The Collection 6 MODIS aerosol products over land and ocean
The Collection 6 MODIS aerosol products over land and ocean
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DOI：
10.5194/amt-6-2989-2013
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发表时间：
2013-01-01
影响因子：
3.8
通讯作者：
Hsu, N. C.
中科院分区：
文献类型：
--
作者：
Levy, R. C.;Mattoo, S.;Hsu, N. C.
双中分辨率成像光谱仪（MODIS）传感器自2000年以来一直在Terra上飞行，自2002年以来一直在Aqua上飞行，创建了广泛的全球地球观测数据集。在这里，我们介绍了收集6（C6）的算法来检索气溶胶光学厚度（AOD）和气溶胶的大小参数从MODIS观测光谱反射率。虽然与之前的Collection 5（C5）版本相比没有重大变化，但有足够的变化对产品及其解释产生了重大影响。C6气溶胶数据集将由在不同表面类型上运行的三个独立的检索算法创建。这是两个“暗目标”（DT）算法，用于检索（1）在海洋（可见光和较长波长的黑暗）和（2）在植被/深色土壤的土地（可见光中的黑暗），加上“深蓝”（DB）算法最初开发的检索（3）在沙漠/干旱的土地（可见光中的明亮）。在这里，我们重点介绍DT-海洋和DT-陆地（# 1和# 2）。我们已经更新了中心波长，瑞利光学深度和气体（H2O，O-3，CO2等）的假设。吸收校正，同时放宽太阳天顶角限制（最多
The twin Moderate resolution Imaging Spectroradiometer (MODIS) sensors have been flying on Terra since 2000 and Aqua since 2002, creating an extensive data set of global Earth observations. Here, we introduce the Collection 6 (C6) algorithm to retrieve aerosol optical depth (AOD) and aerosol size parameters from MODIS-observed spectral reflectance. While not a major overhaul from the previous Collection 5 (C5) version, there are enough changes that there are significant impacts to the products and their interpretation. The C6 aerosol data set will be created from three separate retrieval algorithms that operate over different surface types. These are the two "Dark Target"(DT) algorithms for retrieving (1) over ocean (dark in visible and longer wavelengths) and (2) over vegetated/dark-soiled land (dark in the visible), plus the "Deep Blue"(DB) algorithm developed originally for retrieving (3) over desert/arid land (bright in the visible). Here, we focus on DT-ocean and DT-land (# 1 and # 2). We have updated assumptions for central wavelengths, Rayleigh optical depths and gas (H2O, O-3, CO2, etc.) absorption corrections, while relaxing the solar zenith angle limit (up to