硫酸盐和烟尘气溶胶辐射特性及辐射强迫的模拟估算

The Simulation and Estimation of Radiative Properties and Radiative Forcing due to Sulfate and Soot Aerosols

利用已有的硫酸盐和烟尘气溶胶折射指数资料，精确计算了这两种气溶胶从太阳短波到红外谱段的辐射特性。然后．在ＬＬＮＬ化学输送模式（ＣＴＭ）模拟的硫酸盐和烟尘气溶胶资料及改进的气溶胶参数化基础上，在国内首次用ＧＣＭ估算了这两种气溶胶引起的全球辐射强迫。结果表明：（１）西欧是全球最大的硫酸盐辐射强迫中心最大值出现在夏季，达－５．０Ｗ／ｍ２；（２）烟尘强迫的最大中心出现在夏季的南美和非洲中南部，为４．０Ｗ／ｍ２；（３）南半球大陆人为气溶胶的强迫不容忽视；（４）某些地区人为气溶胶的强迫在量值上可与ＣＯ２等温室气体引起的强迫相比拟。

Using complex refractive index data of sulfate and soot aerosols, the radiative properties of the aerosols from 0.2-40 um wavelength were calculated by an accurate Mie scattering algorithm. Based on the mass concentration data of aerosols simulated by LLNL CTM model and the improved aerosol parameterization in GOALS / AGCM, the radiative forcing of the global anthropogenic sulfate and soot were estimated at first time in China. The results show that: (1) The largest center of the radiative forcing due to sulfate is located at West Europe in summer, and the central value is about -5.0 W / m2; (2) The largest value of the forcing due to soot occurs in South America and South and Central Africa in summer and amounts to 4.0 W/ m2, (3) The radiative forcing caused by anthropogenic aerosols in the Southern Hemisphere cannot be ignored; (4) The radiative forcing due to human activity in some areas can be comparable in magnitude with the forcing caused by greenhouse gases, such as CO2 etc.