Analysis of spatial and temporal extreme monsoonal rainfall over South Asia using complex networks

  • We present a detailed analysis of summer monsoon rainfall over the Indian peninsular using nonlinear spatial correlations. This analysis is carried out employing the tools of complex networks and a measure of nonlinear correlation for point processes such as rainfall, called event synchronization. This study provides valuable insights into the spatial organization, scales, and structure of the 90th and 94th percentile rainfall events during the Indian summer monsoon (June-September). We furthermore analyse the influence of different critical synoptic atmospheric systems and the impact of the steep Himalayan topography on rainfall patterns. The presented method not only helps us in visualising the structure of the extreme-event rainfall fields, but also identifies the water vapor pathways and decadal-scale moisture sinks over the region. Furthermore a simple scheme based on complex networks is presented to decipher the spatial intricacies and temporal evolution of monsoonal rainfall patterns over the last 6 decades.

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Author:Nishant Malik, Bodo BookhagenORCiDGND, Norbert Marwan, Jürgen KurthsORCiDGND
ISSN:0930-7575 (print)
Parent Title (English):Climate dynamics : observational, theoretical and computational research on the climate system
Place of publication:New York
Document Type:Article
Year of first Publication:2012
Year of Completion:2012
Release Date:2017/03/26
Tag:Complex networks; Event synchronization; Indian summer monsoon; Rainfall patterns
First Page:971
Last Page:987
Funder:DFG Graduate School [1364]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert