Global features of upper-tropospheric zonal wind and thermal fields during anomalous monsoon situations |
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| Authors: | L S Hingane S D Patil K Rupa Kumar |
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| Institution: | (1) Indian Institute of Tropical Meteorology, 411005 Pune, India |
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| Abstract: | Global analyses of mean monthly zonal wind component and temperature at 200, 150 and 100 mb levels have been made for the
region between 60°N and 60°S, for the months May through September during two poor monsoon years (1972 and 1979) and a good
monsoon year (1975). Prominent and consistent contrasting features of the zonal wind and thermal fields have been identified,
with reference to the monsoon performance over India. It has been noticed that the areal spreading of easterlies over the
tropics and extratropics is significantly more during a good monsoon year. Shifting of the axis of the tropical easterly jet
stream to a higher level and generally stronger easterlies also characterize good monsoon activity. The upper troposphere
has been found to be considerably cooler during poor monsoon years. |
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| Keywords: | Southwest monsoon drought upper troposphere zonal winds |
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