ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Analysis of Extreme Precipitation Events Change for Hebei Prov ince
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Abstract:
By using daily precipitation data of Hebei Province, from 1961 to 2005 and the e xtreme precipitation indices developed by WMO/CCL and CLIVAR, the temporal and s p atial characteristics of change of extreme precipitation events in the province were analyzed. Results show that the average maximum oneday precipitation unde rgoes a decreasing trend, especially in the south of Hebei Plain, with 1980 bein g the abrupt year; Days with intensive precipitation as defined by R95% and heav y precipitation as defined by RM日 more or less remain unchanged over the perio d analyzed, in spite of the fact that the stations of northern Hebei Plateau gen erally witness an increase, and those of the south a decrease; An obvious upward trend of days with intensive and heavy precipitation exists in late 1990s.The results indicate that average maxi mum oneday precipitation, days with precipitation and annual precipitation amo unt experience similar trends of decrease, but extreme precipitation events incl uding days with intensive and heavy precipitation see no significant change. The se imply that the proportion of the extreme precipitation events in the total pr ecipitation days, and probably the proportion of extreme precipitation amount in the total annual precipitation, might increase over period 1961-2005 in the pro vince. The increase dominantly occurs after mid 1990s.
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