| Temporal-spatial distribution characteristics of precipitation event frequency and intensity in east of Hexi corridor |
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| DOI：10.7606/j.issn.1000-7601.2009.04.49 |
| Key Words: east of Hexi corridor precipitation event temporal and spatial variation |
| Author Name | Affiliation | | LI Lingping | Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory
of Arid Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou, Gansu 730020, China；
Wuwei Meteorological Bureau, Wuwei, Gansu 733000, China | | LI Yanying | Wuwei Meteorological Bureau, Wuwei, Gansu 733000, China | | GAI Xiaoping | School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Daily rainfall data of 5 weather stations in east of Hexi corridor from 1971～2007 are used to analyze the temporal and spatial va
riation of precipitation events. The results show that the precipitation is relatively in an increase trend in east of Hexi corridor; The number of days of averaged rain, light rain, moderate rain and heavy rain in the area increases, and the annual raining days show a significant increasing trend, which is mostly due to the increasing of the days of light rain; The intensity of annual precipitati
on shows a significant increasing trend due to the increasing of light rain, and the intensity of moderate rain shows a significant decreasing trend; The number of days of averaged rain, light rain, moderate rain and heavy rain in east of Hexi corridor decreases from south to north, and the number of days of averaged rain has a significant increasing trend in Minqin, Gulang, Yongchang and Wushaoling but has a significant decreasing trend in Liangzhou; The intensified centre of annual precipitation is in the southern mountain area of Gulang, while the weakest is in the central part of Liangzhou, and the intensity of annual precipitation shows a significant increasing in Minqin, Liangzhou, Yongchang and Wushaolin
g, but has a slight decreasing trend in Gulang; The events of light rain are more frequent in 1980s, and the events of moderate rain and heavy rain are more frequent during the period from the 1990s to the period of 2001～2007; The intensity of light rain and heavy rain is the strongest, and moderate rain intensity is the weakest in the period of 2001～2007. |
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