RegCM-Dust模式对东亚一次沙尘暴天气过程模拟的效果检验

Validation of RegCM Dust model for simulating a sand-dust storm in East Asia

为检验区域气候模式与沙尘模式耦合模式RegCM Dust的性能,以2006年东亚地区一次沙尘暴过程为例,将模拟结果与观测资料进行对比,以检验模式对沙尘天气过程的模拟能力。结果表明:模式对沙尘暴过程的地面风场特征模拟效果较好,总体上重现了大风区的分布;地面沙尘浓度和沙尘光学厚度模拟结果与观测分布总体吻合。模式虽然是区域气候模式与沙尘模式耦合模式,但由于其内核是建立在中尺度数值模式MM4基础上,因此对天气过程尤其是沙尘天气过程具备较好的把握能力,对于沙尘天气过程预测具有良好的应用前景。

In order to validate the simulation performance of RegCM Dust model,a coupling model between regional climate model and sand storm model was operated,the simulation results of a sand storm weather process were compared with observation data.The simulated results indicated that the RegCM4 model can well simulate the surface wind field of the sand storm process and reproduce the distribution of gale area.At the same time,the simulated results of dust concentration and dust optical depth were consistent with the observed distribution.Although the RegCM4 Dust model was a coupled model between regional climate model and dust model,its kernel was based on the mesoscale numerical model MM4.Thus,it presented a good grasp capacity of the weather process,especially the dust weather process.