Intraseasonal to Interannaul Variability of the Asian-Australian Monsoon
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概要
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During Summer Monsoon, a Low Level Jet (LLJ) exists in the Indian Ocean. The LLJ is best manifested at 850 mb (nearly 1.5 km above from the sea level) and it emantes from the Mascarene High and crosses the equator hugging the East African high lands and then turns to the Arabian Sea and extends further eastwards crossing India. Though the jet axis is nearly stable in the western Indian Ocean, over the peninsular India, the jet is subjected to north-south displacement. Such displacements (caused by the north-south displacements of the convective heating zones of the summer monsoon circulation) are responsible for the active and break phases in the monsoon precipitation over India. The work carried out by Dr. Thadathil is pertaining to the variability of the coastal winds of India caused by the LLJ during the active and break phases of the monsoon.