Attribution of trends in meteorological drought during 1960–2016 over the Loess Plateau,China |
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作者姓名: | GUO Mengyao SHE Dunxian ZHANG Liping LI Lingcheng YANG Zong-Liang HONG Si |
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作者单位: | State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Hubei Key Laboratory of Water System Science for Sponge City Construction,Wuhan University,Wuhan 430072,China;Jackson School of Geosciences,University of Texas at Austin,Austin,TX 78712-1692,USA |
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基金项目: | National Natural Science Foundation of China(41877159);The National Key Research and Development Program of China(2017YFA0603704);The Scholarship from China Scholarship Council(CSC), No(201906270109) |
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摘 要: | This study uses two forms of the Palmer Drought Severity Index(PDSI), namely the PDSI_TH(potential evapotranspiration estimated-by the Thornthwaite equation) and the PDSI_PM(potential evapotranspiration estimated by the FAO Penman-Monteith equation), to characterize the meteorological drought trends during 1960–2016 in the Loess Plateau(LP) and its four subregions. By designing a series of numerical experiments, we mainly investigated various climatic factors' contributions to the drought trends at annual, summer, and autumn time scales. Overall, the drying trend in the PDSI_TH is much larger than that in the PDSI_PM. The former is more sensitive to air temperature than precipitation, while the latter is the most sensitive to precipitation among all meteorological factors. Increasing temperature results in a decreasing trend(drying) in the PDSI_TH, which is further aggravated by decreasing precipitation, jointly leading to a relatively severe drying trend. For the PDSI_PM that considers more comprehensive climatic factors, the drying trend is partly counteracted by the declining wind speed and solar radiation. Therefore, the PDSI_PM ultimately shows a much smaller drying trend in the past decades.
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收稿时间: | 2020-09-22 |
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