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Precipitation Recycling in the Indian Subcontinent during Summer Monsoon

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Title Precipitation Recycling in the Indian Subcontinent during Summer Monsoon
 
Creator PATHAK, A
GHOSH, S
KUMAR, P
 
Subject GLOBAL WATER CYCLE
PART II
ECOCLIMATOLOGICAL STABILITY
LAGRANGIAN ANALYSIS
ATMOSPHERIC BRANCH
AMAZON BASIN
LAND-SURFACE
VARIABILITY
CLIMATE
MODELS
 
Description The Indian summer monsoon rainfall is dominated by oceanic sources of moisture. However, land surface processes also have a significant role in the generation of precipitation within the Indian subcontinent. Evapotranspiration over a region supplies moisture to the atmosphere, which may lead to precipitation in the same region. This is known as recycled precipitation. The role of evapotranspiration as an additional source of moisture to precipitation has been investigated in earlier studies at continental scales; however, the amount of monsoon precipitation generated from evapotranspiration has not been quantified at the daily scale for the Indian subcontinent. To examine the role of land surface hydrology in regional precipitation and to quantify recycled precipitation, the dynamic recycling model at a daily scale with NCEP Climate Forecast System Reanalysis (CFSR) data for the period of 1980-2010 is used. A high precipitation recycling ratio, that is, the ratio of recycled precipitation to total precipitation, is found at the end of the monsoon (September). As the monsoon progresses in India, enhanced soil moisture and vegetation cover lead to increased evapotranspiration and recycled precipitation. The recycling ratio is highest (around 25%) in northeastern India, which has high vegetation cover leading to high evapotranspiration. Recycled precipitation over central and northeastern India in September is responsible for delaying the withdrawal of the summer monsoon over these regions. A trend analysis of recycled precipitation shows a statistically significant decreasing trend in northeastern India.
 
Publisher AMER METEOROLOGICAL SOC
 
Date 2014-12-28T12:54:07Z
2014-12-28T12:54:07Z
2014
 
Type Article
 
Identifier JOURNAL OF HYDROMETEOROLOGY, 15(5)2050-2066
1525-755X
1525-7541
http://dx.doi.org/10.1175/JHM-D-13-0172.1
http://dspace.library.iitb.ac.in/jspui/handle/100/16619
 
Language English