Abstract
Temporal and spatial distribution patterns of extreme rainfall in 25 districts of Assam in humid Northeast India were analyzed using gridded (0.25o × 0.25o) daily rainfall from 1901 to 2013. Five out of 11 extreme precipitation indices as recommended by ETCCDI were used for the analysis. Results indicated that the consecutive dry days (CDD), consecutive wet days (CWD), annual total wet days precipitation (PRCPTOT), maximum 1-day precipitation (RX1day) and extreme heavy precipitation (R20) were observed to be highest in Dhubri, Hailakandi, Tinsukia, Udalguri and Cachar districts, respectively. The significance of upward (downward) trend at 90% confidence level of all the extreme precipitation indices used was established using Mann-Kendall trend test. Decreasing (increasing) trend in CWD, PRCPTOT and R20 (CDD and RX1day) was revealed during the study period. Spatial maps of the trends in extreme precipitation indices were generated using Kriging spatial analyst tool under ArcGIS® 10 environment.
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