唐红玉,王志伟,史津梅,杨兴国.PDSI和Z指数在西北干旱监测应用中差异性分析[J].干旱地区农业研究,2009,27(5):6~11
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
  
DOI：10.7606/j.issn.1000-7601.2009.05.02
中文关键词:  PDSI指数  Z指数  西北干旱监测  差异分析
英文关键词:PDSI index  Z index  Northwest China  analysis of drought
基金项目:兰州干旱气象科学研究基金项目(IAM200507)
作者单位
唐红玉 Institute of Arid Meteorology China Meteorological Administration， Lanzhou， Gansu 730001， China ；Qinghai Cli mate Center，Xining， Qinghai 810001， China 
王志伟 Qinghai Meteorological Observatory，Xining， Qinghai 810001， China 
史津梅 Shanxi Satellite Remote-Sensing Center for Reducing Disasters， Taiyuan， Shanxi 030002， China 
杨兴国 Institute of Arid Meteorology China Meteorological Administration， Lanzhou， Gansu 730001， China 
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中文摘要:
      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。
英文摘要:
      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 results 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.
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