DPM模型计算中国北方沙漠地区粉尘释放通量

Calculations of Dust Emission Flux in Northern Deserts of China by DPM Model

本文利用DPM(Dust Production Model)模型模拟计算了我国北方沙漠地区不同的土壤微团粒在不同的地表粗糙度和地表摩擦风速下的水平跃移通量、粉尘释放通量、粉尘释放效率以及在特定量中粉尘粒子的质量和数浓度的分布,并对上述计算结果进行了讨论和分析。通过与实际观测结果进行对比的粗糙度和地表摩擦风速下粉尘释放通量后发现二者基本一致,从而证明了DPM模型是可以用来初步模拟中国北方沙漠地区的粉尘释放过程,这将有利于进一步较准确得模拟沙尘的输送、沉降以及气候效应。

By using the DPM model, horizontal saltation fluxes and dust emission fluxes and sandblasting efficiencies of 11 kinds of soil aggregates in northern deserts of China are calculated under different roughness lengths and different wind friction velocities from 20 cm/s to 100 cm/s. And the mass and number distributions of dust particles in the emission fluxes are also calculated at invariable roughness length （Z0=0.1 cm） and friction velocity （U＊ = 50 cm/s）. The calculated results are analyzed and compared with the observational results. It is found that the calculated results are consistent with the observational ones. Thus it is identified that the DPM model can be used to simulate the procession of dust emission in northern deserts basically. This will be helpful to simulate the transportation, deposition and climate effects of dust aerosols more accurately in the future.