keywords: air temperature; atmospheric convection; kinetic energy; longwave radiation; monsoon; regional climate; summer; troposphere, Andaman Sea; India; Indian Ocean; Kerala
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 29 Oct 2014 10:52
Last Modified: 29 Oct 2014 10:52
URI: http://moeseprints.incois.gov.in/id/eprint/833

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