Increasing Trend of "Break-Monsoon" Conditions Over India-Role of Ocean-Atmosphere Processes in the Indian Ocean

Analysis of daily rainfall data over India during the period 1951-2007 reveal an increased propensity in the occurrence of ldquomonsoon-breaksrdquo over the subcontinent. The increasing trend is seen both in the duration and frequency of monsoon-breaks over the subcontinent, the causes for which are...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2009-04, Vol.6 (2), p.332-336
Main Authors: Ramesh Kumar, M.R., Krishnan, R., Sankar, S., Unnikrishnan, A.S., Pai, D.S.
Format: Article
Language:English
Subjects:
Circulation
Equatorial Indian Ocean (IO) sea surface temperature (SST) warming trend
Feedback
Frequency
Indian
Indian monsoon
Indian Ocean
Large scale integration
Marine
Meteorology
Moisture
Monsoons
Ocean temperature
Satellites
Sea surface
Sea surface temperature
Summer
Transport
Trends
trends in "monsoon-breaks"
Wind
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Summary:Analysis of daily rainfall data over India during the period 1951-2007 reveal an increased propensity in the occurrence of ldquomonsoon-breaksrdquo over the subcontinent. The increasing trend is seen both in the duration and frequency of monsoon-breaks over the subcontinent, the causes for which are investigated using in situ , satellite, and reanalysis data products. While noting that the increasing trend of break-monsoon conditions is consistently related to changes in large-scale monsoon circulation and vertically integrated moisture transport; the findings also point to the role of sea surface temperature (SST) warming trend (0.015 deg C middotyear -1 ) in the tropical eastern Indian Ocean (IO) in inducing anomalous changes favorable for the increased propensity of monsoon-breaks. The results indicate that the SST warming in the tropical eastern IO has altered the ocean-atmosphere processes in a manner as to intensify the near-equatorial trough over the IO, but has led to a weakening of the southwest summer monsoon flow in recent decades into the Indian landmass.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2009.2013366