[PDF][PDF] Trends in intense rainfall events over Gujarat State (India) in the warming environment using gridded and conventional data

H Dave, ME James, K Ray - International Journal of Applied …, 2017 - researchgate.net
H Dave, ME James, K Ray
International Journal of Applied Environmental Sciences, 2017researchgate.net
Trends in temperature and rainfall over Gujarat State have been analyzed using station data
and gridded data. Statistically significant (99.9% level) increasing trend in annual
temperature is observed at Veraval, a coastal station in Saurashtra region, during the period
1901-2014. The temperature pattern have shown a significant increasing trend during 1901-
1930, followed by a plateau region during 1931-1990 and a sudden upward shift in early
nineties. A significant increasing trend in temperature (0.220C/decade) is observed over arid …
Abstract
Trends in temperature and rainfall over Gujarat State have been analyzed using station data and gridded data. Statistically significant (99.9% level) increasing trend in annual temperature is observed at Veraval, a coastal station in Saurashtra region, during the period 1901-2014. The temperature pattern have shown a significant increasing trend during 1901-1930, followed by a plateau region during 1931-1990 and a sudden upward shift in early nineties. A significant increasing trend in temperature (0.220C/decade) is observed over arid regions of the State; indicating warmer regions of the State are getting more and more warmer. Reversal of east-west temperature gradient is observed from the decade 1991-2000 onwards, which may be due to dominance of offshore trough and MTC. Monsoon rainfall at Veraval showed a significant (99.9% level) increasing trend with a change of 44.3 mm/decade and has not shown any decadal or epochal changes. The arid region of the State where significant increase in temperature is observed does not show any significant change in monsoon rainfall. Eleven stations out of sixteen have shown increasing trends (> 5%/decade) in monsoon rainfall, in which, at six stations the increasing trend is statistically significant. The highest one-day point rainfall over the State is also found to be increased with time. Semi-arid regions of the State show significant increasing trend in intensity and frequency of intense rainfall events during last four decades. At regional
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