【作者】 吴涧； 符淙斌； 蒋维楣； 刘红年； 赵润华；

【Author】 Wu Jian Fu Congbin Jiang Weimei Liu Hongnian Zhao Runhua Department of Atmospheric Science, Yunnan University, Kunming 650091 Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Science, Chinese Academy of Sciences, Beijing 100029 Department of Atmospheric Science, Nanjing University, Nanjing 210093

【机构】 云南大学大气科学系； 中国科学院大气物理研究所； 南京大学大气科学系；

【摘要】 为研究东亚地区矿物尘气溶胶的直接辐射效应,在区域气候模式RegCM3中加入起尘方案、建立矿物尘气溶胶输送模式,并将其辐射过程加入区域气候模式的辐射方案。通过对2001年3月-2002年3月的模拟发现:中国西北和蒙古国年平均地表起尘率在1μg／m2·s以上,最大达到90 μg／m2·s是东亚地区最主要的矿物尘气溶胶源地;东亚地区矿物尘气溶胶柱含量最大值达5 g／m2,出现在塔克拉马干沙漠和秦岭地区;气溶胶大气顶直接辐射射强追基本呈现大陆上为正海洋上正负均有的分布特征,区域平均辐射强迫在春夏秋冬分别为1．08,0．88,0．37,0．40 W／m2,短波辐射强迫在陆上为正海上正负均有,长波辐射强迫均为正值;四季的地表辐射强追分别为-5．64,-2．25,-1．37,-1．87 W／m2;辐射强迫数值对矿物尘气溶胶单次散射反照率的变化较敏感。更多还原

【Abstract】 To research the direct radiative effect of dust aerosols over East Asia region. An dust emission scheme, an transport model and radiative scheme of dust aerosol have been added into Regional Climate Model Version 3(RegCM3). Based on the simulation between March 2001 to February 2002, it has been found that north -west China and Mongolia are main dust sources of East Asia, whose emission rates exceed 1 μg/m2·s with maximum value of 90μg/m2·s; The maximum column burden of dust aerosol is about 5 g/m2, which emerges over Taklimakan desert and Qinling mountain; The direct radiative forcing at TOA is positive over land and negative over sea, and its regional average values in Spring, Summer, Autumn, Winter are 1.08, 0.88, 0.37, 0.40W/m2 respectively. The solar radiative forcing is also positive over land and negative over sea, but the infrared radiative forcing is positive in modeling region; The radiative forcing values at surface for four seasons are -5.64, -2.25, -1.37, -1.87W/m2 respectively. Radiative forcing will be affected deeply by the change of single scattering albedo of dust aerosol.更多还原