Surface and Upper Air Fields During Extreme Winter Precipitation Over the Western Himalayas |
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| Authors: | A P Dimri |
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| Institution: | (1) Research and Development Centre, Snow and Avalanche Study Establishment, Him Parisar, Sector 37A, Chandigarh, 160036, India |
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| Abstract: | Surface and upper air circulation features associated with extreme precipitation years are demonstrated during winter season
viz., December, January, February and March (DJFM) to examine winter weather affecting the western Himalayas. These circulations
are studied over the domain 15°S–45°N and 30°E–120°E. This domain is considered particularly to illustrate the distribution
of precipitation due to a wintertime eastward moving synoptic weather system called western disturbances. Surplus and deficient
years of seasonal (DJFM) precipitation are identified using ± 20% departure from mean from uninitialized daily reanalysis
data of forty (1958–1997) years of the National Center For Environmental Prediction (NCEP), US. The years 1965–1969, 1973
and 1991 are found to be surplus years and the years 1962, 1963, 1971, 1977, and 1985 are found to be deficient years. Comparative
study between composites of these two categories is made using students t-test of significance. Significant differences in
sea-level pressure, zonal and meridional component of wind at surface and upper levels, total precipitable water content,
geopotential height and temperature are observed in the two contrasting seasons. |
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| Keywords: | Reanalysis circulation |
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