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standardized precipitation evapotranspiration index(30)
drought(16)
standardized precipitation index(10)
climate change(9)
standardized precipitation evapotranspiration index (spei)(9)
hydrological drought(4)
meteorological drought(4)
spei(4)
drought characteristics(3)
drought variability(3)
modified mann-kendall trend(3)
nigeria(3)
northeast china(3)
seasonal droughts(3)
southwest china(3)
standardized precipitation and evapotranspiration index(3)
atmospheric circulation(2)
china(2)
climate variability(2)
drought prediction(2)
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