Drought characteristics variations and its relationship with atmospheric circulation in Guizhou Province
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Abstract:
Standardized Precipitation Evapotranspiration Index ( SPEI ) was used to quantitatively characterize the drought conditions based on monthly precipitation and mean temperature data obtained from 17 meteorological stations from 196022018 in Guizhou Province. The M2K tr end test and R/ S analysis were used to analyze the drought trend in Guizhou Province in the past 59 years. The continuous wavelet transform and cross wavelet transform were used to analyze the characteristics of oscillation period of SPEI and four circulation factors ( M EI, N AO , AO , PDO ) , their common char acteristics and correlation in time and frequency domain. The results showed that the monthly, spring, autumn and annual SPEI series showed a significant downward trend and the decline - 0. 108/ ( 10a) fo r autumn SPEI compared to other series, which indicated that spring and autumn drought gradually intensify in Guizhou Province. The spring and autumn drought may upward in future and the intensity may become more severe, while the intensity of summer and winter drought expressed a weakened possibility . The SPEI had 16-48 months inter-annual oscillation period, and there was a common patterns of 24-110 month at inter-annual and 128-250 month at inter-decadal oscillation circles between SPEI and M EI, N A O, AO , P DO, while a lag positive correlation existed between SPEI and N AO , A O . O verall, M EI mainly affect ed the int er-annual cycle variation o f drought, while PDO and AO mainly affected the longer inter-decadal cycle variation of drought.
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