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Air sea exchange of fluxes and Indian monsoon from satellite data

DRS at CSIR-National Institute of Oceanography

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Title Air sea exchange of fluxes and Indian monsoon from satellite data
 
Creator Muraleedharan, P.M.
Pankajakshan, T.
Sundaram, S.
 
Subject air-water exchanges
latent heat transfer
evaporation
el nino phenomena
southern oscillation
wind speed
rainfall
monsoon
satellite sensing
 
Description Latent heat flux (LHF) over the tropical Indian Ocean (25 N to 25 S: 35 degrees E to 120 degrees E) for ten years from 1988 were computed using bulk parameterization method by making use of both monthly and weekly values of Sea Surface Temperature (Reynolds), Sea Surface Wind Speed and Integrated water vapor (from SSMI sensor onboard DMSP satellite series), mean sea level pressure (from NCEP/NCAR reanalysis data). Evaporation zones are identified over the western tropical Indian Ocean where the southwest monsoon wind forcing is active. Weekly and monthly rainfall data over the 35 meteorological subdivisions identified by the Indian Meteorological Department were used to study the relationship between LHF over the ocean and Indian summer monsoon rainfall. Rainfall represented by both coastal and central sections accounts for 70-80% of the rainfall from all 35 subdivisions. High annual rainfall years (1988,1993-95,1997) matches very well with the warm phase of ENSO. Relatively better correlation exists between the LHF (over Arabian Sea and Southern Ocean) and rainfall when there is a time lag of 4 weeks. Trends of LHF anomaly over the southern ocean for the ten year period matches very well with the rainfall anomaly over the Indian peninsula in spite of the fact that the trend closely follows the warm phase of ENSO. High rainfall anomaly in the southern sector of the Indian peninsula in 1988-89 in July provides evidence of strong moisture transport due to the shifting of the axis of LLJ which normally associated with break monsoon condition. Similar condition prevails over the northern sector of the peninsula in 1997 and the absence of rainfall in the south is an indication of a single core structure of LLJ during an active monsoon condition. The winter evaporation and the subsequent rainfall over the Indian peninsula exhibits strong association with the cold phase of ENSO.
 
Date 2008-08-09T09:56:34Z
2008-08-09T09:56:34Z
2002
 
Type Conference Article
 
Identifier Proceedings of The Sixth Pan Ocean Remote Sensing Conference (PORSEC) Bali, 3-6 September 2002: Remote sensing and ocean science for marine resources exploration and environment. Vol. 2. eds. by: Pasaribu, B.P.; Kaswadji, R.; Nurjaya, I.W.; Gaol, J.L., 320-330p.
http://drs.nio.org/drs/handle/2264/1401
 
Language en
 
Publisher PORSEC 2002 Secretariat; Bogor; Indonesia