Analysis on drought characteristics of Xi’an City based on Z index of available rainfall
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Abstract:
According to the meteorological date in Xi’an city from 1951 to 2013, the Z index of available rainfall was calculated to propose the characterization of drought strength, which was divided into 7 levels. From the results of analyzing the drought characteristics in city, we find that: (1) Drying appears in spring summer and winter, and every season shows a drying trend according to seasonal difference of drought. (2) The annual Z index shows an increasing trend in 63 years. The frequency and strength of drought have increased remarkably since 1990s. (3) Mann-Kendall test shows that the sudden change years were 1957 and 1958, and drying trend has been existing since the year of 1965 and became more significant since 1997.By comparing with the Palmer index and traditional Z index’ assessments of the typical years’ drought period, the objectivity of the analysis’ results are certified.
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