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Why is ENSO influencing northwest India winter precipitation in recent decades?

Yadav, RK and Yoo, JH and Kucharski, F and Abid, MA (2010) Why is ENSO influencing northwest India winter precipitation in recent decades? Journal of Climate, 23 (8). pp. 1979-1993.

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Abstract

This study examines decadal changes of the El Niño-Southern Oscillation (ENSO) influence on the interannual variability of northwest India winter precipitation (NWIWP). The analysis is based on correlations and regressions performed using India Meteorological Department (IMD) records based on station data and reanalysis fields from 1950 to 2008. The authors find that the interannual variability of NWIWP is influenced by the ENSO phenomenon in the recent decades. This conclusion is supported by a consistency across the different observational datasets employed in this study and confirmed by numerical modeling. A physical mechanism for such an influence is proposed, by which western disturbances (WDs) are intensified over northwest India because of a baroclinic response due to Sverdrup balance related to large-scale sinking motion over the western Pacific during the warm phase of ENSO. This response causes an upper-level cyclonic circulation anomaly north of India and a low-level anticyclonic anomaly over southern and central India. The cyclonic circulation anomaly intensifies the WDs passing over northwest India.

Item Type: Article
Additional Information: Copyright of this article belongs to American Meteorological Society
Uncontrolled Keywords: Anticyclonic anomalies; Baroclinic; Central India; Cyclonic circulation; Data sets; Decadal change; Interannual variability; Numerical modeling; Physical mechanism; Reanalysis; Southern Oscillation; Station data; Western Pacific; Winter precipitation, Nickel compounds, Atmospheric pressure, annual variation; anticyclone; atmospheric circulation; baroclinic mode; climate change; correlation; data set; decadal variation; El Nino-Southern Oscillation; precipitation (climatology); regression analysis; winter, Pacific Ocean; Pacific Ocean (West)
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 29 May 2015 09:26
Last Modified: 29 May 2015 09:26
URI: http://moeseprints.incois.gov.in/id/eprint/801

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