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Role of Indian Ocean sea surface temperatures in modulating northwest Indian winter precipitation variability

机译：印度洋海面温度在调节西北印度冬季降水变化中的作用

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摘要

The interannual variability of North-West India Winter Precipitation (NWIWP) has been examined in association with the variability of sea surface temperature (SST), surface air temperature (SAT) and upper tropospheric (200 hPa) wind patterns over India and the surrounding regions. We have considered data for a period of 54 years (1950-2003). During the years of excess NWIWP, the SST was above normal over the equatorial Indian Ocean, SAT was below normal over east Mediterranean Sea and over the Himalayan region and upper tropospheric westerlies strengthen and shift southwards. Upper tropospheric westerlies over north and central India was found to be related with the SST anomalies over the equatorial Indian Ocean. The decrease of SAT over north India and surroundings may largely be a manifestation of cooling brought about by excessive precipitation and sweep of cold air advection in rear of the storms. The intensifying of upper troposphere westerlies embedded with a jet increases the upper level divergence over north India due to increased horizontal shear resulting in intense anticyclone at upper troposphere.
机译：结合印度及周边地区的海表温度（SST），地表气温（SAT）和对流层上风（200 hPa）的变化，研究了西北印度冬季降水（NWIWP）的年际变化。 。我们考虑了54年（1950-2003年）的数据。在NWIWP过剩的年份中，赤道印度洋的SST高于正常值，地中海东部和喜马拉雅地区的SAT值低于正常值，对流层上层的西风加强并向南移动。发现印度北部和中部的对流层上层西风与赤道印度洋上的海温异常有关。印度北部及其周围地区SAT的下降可能主要是由于降水过多和风暴后部的冷空气平流扫掠而导致降温的表现。随着水平剪切的增加，对流层上层对流层西风的强化加剧了印度北部的高层分流，导致对流层上空强烈的反气旋。

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