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首页> 外文期刊>Atmospheric chemistry and physics >Aerosol climatology over Nile Delta based on MODIS, MISR and OMI satellite data
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Aerosol climatology over Nile Delta based on MODIS, MISR and OMI satellite data

机译：基于MODIS，MISR和OMI卫星数据的尼罗河三角洲气溶胶气候学

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Since 1999 Cairo and the Nile delta region have suffered from air pollution episodes called the "black cloud" during the fall season. These have been attributed to either burning of agriculture waste or long-range transport of desert dust. Here we present a detailed analysis of the optical and microphysical aerosol properties, based on satellite data. Monthly mean values of Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical depth (AOD) at 550 nm were examined for the 10 yr period from 2000-2009. Significant monthly variability is observed in the AOD with maxima in April or May (～0.5) and October (～0.45), and a minimum in December and January (～0.2). Monthly mean values of UV Aerosol Index (UVAI) retrieved by the Ozone Monitoring Instrument (OMI) for 4 yr (2005-2008) exhibit the same AOD pattern. The carbonaceous aerosols during the black cloud periods are confined to the planetary boundary layer (PBL), while dust aerosols exist over a wider range of altitudes, as shown by Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) aerosol profiles. The monthly climatology of Multi-angle Imaging SpectroRadiometer (MISR) data show that the aerosols during the black cloud periods are spherical with a higher percentage of small and medium size particles, whereas the spring aerosols are mostly large non-spherical particles. All of the results show that the air quality in Cairo and the Nile delta region is subject to a complex mixture of air pollution types, especially in the fall season, when biomass burning contributes to a background of urban pollution and desert dust.
机译：自1999年以来，开罗和尼罗河三角洲地区在秋季就遭受了称为“乌云”的空气污染事件。这些归因于农业废弃物的燃烧或沙漠尘土的远距离运输。在此，我们根据卫星数据对光学和微物理气溶胶特性进行详细分析。在2000年至2009年的10年期间，对550 nm的中分辨率成像光谱仪（MODIS）气溶胶光学深度（AOD）的月平均值进行了检查。在AOD中观察到明显的月变化，在4月或5月（〜0.5）和10月（〜0.45）达到最大值，在12月和1月（〜0.2）达到最小值。臭氧监测仪器（OMI）连续4年（2005-2008年）获得的紫外线气溶胶指数（UVAI）的月平均值显示了相同的AOD模式。乌云时期的碳质气溶胶仅限于行星边界层（PBL），而尘埃气溶胶则存在于更广泛的高度范围内，如云气溶胶激光雷达和红外探路者卫星观测（CALIPSO）气溶胶剖面图所示。多角度成像光谱辐射仪（MISR）的月度气候资料表明，乌云时期的气溶胶是球形的，具有较大比例的中小颗粒，而春季气溶胶则大多是大的非球形颗粒。所有结果都表明，开罗和尼罗河三角洲地区的空气质量受空气污染类型的复杂影响，尤其是在秋季，当生物质燃烧造成城市污染和沙漠尘埃的背景时。

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