A Simplified high resolution MODIS Aerosol Retrieval Algorithm (SARA) for use over mixed surfaces
A Simplified high resolution MODIS Aerosol Retrieval Algorithm (SARA) for use over mixed surfaces
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DOI：
10.1016/j.rse.2013.04.014
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发表时间：
2013-09-01
影响因子：
13.5
通讯作者：
Dubois, David
中科院分区：
文献类型：
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作者：
Bilal, Muhammad;Nichol, Janet E.;Dubois, David
气溶胶光学厚度(AOD)是柱状大气气溶胶含量的量度。卫星遥感已被用来以几至几十公里的空间分辨率反演陆地和海洋上的气溶胶光学厚度。在大多数情况下，辐射传输模型(RTM)被用来构建查找表(LUT)，以充当测量和物理量之间的映射。在目前的研究中，利用中分辨率成像光谱仪(MODIS)的测量数据开发了一种简化的气溶胶反演算法(SARA)，用于香港上空的高空间分辨率(500米)，而不使用LUT。相反，RTM计算直接应用于MODIS数据，气溶胶属性来自香港理工大学的一个本地城市气溶胶机器人网络(AERONET)站，地表反射率来自MOD09GA Level-2每日地表反射率产品。为了验证，将500米的SARA气溶胶和10公里空间分辨率的MODIS气溶胶产品(MOD04 C005)与香港国际机场的地面Microtop II太阳光度计、香港城市大学的天空辐射计和香港鹤嘴的AERONET站的数据进行了比较。从SARA反演的500m径向光学厚度与地面测量结果具有较高的一致性，平均相关系数接近0.964，均方根误差接近0.077，平均绝对误差接近0.065。SARA和MOD04C005AOD在香港市区和郊区均有良好的一致性，平均相关系数接近0.917，均方根误差接近0.087，最大平均误差接近0.072。结果表明，我们的简化AOD算法比MOD04 C005标准产品和其他已在香港测试的更高分辨率的算法更能描述香港上空的气溶胶条件。(C)2013 Elsevier Inc.保留所有权利。
Aerosol Optical Depth (AOD) is a measure of the columnar atmospheric aerosol content. Satellite remote sensing has been used to retrieve AOD over land and ocean at spatial resolutions of several to several tens of km. In most cases, a Radiative Transfer Model (RTM) is used to construct a look-up table (LUT) to act as a map between measurements and physical quantities. In the current study, MODerate resolution Imaging Spectroradiometer (MODIS) measurements were used to develop a Simplified Aerosol Retrieval Algorithm (SARA) for use over Hong Kong at high (500 m) spatial resolution, without using a LUT. Instead, RTM calculations were applied directly to the MODIS data, with the aerosol properties derived from a local urban Aerosol Robotic Network (AERONET) station at the Hong Kong Polytechnic University, and surface reflectance from the MOD09GA level-2 daily surface reflectance product. For validation, the SARA AOD at 500 m, along with the operational MODIS aerosol product (MOD04 C005) at 10 km spatial resolution, was compared with data from a ground-based Microtops II sun photometer at the Hong Kong International Airport, a Sky-radiometer at the City University of Hong Kong, and an AERONET station at Hong Kong Hok Tsui. The 500 m AOD retrieved from the SARA showed a high consistency with ground-based AOD measurements, with average correlation coefficient similar to 0.964, root mean square error (RMSE) similar to 0.077, and mean absolute error (MAE) similar to 0.065. The SARA AOD showed a good agreement with MOD04 C005 AOD over both urban and rural areas of Hong Kong, with average correlation coefficient similar to 0.917, RMSE similar to 0.087, and MAE similar to 0.072. The results demonstrate that our simplified AOD algorithm is better able to represent aerosol conditions over Hong Kong than the MOD04 C005 standard product as well as other higher resolution algorithms which have been tested over Hong Kong. (C) 2013 Elsevier Inc. All rights reserved.