Retrievals of Aerosol Size Distribution, Spherical Fraction, and Complex Refractive Index From Airborne In Situ Angular Light Scattering and Absorption Measurements
Retrievals of Aerosol Size Distribution, Spherical Fraction, and Complex Refractive Index From Airborne In Situ Angular Light Scattering and Absorption Measurements
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DOI：
10.1029/2018jd030009
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发表时间：
2019-07
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通讯作者：
W. R. Espinosa;J. V. Martins;L. Remer;O. Dubovik;Tatyana Lapyonok;D. Fuertes;Anin Puthukkudy;D. Orozco;L. Ziemba;K. Thornhill;R. Levy
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作者：
W. R. Espinosa;J. V. Martins;L. Remer;O. Dubovik;Tatyana Lapyonok;D. Fuertes;Anin Puthukkudy;D. Orozco;L. Ziemba;K. Thornhill;R. Levy
气溶胶模型，由粒径分布，复折射率，和球形分数，来自一个新的协同检索的空中原位角散射测量的偏振成像散射计和吸收测量的颗粒烟尘吸收光度计。所使用的数据包括相函数（F11）、偏振度（−F12/F11）和吸收系数（βabs），这些数据是在区域调查的排放和大气成分、云和气候耦合研究（SEAC 4 RS）和深对流云和化学（DC 3）实地活动期间在低相对湿度下测量的。广义检索的气溶胶和表面特性（GRASP）适用于这些测量，以获得粒子的特性，光学上与原始测量结果一致的摘要。然后使用分类方案对相应的检索结果进行分类。对DC 3测量结果进行的反演表明，在这次活动期间采样的风暴流入中存在大量的尘埃状气溶胶，尘埃的数量在很大程度上取决于下垫面特征。在SEAC 4 RS数据中，检索到的粒径分布被认为是非常相似的范围内的气溶胶类型，包括城市和工业，生物和生物质燃烧（BB）的排放量。发现这些气溶胶类型的平均精细模式体积中值半径为0.155 ≤ rvf ≤ 0.163μm，对数正态标准差为0.32 ≤ σf ≤ 0.36。然而，BB样品和其他颗粒类型的角散射模式之间存在一致的差异。GRASP检索主要将这些差异归因于BB样品（m532 nm <$1.55 +0.007i）相对于其他两个类别（m532 nm <$1.51 +0.004i）的真实的和虚部折射率升高。
Aerosol models, composed of size distribution, complex refractive index, and spherical fraction, are derived from a new synergistic retrieval of airborne in situ angular scattering measurements made by the Polarized Imaging Nephelometer and absorption measurements from the Particle Soot Absorption Photometer. The data utilized include phase function (F11), degree of polarization (−F12/F11), and absorption coefficient (βabs) measured at low relative humidities during the Studies of Emissions and Atmospheric Composition, Clouds, and Climate Coupling by Regional Surveys (SEAC4RS) and Deep Convection Clouds and Chemistry (DC3) field campaigns. The Generalized Retrieval of Aerosol and Surface Properties (GRASP) is applied to these measurements to obtain summaries of particle properties that are optically consistent with the original measurements. A classification scheme is then used to categorize the corresponding retrieval results. Inversions performed on the DC3 measurements indicate the presence of a significant amount of dust‐like aerosol in the inflow of storms sampled during this campaign, with the quantity of dust present depending strongly on the underlying surface features. In the SEAC4RS data, the retrieved size distributions were found to be remarkably similar among a range of aerosol types, including urban and industrial, biogenic, and biomass burning (BB) emissions. These aerosol types were found to have average fine mode volume median radii 0.155 ≤ rvf ≤ 0.163μm and lognormal standard deviations 0.32 ≤ σf ≤ 0.36. There were, however, consistent differences between the angular scattering patterns of the BB samples and the other particle types. The GRASP retrieval predominantly attributed these differences to elevated real and imaginary refractive indices in the BB samples (m532nm≈1.55+0.007i) relative to the two other categories (m532nm≈1.51+0.004i).