Dust model intercomparison (DMIP) study over Asia: Overview
Dust model intercomparison (DMIP) study over Asia: Overview
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DOI：
10.1029/2005jd006575
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发表时间：
2006-06-28
影响因子：
4.4
通讯作者：
Westphal, D. L.
中科院分区：
文献类型：
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作者：
Uno, I.;Wang, Z.;Westphal, D. L.
[ 1]一项涉及亚洲上空8个沙尘排放/输送模式（DMIP）的相互比较研究已经完成。参与的沙尘模型利用各种沙尘排放方案、水平和垂直分辨率、数值方法和不同的气象模型。2002年春季发生了两次大的沙尘暴事件，并被用于DMIP研究。利用PM和NIES激光雷达的观测数据，对同一区域内的气象参数、沙尘排放通量和沙尘浓度（直径< 20 mm）进行了比较。我们发现，25%和75%的粉尘浓度之间的建模一般同意PM观测。模型的结果正确地捕捉到了主要的沙尘发作和停止时间在每个观测站点。然而，每种模型的最大浓度相差2 - 4倍。塔克拉玛干沙漠和蒙古的沙尘排放通量在模型之间差异很大，表明这些地区的沙尘源分配方案在不同的模拟组之间差异很大。这表明沙尘通量的测量和准确更新的土地利用信息是重要的，以改善这些地区的模型。中国北京和日本长崎沙尘垂直浓度廓线在模式间有较大的离散性（相差两倍以上）。北京地区的尺度沙尘廓线与激光雷达的消光廓线有较好的一致性。然而，对于长崎，缩放的尘埃轮廓不同意。这些结果表明，中国和日本之间的沙尘输送和清除过程的模拟是另一个重要的问题，在改善沙尘模拟。
[ 1] An intercomparison study involving eight dust emission/transport models over Asia ( DMIP) has been completed. Participating dust models utilize a variety of dust emission schemes, horizontal and vertical resolutions, numerical methods, and different meteorological models. Two huge dust episodes occurred in spring 2002 and were used for the DMIP study. Meteorological parameters, dust emission flux and dust concentration ( diameter < 20 mm) are compared within the same domain on the basis of PM and NIES lidar measurements. We found that modeled dust concentrations between the 25% and 75% percentiles generally agreed with the PM observations. The model results correctly captured the major dust onset and cessation timing at each observation site. However, the maximum concentration of each model was 2 - 4 times different. Dust emission fluxes from the Taklimakan Desert and Mongolia differ immensely among the models, indicating that the dust source allocation scheme over these regions differs greatly among the various modeling groups. This suggests the measurements of dust flux and accurate updated land use information are important to improve the models over these regions. The dust vertical concentration profile at Beijing, China, and Nagasaki, Japan, has a large scatter ( more than two times different) among the models. For Beijing, the scaled dust profile has a quite similar vertical profile and shows relatively good agreement with the lidar extinction profile. However, for Nagasaki, the scaled dust profiles do not agree. These results indicate that modeling of dust transport and removal processes between China and Japan is another important issue in improving dust modeling.