Evaluation of seven European aerosol optical depth retrieval algorithms for climate analysis
Evaluation of seven European aerosol optical depth retrieval algorithms for climate analysis
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DOI：
10.1016/j.rse.2013.04.023
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发表时间：
2015-06-01
影响因子：
13.5
通讯作者：
Pinnock, Simon
中科院分区：
文献类型：
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作者：
de Leeuw, Gerrit;Holzer-Popp, Thomas;Pinnock, Simon
卫星数据越来越多地用于提供基于观测的气溶胶对气候影响的估计。气溶胶cci项目是欧洲航天局气候变化倡议（Ca）的一部分，旨在从卫星数据中提供气溶胶的基本气候变量。利用AATSR（4）、MERIS（3）和POLDER资料，对8种气溶胶特性反演算法进行了评价，以确定它们对气候研究的适用性。这些算法中的每一个的主要结果是在几个波长处的气溶胶光学厚度（ADD），以及描述对于给定波长对的ADD的光谱变化的埃指数（AE）。其他气溶胶参数可能是从卫星观测反演的，本文不考虑。根据地面AERONET太阳光度计网络提供的独立并置观测数据和中分辨率成像光谱仪提供的“参考”卫星数据，对AOD和AE（AE仅适用于2级）进行了评价。这些工具包括与AERONET相比的12种和12种产品的统计数据，以及基于空间和时间相关性的评分。在本文中，我们描述了他们的使用在一个循环（RR）评估的四个月的数据，每个赛季在2008年一个月。数据量仅限于四个月，因为在处理更大的数据集之前，为改进算法和评估改进情况和现状作出了巨大努力。评价标准进行了讨论。结果表明，目前的欧洲气溶胶算法的现状相比，AERONET和中分辨率成像光谱仪和MISR数据。比较得出的初步结论是，分数是相似的，包括那些参考文献，但AATSR的覆盖率需要提高，进一步改进是可能的大多数算法。没有一个算法，包括引用，在任何地方都优于所有其他算法。AATSR数据可用于陆地和海洋的气溶胶光学厚度和声发射反演。PARASOL和MERIS算法之一已经评估了海洋，这两种算法提供了良好的结果。(C)2013 Elsevier Inc. All rights reserved.
Satellite data are increasingly used to provide observation-based estimates of the effects of aerosols on climate. The Aerosol-cci project, part of the European Space Agency's Climate Change Initiative (Ca), was designed to provide essential climate variables for aerosols from satellite data. Eight algorithms, developed for the retrieval of aerosol properties using data from AATSR (4), MERIS (3) and POLDER, were evaluated to determine their suitability for climate studies. The primary result from each of these algorithms is the aerosol optical depth (ADD) at several wavelengths, together with the Angstrom exponent (AE) which describes the spectral variation of the ADD for a given wavelength pair. Other aerosol parameters which are possibly retrieved from satellite observations are not considered in this paper. The AOD and AE (AE only for Level 2) were evaluated against independent collocated observations from the ground-based AERONET sun photometer network and against "reference" satellite data provided by MODIS and MISR Tools used for the evaluation were developed for daily products as produced by the retrieval with a spatial resolution of 10 x 10 km(2) (Level 2) and daily or monthly aggregates (Level 3). These tools include statistics for 12 and 12 products compared with AERONET, as well as scoring based on spatial and temporal correlations. In this paper we describe their use in a round robin (RR) evaluation of four months of data, one month for each season in 2008. The amount of data was restricted to only four months because of the large effort made to improve the algorithms, and to evaluate the improvement and current status, before larger data sets will be processed. Evaluation criteria are discussed. Results presented show the current status of the European aerosol algorithms in comparison to both AERONET and MODIS and MISR data. The comparison leads to a preliminary conclusion that the scores are similar, including those for the references, but the coverage of AATSR needs to be enhanced and further improvements are possible for most algorithms. None of the algorithms, including the references, outperforms all others everywhere. AATSR data can be used for the retrieval of AOD and AE over land and ocean. PARASOL and one of the MERIS algorithms have been evaluated over ocean only and both algorithms provide good results. (C) 2013 Elsevier Inc. All rights reserved.