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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Aerosol optical depth and land surface reflectance from multiangle AATSR measurements: global validation and intersensor comparisons
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Aerosol optical depth and land surface reflectance from multiangle AATSR measurements: global validation and intersensor comparisons

机译：来自多角度AATSR测量的气溶胶光学深度和陆地表面反射率：全局验证和传感器间比较

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摘要

This paper presents the results and satellite intercomparisons for the retrieval of aerosol optical depth (AOD) and land surface bidirectional reflectance using the Multiangle Advanced Along-Track Scanning Radiometer (AATSR). The algorithm developed is based on inversion of a physical model of light scattering that requires no a priori knowledge of the land surface. The model is evaluated for a number of sites around the world to test its operation over a range of aerosol types and land covers including dark and bright surfaces. Validation is performed using Aerosol Robotic Network ground-based sun-photometer measurements and by intercomparison with independent estimates of AOD derived from spaceborne instruments including Multiangle Imaging Spectroradiometer (MISR), Moderate Resolution Imaging Spectroradiometer (MODIS), and Total Ozone Mapping Spectrometer (TOMS) aerosol products. Results show good agreement (Pearson's correlation coefficient r/sup 2/=0.70 for all sites combined) between the AATSR-derived estimates of AOD and the sun-photometer measurements. There is also a high correlation (r/sup 2/=0.84) between the AATSR- and MISR-derived AOD estimates, but the correlations of the AATSR-derived AOD with MODIS-derived AOD and TOMS aerosol index are lower. In addition, the ability of the sensor to discriminate between different aerosol types is evaluated. Moreover, the estimates of the aerosol properties are used for atmospheric correction of the top-of-atmosphere reflectance. The AATSR surface reflectances are compared with the MODIS bidirectional reflectance distribution function/Albedo and MISR surface products and are shown to correspond with root-mean-square errors of 0.03 and 0.06 or better, respectively. The retrieval method is applied on an image basis resulting in an image of surface reflectance and a separate map of AOD. A map of AOD at 550 nm covering the Sahel and southern Sahara region is presented to demonstrate operation at regional and potentially global scales.
机译：本文介绍了使用多角度高级沿航迹扫描辐射计（AATSR）检索气溶胶光学深度（AOD）和陆地表面双向反射率的结果和卫星比较。开发的算法基于光散射的物理模型的求逆，该模型不需要先验地表知识。对模型在世界各地的许多地点进行了评估，以测试其在各种气溶胶类型和包括黑暗和明亮表面的土地覆盖范围内的运行情况。验证使用Aerosol机器人网络的地面日光光度计进行测量，并与来自包括多角度成像光谱仪（MISR），中分辨率成像光谱仪（MODIS）和总臭氧图谱仪（TOMS）在内的星载仪器得出的AOD的独立估计值进行比较。气雾剂产品。结果表明，由AATSR得出的AOD估算值与日光光度计测量值之间具有很好的一致性（Pearson相关系数r / sup 2 / = 0.70，对于所有组合位置而言）。 AATSR和MISR得出的AOD估算值之间也有很高的相关性（r / sup 2 / = 0.84），但AATSR得出的AOD与MODIS得出的AOD和TOMS气溶胶指数之间的相关性较低。另外，评估了传感器区分不同气溶胶类型的能力。此外，气溶胶特性的估计值用于大气顶反射率的大气校正。将AATSR表面反射率与MODIS双向反射率分布函数/反照率和MISR表面积进行比较，并显示分别对应于0.03和0.06或更好的均方根误差。以图像为基础应用检索方法，从而得到表面反射率图像和单独的AOD图。展示了覆盖萨赫勒地区和撒哈拉南部地区的550 nm AOD图，以展示在区域和全球范围内的运行情况。

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