基于实际蒸散量修订标准化降水蒸散干旱指数研究
Modification of the standardized precipitation evapotranspiration index based on actual evapotranspiration
李伟光 1侯美亭 2周海霞 3张京红 1邹海平 1陈小敏1
作者信息
- 1. 海南省气候中心,海南海口 570203;海南省南海气象防灾减灾重点实验室,海南海口 570203
- 2. 中国气象局气象干部培训学院,北京 100081
- 3. 海南省三沙市气象局,海南三沙 573199
- 折叠
摘要
为改进SPEI在农业干旱监测中的效果,从水分平衡的角度提出了一种修订的标准化降水蒸散指数(MSPEI).该指数通过计算降水与实际蒸散量的差值,并基于最长连续干旱时间对差值进行自适应修正,采用目视检查概率拟合曲线与Kolmogorov-Smirnov检验2种方法选择适宜分布函数,最后进行标准化转换生成干旱指数.干旱指数有效性检验表明:MSPEI能够准确反映不同季节间干湿状态的差异,在湿润比例低于20％的春季,MSPEI均低于-0.5;在反映干旱趋势时,MSPEI与SPEI具有高度一致性;MSPEI与植被指数具有稳定且较高的相关性,在0.57～0.78之间;在典型干旱过程监测中,MSPEI对旱灾发生、发展和解除过程的描述更符合实际.MSPEI适应于不同气候背景,无需选择时间尺度,即可较准确地反映农业干旱演化过程.
Abstract
In the report,to enhance the effectiveness of the SPEI in agricultural drought monitoring,a modified Standardized Precipitation Evapotranspiration Index(MSPEI)focused on water balance was proposed.The in-dex was calculated by the difference between precipitation and actual evapotranspiration,and which were adap-tive corrected based on the duration of the longest consecutive drought period.The visual inspection for probabi-listic fitting curves and the Kolmogorov-Smirnov test were used to choose an appropriate distribution function.The drought index was obtained by a standardized transformation.The validity test for the aridity index demon-strated that the MSPEI accurately captures the distinctions under wet and dry conditions across seasons.During spring,when the wetness proportion was below 20％,the MSPEI registered below-0.5.For depicting drought trends,there are strong consistency between the MSPEI exhibited and the SPEI.The correlation between MSPEI and the vegetation index remain stable and high,ranging from 0.57 to 0.78.During the monitoring processes of typical drought,the MSPEI's depiction of the start,development,and the end of drought aligns was more realis-tic than that of SPEI.MSPEI adapts to various climatic backgrounds and can accurately depict the evolution of agricultural drought processes without requiring a specific time scale.
关键词
干旱指数/SPEI/实际蒸散量/MSPEI/水分平衡Key words
drought index/SPEI/actual evapotranspiration/MSPEI/water balance引用本文复制引用
基金项目
国家自然科学基金(U21A6001)
国家重点研发计划(2022YFD2301201)
海南省自然科学基金(421MS101)
海南省院士创新平台科研项目()
出版年
2024
国家科技期刊平台
NSTL
万方数据