Abstract In this paper, a 20-year (1991–2010) simulation of dust aerosol emission is conducted by using the global climate model CAM 5.1 (Community Atmosphere Model, version 5.1). The simulation results revealed that North Africa, the Arabian Peninsula and the Middle East, East Asia, Australia, and the other regions respectively account for 60%, 18%, 12%, 2.5% and 7.5% of the global dust aerosol emission. On this basis, the climatology of dust aerosol emission, deposition and transport in the major dust source regions of the world are characterized. The results show that the inter-annual trends of dust emissions and depositions in the four major source areas are basically consistent, and the seasonal variations of dust emissions, dry and wet depositions are stronger than inter-annual variations. The seasonal variations of emissions and total depositions are the strongest in East Asia and the weakest in North Africa. The strongest seasonal variation of wet deposition appears in North Africa and the weakest in Australia. The dry and wet deposition ratios vary significantly with season. East Asia is dominated by wet deposition, while other areas are dominated by dry deposition. The dust transport in four major dust regions is mainly affected by the circulation systems at each level, the free tropospheric (500 hPa) transport of dust aerosol is controlled by the mid-latitude westerlies, and the dust aerosol is predominantly transported from west to east. But, the transport of dust aerosols in the atmospheric boundary layer shows distinct regional characteristics, with weak inter-annual variation and strong seasonal variation.

中文翻译：

---

全球主要沙尘源区沙尘气溶胶气候特征及其输送

摘要 本文利用全球气候模型CAM 5.1（Community Atmosphere Model, version 5.1）对沙尘气溶胶排放进行了20年（1991-2010）模拟。模拟结果显示，北非、阿拉伯半岛和中东、东亚、澳大利亚等地区分别占全球沙尘气溶胶排放量的60%、18%、12%、2.5%和7.5%。在此基础上，表征了世界主要沙尘源区沙尘气溶胶排放、沉积和输送的气候特征。结果表明，四大源区沙尘排放和沉降的年际变化趋势基本一致，沙尘排放、干湿沉降的季节变化强于年际变化。排放量和总沉积量的季节性变化在东亚最强，在北非最弱。湿沉降的季节性变化最强出现在北非，最弱出现在澳大利亚。干湿沉降比随季节变化显着。东亚以湿沉降为主，其他地区以干沉降为主。四大沙尘区的沙尘输送主要受各级环流系统影响，沙尘气溶胶的自由对流层（500 hPa）输送受中纬度西风带控制，沙尘气溶胶主要由西向东输送。 . 但是，大气边界层中沙尘气溶胶的输送呈现出明显的区域特征，年际变化较弱，季节变化较强。