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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Regional representativity of AERONET observation sites during the biomass burning season in South America determined by correlation studies with MODIS Aerosol Optical Depth
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Regional representativity of AERONET observation sites during the biomass burning season in South America determined by correlation studies with MODIS Aerosol Optical Depth

机译：通过与MODIS气溶胶光学深度的相关性研究确定了南美生物量燃烧季节AERONET观测站点的区域代表性

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摘要

This paper presents an analysis of ground-based Aerosol Optical Depth (AOD)observations by the Aerosol Robotic Network (AERONET) in South America from 2001 to 2007 in comparison with the satellite AOD product of Moderate Resolution Imaging Spectroradiometer (MODIS), aboard TERRA and AQUA satellites. Data of 12 observation sites were used with primary interest in AERONET sites located in or downwind of areas with high biomass burning activity and with measurements available for the full time range. Fires cause the predominant carbonaceous aerosol emission signal during the dry season in South America and are therefore a special focus of this study. Interannual and seasonal behavior of the observed AOD at different sites were investigated, showing clear differences between purely fire and urban influenced sites. An intercomparison of AERONET and MODIS AOD annual correlations revealed that neither an interannual long-term trend may be observed nor that correlations differ significantly owing to different overpass times of TERRA and AQUA. Individual anisotropic representativity areas for each AERONET site were derived by correlating daily AOD of each site for all years with available individual MODIS AOD pixels gridded to 1° x 1°. Results showed that for many sites a good AOD correlation (R2 > 0.5) persists for large, often strongly anisotropic, areas. The climatological areas of common regional aerosol regimes often extend over several hundreds of kilometers, sometimes far across national boundaries. As a practical application, these strongly inhomogeneous and anisotropic areas of influence are being implemented in the tropospheric aerosol data assimilation system of the Coupled Chemistry-Aerosol-Tracer Transport Model coupled to the Brazilian Regional Atmospheric Modeling System (CCATT-BRAMS) at the Brazilian National Institute for Space Research (INPE). This new information promises an improved exploitation of local site sampling and, thus, chemical weather forecast.
机译：本文介绍了2001年至2007年南美气溶胶机器人网络（AERONET）对地面气溶胶光学深度（AOD）观测结果的分析结果，并将其与TERRA和中分辨率成像光谱仪（MODIS）的卫星AOD产品进行了比较。 AQUA卫星。使用了12个观测点的数据，这些数据主要用于位于具有高生物量燃烧活性的地区或顺风地区的AERONET站点，并且在整个时间范围内均可进行测量。在南美洲的干旱季节，火灾是主要的碳质气溶胶排放信号，因此是本研究的重点。调查了在不同地点观测到的AOD的年际和季节行为，显示出纯火灾和受城市影响地点之间的明显差异。 AERONET和MODIS AOD年度相关性之间的比较表明，由于TERRA和AQUA的过桥时间不同，因此既没有观察到年度间的长期趋势，也没有显着相关性。每个AERONET站点的各个各向异性代表区域是通过将所有站点多年来的每日AOD与可用的单个MODIS AOD像素栅格化为1°x 1°进行关联得出的。结果表明，对于许多站点，大型区域（通常是强烈各向异性的区域）都具有良好的AOD相关性（R2> 0.5）。常见的区域气溶胶制度的气候区域通常延伸数百公里，有时甚至跨越国界。在实际应用中，这些强烈不均匀且各向异性的影响区域正在巴西国家气象局的“化学-气溶胶-漏斗耦合运输模型”对流层气溶胶数据同化系统与巴西区域大气建模系统（CCATT-BRAMS）的结合中实现空间研究所（INPE）。这些新信息有望改善对本地采样的利用，从而改善化学天气预报。

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