The role of the North Atlantic Oscillation in shaping regional-scale peak seasonal precipitation across the Indian subcontinent

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Abstract

The present study focuses on the impact of the North Atlantic Oscillation (NAO) in shaping the regional-level precipitation during the peak months of the two main rainy seasons over the Indian subcontinent. Monthly precipitation data from 1871 to 2005 were collected for 30 homogenous regions across the subcontinent. Regression analysis was used to analyze the strength of the relationship between NAO on regional-level precipitation patterns. The results of the study showed distinct spatial variations in the response of regionallevel rainfall to the monthly NAO index. There were greater variations in the strength of the regression coefficients for peak monsoon rainfall (PMR) compared to the peak winter rainfall (PWR) season. During the latter half of the year, the association between PMR and the NAO index was predominantly negative. In general, the role of NAO was more pronounced across most of the regions in the peninsular India.

Original languageEnglish (US)
Pages (from-to)1-13
Number of pages13
JournalEarth Interactions
Volume15
Issue number2
DOIs
StatePublished - Jan 1 2011

Keywords

  • India
  • Monsoon
  • NAO

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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