Clarification on the relationships between soil and land surface conditions and threshold wind speeds for aeolian dust generation aimed at the evaluation of wide-area wind erosion

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We investigated the cause of frequent dust events in East Asia since 2000. We developed a methodology to statistically estimate a threshold wind speed for dust generation using meteorological observatory data, and we employed this threshold speed as an index of soil and land surface conditions. We clarified that a major cause of increased dust events is a desertification (i.e., a decrease of threshold speed) in Mongolia, eastern Inner Mongolian and the northeastern China from an analysis of dust generation frequeny, strong wind frequency, and threshold speed.