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Summer Research Fellowship Programme of India's Science Academies

A process network based approach in understanding the Indian summer monsoon

Swetha S

Savitri Bhai Phule Pune University, Pune, 411007

Dr. Subimal Gosh

Indian Institute of Technology, Bombay, 400076

Abstract

India being wholly recognised as a Monsoon country , its economy and rain depends on the strength and vigor of Monsoon. Major part of states in India , depends on Summer Monsoon that occurs during the months of June-September (JJAS). In spite of being a regular phenomenon observed over decades , understanding this complex system is still an open area of research . In this study a different approach called Process network is used to understand this complex system. A process network is a network that helps in delineating complex feedbacks along with its associated time scales observed in the study under study. To understand how these process network represents different states of the system, the study is carried over two years, one drought year and one normal year. 2015 is a drought year with a strong El-Nino observed in the Tropical Pacific and 2011 is a normal year. Therefore, a process Network was developed over Indian region during these two years . Based on the research carried out by (Ruddell et al., 2009) process network developed during a drought and normal year over an eco-hydrological complex system, proved that the network will show a significant change in the observed links. In a similar way, the objective of this study is to develop a process network during a drought and normal monsoon year and try to understand the change in different feedback loops.

Keywords: complex network, rainfall, monsoon, extremes, drought

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