Early prediction of onset of south west monsoon from ERS-1 scatterometer winds

Details Early prediction of onset of south west monsoon from ERS-1 scatterometer winds Early prediction of onset of south west monsoon from ERS-1 scatterometer winds

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ineps.107...33r&link_type=abstract

Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, Volume 107, Issue 1, pp.33-43

Other

Monsoon Prediction, Cross Equatorial Winds, Ocean Surface Winds, Scatterometer

Scientific paper

Detailed analysis of the surface winds over the Indian Ocean derived from ERS-1 scatterometer data during the years 1993 and 1994 has been used to understand and unambiguously identify the onset phase of south-west monsoon. Five day (pentad) averaged wind vectors for the period April to June during both years have been examined to study the exact reversal of wind direction as well as the increase in wind speed over the Arabian Sea in relation to the onset of monsoon over the Indian west coast (Kerala). The related upper level humidity available from other satellites has also been analysed. The results of our analysis clearly show a consistent dramatic reversal in wind direction over the western Arabian Sea three weeks in advance of the onset of monsoon. The wind speed shows a large increase coinciding with the onset of monsoon. These findings together show the dominant role of sea surface winds in establishing the monsoon circulation. The study confirms that the cross equatorial current phenomenon becomes more important after the onset of monsoon.

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