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Upper tropospheric circulation and thermal anomalies over central Asia associated with major droughts and floods in India

Rajeevan, M (1993) Upper tropospheric circulation and thermal anomalies over central Asia associated with major droughts and floods in India. Current Science, 64 (4). pp. 244-247.

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Abstract

The composite upper tropospheric (200 hPa) circulation and thermal anomalies during April to June were examined in respect of seven drought years (1965, 1966, 1968, 1972, 1974, 1979 and 1982), three flood years (1961, 1970 and 1975) and twelve normal years (1962, 1963, 1964, 1967, 1969, 1971, 1973, 1976, 1977, 1978, 1980 and 1981) using the upper air data of 21 stations of 22 years (1961-1982), There were significant differences between the anomalies during drought and flood years. The anomaly patterns during the normal years were similar to those of flood years but the anomalies were weaker. It has found that a cyclonic (anticyclonic) anomalous circulation with cold (warm) temperature developed over central Asia near Caspian sea during April of drought (flood) years. These anomalies persisted and strengthened during the later months. The cold cyclonic anomalous circulation adversely affects monsoon performance due to excess Eurasian snow cover and the large-scale intrusion of dry westerlies into Indian region.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences
Subjects: Meteorology and Climatology
Depositing User: Administrator ePrints@MoES
Date Deposited: 09 Jun 2016 06:23
Last Modified: 09 Jun 2016 06:23
URI: http://moeseprints.incois.gov.in/id/eprint/4065

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