Radiative Forcing by Multicomponent Atmospheric Aerosols

小行星9625718 大气气溶胶粒子由固、液多组分相组成。 一些气溶胶化学成分是硫酸盐、硝酸盐、铵、钠、氯化物、水、烟尘、有机物和灰尘。 这些物质在不同大小的颗粒中分布不均匀。 因此，各种尺寸的颗粒的物理、化学和光学性质可能不同。不同大小的气溶胶颗粒内化学物质的不均匀分布是目前试图量化大气气溶胶直接强迫效应的模型中引入不确定性的因素。 在该奖项下进行的研究将支持开发一个气溶胶模型，该模型解释了塑造大气颗粒物尺寸分布和组成的主要过程。 气溶胶的光学特性，包括单次散射散射系数，相函数，不对称因子和上散射分数将被计算用于柱辐射传输模式。 辐射传输模式将用于计算短波和长波辐射场的直接气溶胶强迫。 PI将通过将模型结果与测量的气溶胶浓度和气溶胶光学特性进行比较来评估模型。 一旦经过测试，该模型将用于估计模型输入参数的不确定性对气溶胶直接强迫的影响。 * ATM-9625718

9625718 Pilinis Atmospheric aerosol particles consist of solid and liquid multicomponent phases. Some aerosol chemical constituents are sulfate, nitrate, ammonium, sodium, chloride, water, soot, organic matter, and dust. These species are not distributed evenly among particles of different sizes. As a result, the physical, chemical, and optical properties of particles of various sizes may differ. The nonhomogeneous distribution of chemical species within aerosol particles of different sizes are factors which currently introduce uncertainty into models which attempt to quantify direct forcing effects by atmospheric aerosols. Research conducted under this award will support the development of an aerosol model which accounts for the major processes that shape the size distribution and composition of atmospheric particles. Aerosol optical properties, including single scattering albedo, phase functions, asymmetry factors and upscatter fraction will be calculated for use in column radiative transfer models. The radiative transfer models will be used to calculate the direct aerosol forcing over shortwave and longwave radiation fields. The PI will evaluate the model by comparing model results with measured aerosol concentrations and aerosol optical properties. Once tested, the model will be used to estimate the effects of uncertainties in model input parameters to direct forcing due to aerosols. *** ATM-9625718