期刊
WATER RESOURCES MANAGEMENT
卷 28, 期 6, 页码 1655-1670出版社
SPRINGER
DOI: 10.1007/s11269-014-0572-8
关键词
Sichuan; China; Precipitation; Dryness/wetness
资金
- Forestry Industry Research special funds for Public Welfare Projects Study of water resource control function of typical forest vegetation in the region of Yangtze river delta [201104005-04]
- National Natural Science Foundation of China [51109109]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2012BAC23B01, 2012BAD16B0305]
- National 973 Program [2006CB705809]
Changes in precipitation exerts a huge impact on human beings and it is of vital importance to study the regular pattern of meteorological and hydrological factors. In order to explore the changing patterns of precipitation in Sichuan province in west China during 1961-2008, several precipitation related indices were analysed by the Mann-Kendall test. For monthly precipitation, significant increasing trends are mainly found during January, March and June, while significant decreasing trends mostly are observed during July, September and October. Most of extreme precipitation indices are decreasing. Especially the annual total precipitation in wet days and maximum number of consecutive wet days show significant negative trends. Furthermore, the spatial and temporal variation of dryness/wetness has been assessed by Standardized Precipitation Index (SPI) and principal component analysis (PCA) on 24-month time scales. The results demonstrated noticeable spatial patterns with several sub-regions characterized by different trends: a remarkable dry tendency prevails in central and east Sichuan, while the other areas are dominated by a wet tendency.
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