硫酸盐气溶胶直接辐射效应在线与离线模拟方法的比较  

COMPARISON OF ON-LINE AND OFF-LINE SIMULATION METHODS FOR DIRECT RADIATIVE FORCING OF ANTHROPOGENIC SULFATE

作　　者：吴涧[1,2] 蒋维楣[2] 刘红年[2] 王卫国[1] 罗燕[1] 

机构地区：[1]云南大学资源环境与地球科学学院大气科学系 [2]南京大学大气科学系,南京210093

出　　处：《气象学报》2004年第4期486-492,共7页Acta Meteorologica Sinica

基　　金：国家自然科学基金资助项目 (40 2 0 50 1 6和 40 1 650 0 1 );云南省自然科学基金资助项目 (2 0 0 3D0 0 1 1 )

摘　　要：利用区域气候模式RegCM 2与大气化学模式连接的模拟系统 ,比较了硫酸盐气溶胶辐射强迫的在线、离线模拟方法的硫酸盐柱含量、大气顶直接辐射强迫及地表温度响应。发现 :在线与离线模拟方法得到的硫酸盐柱含量、有无反馈大气顶直接辐射强迫和地表温度响应在许多地区有很大差异 ,这种差异在较小区域平均的尺度上更显著 ,在全区域平均尺度上也较为明显 ,是不能被忽略的 ;结果显示从硫酸盐含量到辐射强迫和地表温度响应逐渐加大的差异 ,说明硫酸盐气溶胶的辐射强迫与模拟方法有关 ,显示出较大的不确定性。An on-line coupled regional climate and atmospheric chemical model system has been modified and used to compare the on-line and off-line methods for direct radiative forcing and climate response simulation of sulfate aerosol over China area under the same model system and the same pollutant release inventory condition. The differences between sulfate column burden and TOA radiative forcing without climate response have been discussed based on four-month simulation, i.e. January, April, July and October in 2000. The results reveals the maximum difference of sulfate burden between on-line and off-line methods emerges in July, and the percentage ratio to on-line burden of the difference is less than 3% at the whole modeling area average scale, but there are about 13% to some regions. It has been concluded that the sulfate burden has less difference at large scale, but is obvious at regional scale. The radiative forcing at TOA without climate response has a variable range between -1.5 W/m2 and 1 W/m2 in the two methods, and positive value locates in the negative sulfate burden difference region. At the whole average scale, the difference of radiative forcing is about 11% to that of on-line result, but the difference is more than 30% to that of on-line result in the central and northern region. At the regional scale, the radiative forcing has been effected deeply by the model linking methods, and there is indeterminacy in regional scale radiative forcing. If climate response has been considered in the modeling, there would be -10—10 W/m2 difference between two TOA radiative forcing. Surface temperature response over China area have also been compared. The following results can be figured out based on the comparison: (1) It has been clarified that there is difference in most region between results of the on-line and off-line methods both in sulfate burden and in radiative forcing at TOA and in surface temperature response. The differences on each regional averaged results are more obvious than that of large scale a

关 键 词：硫酸盐气溶胶 区域气候模式 大气化学模式 地表温度响应 

分 类 号：X513[环境科学与工程—环境工程]