Relationships among dust outbreaks, vegetation cover, and surface soil water content on the Loess Plateau of China, 1999–2000 |
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| Authors: | Reiji Kimura Long Bai Jiemin Wang |
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| Institution: | aArid Land Research Center, Tottori University, Hamasaka 1390, Tottori 680-0001, Japan;bShenyang Agricultural University, Shenyang, Liaoning 110161, China;cCold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China |
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| Abstract: | We analyzed relationships among dust outbreaks, Normalized Difference Vegetation Indices (NDVI), and surface soil water content (0 to 2 cm depth) on the Loess Plateau, a significant dust source area of East Asia. World Surface Data for wind speed and current weather, coarse-resolution data for NDVI, and a three-layer soil model for surface soil water content were used. The threshold NDVI for preventing dust outbreaks was about 0.2 when the wind speed ranged from 7 to 8 m s− 1. This threshold NDVI corresponds to a vegetation cover of 18%. The threshold ratio of surface soil water content to the field capacity (θr) was about 0.2. Conditions facilitating dust outbreaks on the Loess Plateau are when NDVI is less than 0.2 with wind speed  7 m s− 1 and θr < 0.2, and when NDVI is greater than 0.2 with wind speed 9 m s− 1 and θr < 0.2. |
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| Keywords: | Asian dust Dust outbreak frequency Meteorological data Three-layer soil model Vegetation cover |
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