Spatial structures and directionalities in Monsoonal precipitation over South Asia

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Date
2010
Volume
17
Issue
5
Journal Title
Title
Series Titel
Publisher
Göttingen : Copernicus GmbH
Abstract

Precipitation during the monsoon season over the Indian subcontinent occurs in form of enormously complex spatiotemporal patterns due to the underlying dynamics of atmospheric circulation and varying topography. Employing methods from nonlinear time series analysis, we study spatial structures of the rainfall field during the summer monsoon and identify principle regions where the dynamics of monsoonal rainfall is more coherent or homogenous. Moreover, we estimate the time delay patterns of rain events. Here we present an analysis of two separate high resolution gridded data sets of daily rainfall covering the Indian subcontinent. Using the method of event synchronization (ES), we estimate regions where heavy rain events during monsoon happen in some lag synchronised form. Further using the delay behaviour of rainfall events, we estimate the directionalities related to the progress of such type of rainfall events. The Active (break) phase of a monsoon is characterised by an increase(decrease) of rainfall over certain regions of the Indian subcontinent. We show that our method is able to identify regions of such coherent rainfall activity.

Description
Keywords
atmospheric circulation, atmospheric dynamics, monsoon, precipitation (climatology), rainfall, regional climate, spatiotemporal analysis, time series analysis, topographic effect, India
Citation
Malik, N., Marwan, N., & Kurths, J. (2010). Spatial structures and directionalities in Monsoonal precipitation over South Asia. 17(5). https://doi.org//10.5194/npg-17-371-2010
License
CC BY 3.0 Unported