By using the grey correlation model, to measure the synchronousness of vegetation covers and sandstorm days, as a result, the index of intra-annual and interannual synchronousness is 0.615 and 0.540.

• 采用灰色关联度模型度量植被覆盖与沙尘暴日数的时间同步性，计算出植被指数与沙尘暴日数的年内时间同步性指数为0.；615，年际时间同步性指数为0