New method to gauge onset and end of Indian monsoon | Current Affairs, Current Affairs 2017

New method to gauge onset and end of Indian monsoon

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A team led by an Indian-origin scientist at the Florida State University (FSU) has created a new methodology “for objectively defining the onset and demise of the Indian summer monsoon” at any location in the country.
Their study — describing the methodology developed and tested by Associate Professor VasubandhuMisra and co-workers at FSU — is published in the journal Climate Dynamics.
“We provide an objective definition of onset and demise of the Indian summer monsoon,” Misrasaid, adding, the chance for detection of false onset and demise is minimised.”
Current weather forecasting and monitoring protocols focus attention on the monsoon’s onset in Kerala in the southwest corner of the country and extrapolating its progress for the rest of India.
Regional meteorological departments have relied on their own ad hoc criteria for determining the monsoon’s onset, often leading to contradicting claims.
But in their report, Misra and co-workers argue that predicting the onset of monsoon for the entire country based on the date of arrival of monsoon rains in Kerala is “inadequate”.
“Onset in the southwest corner of India is only somewhat tied to onset across the rest of India. In fact, it can take anywhere from days to weeks for the monsoon to reach other parts of India,” the report says.
The FSU researchers claim their method for predicting the onset and demise of the Indian monsoon for different locations “is based solely on analysis of rain gauge measurements at these locations available from the India Meteorological Department”.
They say the proposed definition is thus “unique in that it uses only the daily local rainfall information, thus simplifying the process of the diagnosis of the evolution of the monsoon” and effectively removing the necessity for extrapolation.
“We’ve tested this for 105 years of available data rain gauge observations, and this criterion hasn’t failed once for any location over India,” the authors claim.

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