基于SPI指数甘肃省河东地区干旱特征分析

doi:10.3969/j.issn.1673-503X.2016.05.017

Abstract

Abstract: Using monthly precipitation data of 32 meteorological stations in the Eastern area of the Yellow River in Gansu province from 1971 to 2014,drought characteristics were analyzed based on a standardized precipitation index (SPI).The results show that,for annual drought from 1971 to 2014,there is a drought tendency belt extending from the north to the south of study area.The extent of drought shows a slight downward trend.Most parts of the Eastern area of the Yellow River show a drying trend in spring and summer.The extent of drought shows an upward trend in spring and a downward trend in summer.Most parts of the Eastern area of the Yellow River show a wetting trend in autumn and winter with the extent of drought decreasing.From 1971 to 2014,occurrence frequency of drought is 30% for the Eastern area of the Yellow River.The areas with high drought occurrence frequency are in north-central of Dingxi,Lanzhou,as well as the north of Longnan city.Drought occurrence frequency in winter shows a downward trend.Compared to winter,drought occurrence frequency in a single year or spring,summer and autumn experiences a decline first,but rises latter.The SPIs of annual,spring,autumn,and winter are lower during the periods of 1991 to 2010,1991 to 2000,1991 to 2000,and 1971 to 1980,respectively.Summer SPI is lower during two periods of 1971 to 1980 and 2000 to 2010.

Key words: Drought, Standardized Precipitation Index (SPI), Multiple time scales

CLC Number:

P429

SHA Li, LI Shi, SHA Sha, GUAN Yu-shan. Analysis of drought characteristics based on SPI for Eastern area of the Yellow River in Gansu province[J]. Journal of Meteorology and Environment, 2016, 32(5): 122-130.

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Analysis of drought characteristics based on SPI for Eastern area of the Yellow River in Gansu province

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