Publication Date:
2012-01-19
Description:
In this paper, by using the daily precipitation data measured at 58 meteorological stations, spatial and temporal variability of daily precipitation including zero rainfall values (called “precipitation”) and without zero rainfall values (called “rain”), as well as four precipitation extrema (P 0 , P 20 , P 50 , and P 100 representing the daily precipitation with the magnitude smaller than 0.1 mm, bigger than 20 mm, 50 mm, and 100 mm per day, respectively), in the Yangtze River Delta (YRD) during 1958–2007 were analyzed, and the urbanization impacts were further investigated. Results indicate that: (1) differing from the downward trends in 1958–1985, daily precipitation and rain in 1986–2007 show slowly downward trends in the mid YRD, but show upward trends in the northern and southern YRD; (2) spatial and temporal variability of the rain is more complex than daily precipitation. Both of them become smaller, but show more obvious fluctuations in 1986–2007; (3) urbanizations cause not only the urban rainfall island problem but also more obvious fluctuations of rain intensity in the mid YRD, reflecting more uncertainty of daily precipitation variability; (4) urbanizations have little impacts on the variability of P 0 and P 100 but cause notable increases of P 20 and P 50 ; and (5) the spatial variability of daily precipitation and precipitation extrema in 1958–1985 clearly shows a breakpoint at 30°20′N latitude, but the breakpoint disappears afterwards due to the urbanization impacts. Copyright © 2012 John Wiley & Sons, Ltd.
Print ISSN:
0885-6087
Electronic ISSN:
1099-1085
Topics:
Architecture, Civil Engineering, Surveying
,
Geography
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