与一个简化辐射平衡模型一起,学习喷雾器直接辐射在与它的光性质和表面反射的关系强迫被执行,显示与变厚的喷雾器层,地球空气系统可以增加或变弱太阳辐射反照率,取决于喷雾器单身者散布的不同联合反照率( SSA ,ω_ 0 ),不对称现象因素(g),和表面反照率(α_ g )而非直接依靠喷雾器光学深度(δ),它独自就与反照率的改变的范围成比例有它的价值。由模型的 Asindicated 结果,喷雾器的系统的观察放射的性质被要求放射的强迫使喷雾器的量的学习直接。性质的观察研究在中国,基于 includingground 的 sunphotometer 喷雾器光学深度(AOD ) ,散布系数的比浊计喷雾器, aethalometer 喷雾器吸收系数,和 MODIS 上基于地面和空间大小被承担了检索产品的 AOD。Thesatellite 检索了 AOD 被验证对在 situ 阳光中,光度计测量了 AOD,显示为东方中国,给 AOD 的遥感是可接受的主要对在那里的更低的表面反射未付而为在中国的北方的差的植被表面反射可以在 AOD 检索被低估。然而,喷雾器遥感的计划的适当修正是可能的改进检索精确性。处于干燥状况散布反照率的喷雾器单身者从测量表面的散布和吸收系数在 0.80 附近。改进我们这个问题的理解基于更多的观察要求进一步的研究。
With a simplified radiation balance model, study is performed of aerosol direct radiation forcing in relation to its optical properties and surface reflectance, indicating that with the thickened aerosol layer the earth-atmosphere system may increase or weaken the solar radiation albedo, depending upon different combinations of aerosol single scattering albedo (SSA, ω^-o), asymmetry factor (g), and surface albedo (ag) rather than relying directly on the aerosol optical depth (δ), which has its value just in proportion to the changed range of albedo alone. As indicated by the model results, systematic observations of aerosol radiative properties are required to make quantitative study of aerosol direct radiative forcing. Observational research of the properties has been undertaken based on ground and space measurements over China, including ground-based sunphotometeraerosol optical depth (AOD), nephelometer-aerosol scattering coefficients, aethalometer-aerosol absorption coefficients, and MODIS products-retrieved AOD. The satellite retrieved AOD is validated against in situ sun photometer measured AOD, indicating that for eastern China remote sensing given AODs are acceptable owing mainly to lower surface reflectance there whereas for poor vegetation in the north of China the surface reflectance may be underestimated in AOD retrieval. However, appropriate modification of the scheme of aerosol remote sensing is likely to improve the retrieval accuracy. The aerosol single scattering albedo in dry condition is around 0.80 from surface-measured scattering and absorption coefficients. It requires further studies based on more observations to improve our understanding of the issue.