Difference of Dry and Wet Conditions during Dry Season in Western and Eastern of Guizhou Province

doi:10.3969/j.issn.1000-6362.2016.03.012

Abstract

Abstract:

Based on the data of daily air temperature, precipitation, a small amount of evaporation capacity from 85 meteorological stations from October 1960 to March 2010 in Guizhou province, by using the methods of linear trend, M-K mutation, Morlet wavelet, accumulated temperature dryness index(ATDI) and arid-wet index(I), the meteorological drought situation in dry seasons (from October to March of next year) of Guizhou province was analyzed. The results showed that the precipitation did not changed obviously in western and eastern region of Guizhou province, though with a little periodical change. In the western region, the precipitation had reduced since 2002, with the linear tendency -59.5mm·10y^-1(P<0.01).In the eastern region, the precipitation had reduced since 2005, with the linear tendency -97.7mm·10y^-1(P<0.01).The regional meteorological drought in western and eastern region of Guizhou Province increased in 1990s, and there was significant differenton the period of sudden change and periodical characteristics (P＜0.05) for precipitation in the two regions.In the western region, the sudden change of amounts occurred in 1979, with the periodical concussion of 5-7 years. In the eastern region, the sudden change occurred in 1995, with the periodical concussion of 2-3 years. In last 50 years, the aridity index and arid-wet index in western region were larger and lower obviously than that of eastern region and the meteorological drought in western region was severe than that of the eastern region.The temperature dryness, the arid-wet index and the linear fitting rate of precipitation anomaly percentage were quite high in the two regions, and all of R² exceeded 0.8,and the western region was higher than that of the eastern region.The temperature dryness and the arid-wet index could reflect the meteorological drought extent dry seasons in eastern and western region of Guihzou province.

Key words: Winter half year, Precipitation, Aridity index, Arid-wet index, Guizhou Province

CHI Zai-xiang, LI Gui-qiong, BAI Hui, LONG Xian-ju,PAN Xu-yan, XIAO Yan-lin. Difference of Dry and Wet Conditions during Dry Season in Western and Eastern of Guizhou Province[J]. Chinese Journal of Agrometeorology, 2016, 37(03): 361-367.

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