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The 20th century transitions in basic and extreme monsoon rainfall indices in India: Comparison of the ETCCDI indices

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Title The 20th century transitions in basic and extreme monsoon rainfall indices in India: Comparison of the ETCCDI indices
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Creator Dileep K. Panda
P. Panigrahi
S. Mohanty
R.K. Mohanty
R.R. Sethi
 
Subject Extreme rainfall indices
Spatiotemporal pattern
Indian monsoon season
PDSI
TIO SST
 
Description Not Available
The mean and extreme matrices of the monsoon rainfall in India not only play an important role in depicting the
global monsoon climate, but also their spatiotemporal patterns influence the socio-economic profile of a major
proportion of the country's huge population. Given the reported conflicting trends at the global and national
scales, the present study investigates the 20th century (1901–2004) changes in monsoon rainfall of India, particularly focusing the indices developed by the Expert Team on Climate Change Detection and Indices (ETCCDI) to facilitate a global comparison. Result of this comprehensive analysis, which includes the response of fifteen indices over two study periods (i.e., 1901–1940 and 1961–2004), indicates clear signals of change with respect to the period and region of study and the choice of the ETCCDI indices. While wet day frequency, low-tomoderate events and consecutive wet days (CWD) exhibit a prominent transition from a pre-1940 wetting to a post-1960 drying tendency over a large part of the central-north India (CNI), both the wet and dry extremes
have occurred in a spatially less consistent manner during the recent decades. For consecutive dry days (CDD), the reported less clear global signals could be related to the timescale of analysis, as our sub-seasonal scale results Display consistent changes compared to that of the seasonal and annual scales. The Palmer Drought Severity Index (PDSI) provides clear indications of a post-1960 non-stationarity, showing changes in the mean as well as variance. Based on the partial Mann–Kendall test (PMK), some of the identified rainfall trends during 1961–2004 are found to be influenced more by the tropical Indian Ocean sea surface temperatures than the El Niño–Southern Oscillation index. These results have important implications for formulating the water resource management strategy, particularly over the drying central and northern parts of the country.
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Date 2018-07-23T09:44:17Z
2018-07-23T09:44:17Z
2016-07-06
 
Type Research Paper
 
Identifier 8
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http://krishi.icar.gov.in/jspui/handle/123456789/6282
 
Language English
 
Relation Not Available;
 
Publisher ELSEVIER