An evaluation of the Standardized Precipitation Index, the China‐Z Index and the statistical Z‐Score
An evaluation of the Standardized Precipitation Index, the China‐Z Index and the statistical Z‐Score
复制标题
DOI：
10.1002/joc.658
复制
发表时间：
2001-05
期刊：
影响因子：
--
通讯作者：
Hong-zhi Wu;M. Hayes;A. Weiss;Q. Hu
中科院分区：
文献类型：
--
作者：
Hong-zhi Wu;M. Hayes;A. Weiss;Q. Hu
标准化降水指数(SPI)被用来检测不同时间尺度上的干旱和湿润时段，这是典型干旱指数所不具备的一个重要特征。越来越多的用户使用SPI来监测干旱。虽然SPI的计算比Palmer干旱指数等其他干旱指数容易，但仍然相对复杂。在中国，自1995年以来，中国国家气候中心一直使用一种名为中国-Z指数的指数来监测全国的水分状况。这一指数的计算比SPI更容易。第三个指标，统计Z分数，也可以用来监测干旱。本文利用中国地区1951年1月至1998年12月代表湿润、干旱气候和旱涝的4个地点的逐月降水总量，在1、3、6、9和12个月的时间尺度上计算了SPI、CZI和Z-SCORE。比较了各种指标应用的优缺点。研究结果表明，CZI和Z-Score在所有时间尺度上都能提供与SPI相似的结果，而且CZI和Z-Score的计算相对容易，可能为监测水分状况提供更好的工具。版权所有©2001皇家气象学会
The Standardized Precipitation Index (SPI) was developed to detect drought and wet periods at different time scales, an important characteristic that is not accomplished with typical drought indices. More and more users employ the SPI to monitor droughts. Although calculation of the SPI is easier than other drought indices, such as the Palmer Drought Index, it is still relatively complex. In China, an index called the China‐Z Index (CZI) has been used since 1995 by the National Climate Centre of China to monitor moisture conditions across the country. The calculation of this index is easier than the SPI. A third index, the statistical Z‐Score, can also be used to monitor droughts. This paper evaluates the SPI, CZI and Z‐Score on 1‐, 3‐, 6‐, 9‐ and 12‐month time scales using monthly precipitation totals for four locations in China from January 1951 to December 1998 representing humid and arid climates, and cases of drought and flood. Advantages and disadvantages for the application of each index are compared. Study results indicate that the CZI and Z‐Score can provide results similar to the SPI for all time scales, and that the calculations of the CZI and Z‐Score are relatively easy compared with the SPI, possibly offering better tools to monitor moisture conditions. Copyright © 2001 Royal Meteorological Society