Character and Distribution of Short-duration Precipitationin Southeast Gansu, China
Received date: 2012-05-04
Revised date: 2012-05-31
Online published: 2012-05-31
In this paper, the character of the short-duration precipitation in the southeast Gansu were analyzed using hourly precipitation data in 2009-2010 and daily precipitation data during 1971-2000 in Gansu province. The main precipitation time section concentrates from April to September and precipitation during the period accounts for more than 80%. Precipitation rapidly increases from northwest to southeast in the studied area, but on the other hand, the high and low centers more than other districts on the plateau, probably caused by plateau terrain and monsoon. The short-duration precipitation have their maximum values around late-afternoon, but with the precipitation duration increase, the maximum values gradually move to early morning and the amplitude decreases. The short-duration precipitation accounts for the maximum proportion not only for frequency but also for contribution to total precipitation. The 40.3% of precipitation processes belong to short-duration precipitation even more than 90% for some stations. In a word, the short-duration precipitation is an important precipitation type. The 19.4% of short-duration precipitation is heavy precipitation, also proved that short-duration heavy precipitation is an important part of short-duration precipitation. Analysis of the diurnal variation of short-duration precipitation events shows that the frequency reaches the maximum value toward evening and the second highest value at midnight. In addition, we find that the precipitation-concentration degree is quite large, basically above the 0.6, precipitation-concentration period mostly located in July and August.
ZHANG Zhi-xian1 , 2 , 3 , ZHANG Qiang1 , 2 , 4 , ZHAO Qing-yun5 , ZHANG Li-yang2 . Character and Distribution of Short-duration Precipitationin Southeast Gansu, China[J]. Journal of Desert Research, 2013 , 33(4) : 1184 -1190 . DOI: 10.7522/j.issn.1000-694X.2013.00167
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