改进的CI指数在安徽省应用研究

运用安徽省77个气象台站1961—2009年的逐日气温和降水资料以及安徽省所有测墒站建站至2009年的土壤墒情资料,研究分析改进的CI指数在安徽省的应用情况。结果表明：在统计特征、与土壤墒情的相关性以及干旱的空间分布等方面,改进的CI指数NCC2CI保持了原来的CI指数OldCI的优点;但在干旱过程的逐日演变诊断方面,NCC2CI指数较OldCI指数有了诸多改进。对于安徽省干旱监测业务来说,NCC2CI明显优于OldCI。

Study on the Application of the Improved CI Index in Anhui Province

By using not only the daily precipitation and temperature data at 77 stations of Anhui Province during 1961-2009, but also the soil moisture data in all stations from the start of the record to 2009, this paper analyzes the application of the improved CI index in Anhui Province. The results show that in the aspects of statistic characteristics, its correlation to soil moisture, the spatial distribution of drought and so on, the improved CI (NCC2CI) index inherits the advantages of the OldCI index, but in the aspect of diagnosis of the daily evolution of the drought process, the NCC2CI index has much improvements compared with the OldCI index. As to the drought monitoring in Anhui Province, the NCC2CI index is superior over the OldCI index obviously.