Aerosol airmass type mapping over the Urban Mexico City region from space-based multi-angle imaging
Aerosol airmass type mapping over the Urban Mexico City region from space-based multi-angle imaging
复制标题
DOI：
10.5194/acp-13-9525-2013
复制
发表时间：
2013-09
影响因子：
6.3
通讯作者：
F. Patadia;R. Kahn;J. Limbacher;S. Burton;R. Ferrare;C. Hostetler;J. Hair
中科院分区：
文献类型：
--
作者：
F. Patadia;R. Kahn;J. Limbacher;S. Burton;R. Ferrare;C. Hostetler;J. Hair
抽象的。在这项研究中，我们利用多角度成像光谱辐射计 (MISR) 和 2006 年 INTEX-B/MILAGRO 现场活动的亚轨道测量数据，探索 MISR 绘制墨西哥城都会区上空不同气溶胶气团类型的能力。气溶胶空气质量的区别基于 MISR 研究气溶胶反演算法的形状、大小和单散射反照率反演。在该区域中，研究算法根据非球形颗粒形状识别以灰尘为主的气溶胶混合物，而球形生物质燃烧和城市污染颗粒则根据颗粒大小进行区分。 2006 年 3 月 6 日的 MISR 数据中识别出两种不同的气溶胶气团类型（基于检索到的粒子微物理特性）和四种空间分布的气溶胶气团。气溶胶气团类型识别结果得到了机载高光谱分辨率激光雷达 (HSRL) 一致测量的支持。 MISR 和亚轨道测量之间的气溶胶光学深度 (AOD) 梯度也一致，但在 558 nm 处单散射反照率为 a0.7 的粒子必须包含在检索算法中，以便与污染为主的气溶胶气团产生良好的绝对 AOD 比较。 MISR 标准 V22 AOD 产品的分辨率为 17.6 公里，定性地捕获了观测到的 AOD 梯度，但在这种粗略的空间尺度和有限的球形吸收粒子选项下进行的检索低估了 AOD，并且无法在这个复杂的城市区域充分检索粒子属性。然而，我们演示了如何使用复杂城市地区的 MISR 数据来完成 AOD 和气溶胶类型映射，前提是以足够高的空间分辨率进行反演，并且具有足够丰富的气溶胶成分和混合物。
Abstract. 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 a0.7 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.