降尘量能很好地反映整层沙尘气溶胶的信息。基于WRF/Chem沙尘暴模式及大气边界层的观测资料，获得了包括尘卷风起沙过程的日、月和年总起沙量，进而分析它们与自然降尘量之间的关系。结果表明：（1）半定量的沙尘天气日数与逐月降尘量呈极显著的正相关，但无法更精细地量化降尘量的来源；（2）模式量化计算的沙尘天气起沙量与降尘量的变化大体一致，它对总起沙量的平均贡献率为76%；（3）尘卷风对总起沙量的贡献达到了24%，在无沙尘天气的时段，降尘量100%来自尘卷风的起沙量；（4）沙尘天气和尘卷风构成的总起沙量和降尘量在月、年变化都有极其显著的正相关，均通过了0.001极显著检验。
The vertical distribution of the dust aerosols can be reflected from the dustfall. The daily, monthly and annual dust emission amounts are calculated in the present research, based on the boundary layer observation and numerical simulation results conducted by using the WRF/Chem sandstorm model. Dust devil process is considered an important source of the dust emission. The relationship between the dust emission and natural dustfall is then analyzed. The research can be concluded as following:(1) There exists a significant positive correlation between the semi-quantitative number of sandy days and the monthly dustfall, yet further quantization of the dust sources is unavailable;(2) The temporal evolution of the model-calculated dust emission on sandy days and the total dustfall amount show a similar trend. The average contribution of the sand weather to the dust emission is given as 76%;(3) The contribution of dust devils to dust emission is 24%. When there is no sand weather, dust devil is the only source of the dustfall;(4) The monthly and annual variation of the dust emission resulted from sand weather and dust devils are obviously correlated to the variation of the dust fall amount, which both passed the significance test(P<0.001)
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