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Aerosol airmass type mapping over the Urban Mexico City region from space-based multi-angle imaging

机译：基于天基多角度成像的墨西哥城市区气溶胶气团类型映射

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Using Multi-angle Imaging SpectroRadiometer (MISR) and sub-orbital measurements from the 2006 INTEX-B/MILAGRO field campaign, in this study we explore MISR's ability to map different aerosol air mass types over the Mexico City metropolitan area. The aerosol air mass distinctions are based on shape, size and single scattering albedo retrievals from the MISR Research Aerosol Retrieval algorithm. In this region, the research algorithm identifies dust-dominated aerosol mixtures based on non-spherical particle shape, whereas spherical biomass burning and urban pollution particles are distinguished by particle size. Two distinct aerosol air mass types based on retrieved particle microphysical properties, and four spatially distributed aerosol air masses, are identified in the MISR data on 6 March 2006. The aerosol air mass type identification results are supported by coincident, airborne high-spectral-resolution lidar (HSRL) measurements. Aerosol optical depth (AOD) gradients are also consistent between the MISR and sub-orbital measurements, but particles having single-scattering albedo of ≈0.7 at 558 nm must be included in the retrieval algorithm to produce good absolute AOD comparisons over pollution-dominated aerosol air masses. The MISR standard V22 AOD product, at 17.6 km resolution, captures the observed AOD gradients qualitatively, but retrievals at this coarse spatial scale and with limited spherical absorbing particle options underestimate AOD and do not retrieve particle properties adequately over this complex urban region. However, we demonstrate how AOD and aerosol type mapping can be accomplished with MISR data over complex urban regions, provided the retrieval is performed at sufficiently high spatial resolution, and with a rich enough set of aerosol components and mixtures.
机译：使用多角度成像光谱辐射计（MISR）和2006年INTEX-B / MILAGRO野外活动的亚轨道测量，在这项研究中，我们探索了MISR绘制墨西哥城市区不同气溶胶空气类型的能力。气溶胶空气质量的区别基于MISR Research气溶胶检索算法的形状，大小和单个散射反照率。在该区域，研究算法根据非球形颗粒形状识别以粉尘为主的气溶胶混合物，而球形生物质燃烧颗粒和城市污染颗粒则通过颗粒大小来区分。在2006年3月6日的MISR数据中，基于检索到的微粒微物理特性，确定了两种不同的气溶胶空气质量类型，以及四种在空间上分布的气溶胶空气质量。气溶胶空气质量类型的识别结果得到了机载高光谱重合的支持激光雷达（HSRL）测量。 MISR和亚轨道测量值之间的气溶胶光学深度（AOD）梯度也是一致的，但是在检索算法中必须包括在558 nm处具有约0.7的单散射反照率的粒子，以便与污染占主导地位的气溶胶进行良好的绝对AOD比较空气质量。 MISR标准V22 AOD产品的分辨率为17.6 km，可定性捕获观察到的AOD梯度，但是在此粗糙的空间范围内进行的取回和有限的球形吸收颗粒选择，会低估AOD，并且无法在这个复杂的城市区域充分地获取颗粒特性。但是，我们演示了如何使用MISR数据在复杂的城市区域完成AOD和气溶胶类型映射，只要以足够高的空间分辨率以及足够丰富的气溶胶成分和混合物进行检索即可。

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