Characteristics of Drought Change in the Loess Plateau Area of Shaanxi Based on the Standardized Precipitation Index during 1971-2010
Received date: 2012-08-10
Revised date: 2012-08-28
Online published: 2012-08-28
According to the precipitation data from 68 meteorological stations in the Loess Plateau Area of Shaanxi, the drought characteristics during 1971-2010 of the studied area was analyzed at scale of month, season and year based on the standardized precipitation index(SPI), and its spatial pattern was analyzed using the EOF method, and the inter-annual and inter-decadal change of the percentage of drought stations and drought strength were also analyzed at scale of month, season and year. The results showed that the first, second, third feature vector reflected different drought characteristics in the Loess Plateau Area of Shaanxi, and the first feature vector indicated consistency of drought characteristics in different sub-areas, the second feature vector indicated north-south opposite pattern of drought characteristics, the third feature vector indicated opposite pattern of drought characteristics between middle sub-area and northern and southern sub-area. The percentage of drought stations and drought strength showed obviously changing trends of heavy drought-light drought-heavy drought-light drought during 1971-2010 in the Loess Plateau Area of Shaanxi. Since 2001, the drought strength reduced by different rates in summer, autumn, winter, but the drought strength increased in spring. The drought strength in spring and summer showed opposite trend between the north Shaanxi and middle Shaanxi, and drought strength in autumn and winter showed consistent trend between the sub-areas. There were 3.8 dry months per year on average in the Loess Plateau Area of Shaanxi, and there was one dry month at least every year, and there was 6-9 dry months at most.
Key words: drought; standardized precipitation index; the Loess Plateau; Shaanxi
SUN Zhi-hui1 , 2 , WANG Zhi-liang1 , 2 , CAO Xue-mei1 , 2 , YANG Qiong1 , 2 , LIU Zhi-chao1 , 2 , LEI Yan-peng1 , 2 . Characteristics of Drought Change in the Loess Plateau Area of Shaanxi Based on the Standardized Precipitation Index during 1971-2010[J]. Journal of Desert Research, 2013 , 33(5) : 1560 -1567 . DOI: 10.7522/j.issn.1000-694X.2013.00223
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