中文摘要：

为了认识青藏高原严重沙漠化将产生的沙尘气溶胶及其影响,利用全球气溶胶气候模式CAM3.1对青藏高原沙漠化进行了敏感性模拟试验,进而探讨了高原沙漠对东亚大气气溶胶的最大可能贡献。结果表明,青藏高原上潜在的起沙源区主要分布在临近柴达木盆地的高原西部、藏南地区以及青南高原;高原起沙量春季最大,秋季次之,冬季第三,夏季最小。沙漠化的高原除了显著增加了高原上大气沙尘气溶胶的浓度,也显著增加了中国中西部地区近地面大气边界层的沙尘气溶胶浓度,远距离传输至中国中西部地区、东伸到达中国东海岸,甚至朝鲜半岛、日本直至太平洋上空对流层中部的沙尘气溶胶浓度同样增加明显。青藏高原沙源在近源区（即青藏高原及周边地区）的高贡献主要在低层,而在远源区（如日本岛南部海域及中太平洋区域）的贡献主要在高层。高原沙尘气溶胶极易被扬升到西风带,成为全球最高效率的沙尘远程传输源地。青藏高原沙漠化可能使其成为全球重要的沙尘气溶胶源地。

英文摘要：

In order to understand the dust aerosols produced by the serious Qinghai-Xizang Plateau（QXP） desertification and its effect,sensitivity tests using the climate model CAM3.1 has been conducted in this paper,with the aim of exploring the greatest possible contribution of desertification over QXP to the east Asian atmospheric aerosol.The simulations show that the potential dust emission sources over the QXP are mainly distributed in the western plateau near to Qaidam Basin,southern Tibet,southern Qinghai Plateau;Sand emissions vary seasonally with the peak in spring,autumn second,winter third,minimum in summer.Besides the dust aerosol concentrations over the QXP emitted from the QXP are greatly enhanced,also dust aerosols significantly increased in the lower troposphere over central-western China and the mid-troposphere from central-western China,Korea,Japan to West Pacific.The contributions of the QXP-desertification to East Asian dust aerosols are high mainly in the lower-troposphere near to the QXP,while in the far-source region such as the south of Japan and the Middle Pacific region was highly in high-rise.Plateau dust aerosol could be easily ascended to westerlies,becoming the world＇s highest efficiency dust-distance transmission source.