Spatiotemporal characteristics of drought in Northeast China based on SPEI
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Abstract:
Based on monthly precipitation and average air temperature data from 86 national meteorological stations during the past 55 years (1960-2014) in the Northeast China, the values of Standardized Precipitation Evapotranspiration Index (SPEI) at various time scales were calculated to represent drought conditions, and the characteristics of spatiotemporal distribution of drought at different time scales in the Northeast China were analyzed. The calculation results were compared with the actual drought area data to verify the applicability of the SPEI to the drought assessment of the Northwest China. The results showed that the frequency of severe droughts in spring, summer, and winter would increase with the increase of the time scale, whereas the frequency of medium droughts would decrease with the increase of the time scale. Droughts and floods in the Northeast China occurred alternatively during the recent 55 years. The frequency and intensity of drought increased gradually on a decadal basis. Generally speaking, the scope of extreme droughts would gradually expand with the increase of the time scale. Droughts occurred at different frequencies in spring, summer, and spring in the Northeast China. No extreme drought occurred in winter in Jilin and Liaoning provinces. No severe drought occurred in the middle of Heilongjiang province.
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