PDSI和Z指数在西北干旱监测应用中差异性分析  

Analysis of different dryness/wetness index in Northwest China

作　　者：唐红玉[1,2] 王志伟[3] 史津梅[4] 杨兴国[1] 

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃兰州730001 [2]重庆市气候中心,重庆401147 [3]山西省卫星遥感减灾服务中心,山西太原030002 [4]青海省气象台,青海西宁810001

出　　处：《干旱地区农业研究》2009年第5期6-11,64,共7页Agricultural Research in the Arid Areas

基　　金：兰州干旱气象科学研究基金项目(IAM200507)

摘　　要：利用西北地区137个气象台站1961～2003年气象资料，分别计算了西北地区的Z和PDSI两种干旱指数，并对其结果进行了对比分析。结果认为：两种指数在多数地区多数季节可以互相兼容，但Z指数适宜于在雨季表征干湿事件，而PDSI则适宜于西北的所有地区和所有季节，并对当地干旱事件的反映更为敏感；在对不同程度干旱面积的表征上，PDSI对轻旱的表征反映较为敏感，而Z指数对重旱的反映更为敏感；对于中等程度的干旱而言，两种指数表征下的干旱面积较为统一；从西北地区的实际情况出发，PDSI对干旱的表征更为客观。Based on analysis of the meteorological data at 137 meteorological stations in Northwest China from 1961 to 2003, the corrected Palmer drought severity index （PDSI） and Z index were calculated and analyzed. The resuhs showed that the Z index was more condign than PDSI in monsoon, while the PDSI is more objective and hypersensitive in comparison with Z index in dryness monitoring in the Northwest. The PDSI is more hypersensitive in light dryness monitoring in the Northwest, but the Z index is more hypersensitive in grievous dryness. The PDSI and the Z index were uniform in medium dryness.

关 键 词：PDSI指数 Z指数 西北干旱监测 差异分析 

分 类 号：S423[农业科学—植物保护]