Characteristics of dust event in East Asia : Focus on the Gobi Desert, and Mongolia regions

摘要

[ABSTRACT] This study investigated the effect of snow and vegetation covers on dust emission by the correlation analysis of strong wind frequency and dust emission frequency, where the strong wind is defined with a constant threshold 6.5 m/sec. This correlation should be high (low) where the variance of land surface environment is low (large). In addition to this idea, referring to the parameterizations of threshold wind speed by NDVI and snow cover fraction, we built four hypotheses as shown in section 3.1. However, our obtained results disagreed with these in many points, and this indicates problems in the current parameterizations. We will discuss the reasons of these disagreements and some methods will be proposed to clarify these problems.