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[1]JING Juanli,HE Caixia,WANG Yongfeng,et al.Spatiotemporal Evolution Characteristics of Meteorological Drought in Southwest China from 1902 to 2018[J].Research of Soil and Water Conservation,2022,29(03):220-227.

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Spatiotemporal Evolution Characteristics of Meteorological Drought in Southwest China from 1902 to 2018

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 03 Page number: 220-227 Column: Public date: 2022-04-20

Title:: Spatiotemporal Evolution Characteristics of Meteorological Drought in Southwest China from 1902 to 2018

Author(s):: JING Juanli^1,2, HE Caixia¹, WANG Yongfeng^1,2, MA Bingxin¹, LIU Bing¹; (1.College of Geomatics and Geoinformation, Guilin University of Technology, Guilin, Guangxi 541006, China; 2.Guangxi Key Laboratory of Spatial Information and Geomatics, Guilin, Guangxi 541006, China)

Keywords:: southwest China; standardized precipitation evapotranspiration index; drought frequency; Sen trend analysis; Mann-Kendall test; empirical orthogonal function

CLC:: P426.616

DOI:: -

Abstract:: In view of the severity of drought in southwest China, it has become an urgent requirement to quantitatively characterize the spatio-temporal evolution of drought and reveal the law of drought development. Based on standardized precipitation evapotranspiration index(SPEI)data from 1902 to 2018, we counted the frequency and intensity of droughts of different grades in the southwestern region. Sen trend analysis, Mann-Kendall test and empirical orthogonal function analysis methods were used to study the temporal and spatial evolution characteristics of drought in southwest China in order to provide a scientific basis for drought changes and ecological maintenance in southwest China. The results show that:(1)the annual SPEI in southwest China from 1902 to 2018 showed a downward trend at a rate of 0.025/decade, among wich there was a frequent drought-humidity alternation from 1954 to 1974, with multiple insignificant mutations;(2)the drought intensity in the southwestern region showed an increasing trend, among which the intensity of moderate drought and severe drought increased significantly;(3)the frequency of drought in southwestern region was different in spatial distribution, among which the frequency of light drought was the highest and the extreme drought was the lowest; the change trend was mainly insignificant decline, accounting for 68.22%, indicating an aridity trend in the southwest region over the past century;(5)in the analysis of drought spatiotemporal modalities, the three modes reflected the same, south-north and east-west distribution characteristics of drought in the study area, respectively. In summary, spatiotemporal evolution characteristics of meteorological drought in the southwest are revealed.

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Last Update: 2022-04-20