期刊
THEORETICAL AND APPLIED CLIMATOLOGY
卷 118, 期 3, 页码 581-595出版社
SPRINGER WIEN
DOI: 10.1007/s00704-013-1087-6
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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]
Based on daily precipitation records at 75 meteorological stations in Hunan Province, central south China, the spatial and temporal variability of precipitation indices is analyzed during 1961-2010. For precipitation extremes, most of precipitation indices suggest that both the amount and the intensity of extreme precipitation are increasing, especially the mean precipitation amount on a wet day, showing a significant positive trend. Meanwhile, both of the monthly rainfall heterogeneity and the contribution of the days with the greatest rainfall show an upward trend. When it comes to rainfall erosivity, most of this province is characterized by high values of annual rainfall erosivity. Although the directions of trends in annual rainfall erosivity at most stations are upward, only 6 of the 75 stations have significant trends. Furthermore, the spatial and temporal variation of dryness/wetness has been assessed by the standardized precipitation index (SPI). The principal component analysis (PCA) was applied to the SPI series computed on 24-month time scales. The results demonstrated a noticeable spatial variability with three subregions characterized by different trends: a remarkable wet tendency prevails in the central and southern areas, while the northern areas are dominated by a remarkable dry tendency.
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