Worldwide Linke turbidity information
Worldwide Linke turbidity information
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发表时间：
2003-06
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通讯作者：
J. Remund;L. Wald;M. Lefèvre;T. Ranchin;J. Page
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作者：
J. Remund;L. Wald;M. Lefèvre;T. Ranchin;J. Page
本文描述了用于构建全球 Linke 浊度因子（TL，空气质量等于 2）数据库的算法和数据。必须执行两个主要步骤来获取信息：1. 汇总 TL 估计；2. 融合不同的背景层以构建 TL 地图。 TL 的估计有两种形式：要么代表特定地理位置并具有高精度，要么以大区域平均的网格数据形式提供。点信息是从测量的每小时光束和每日全球辐射的时间序列中收集的，并将其转换为 TL。从出版物和网络（如 AERONET）获得其他浊度量并将其转换为 TL。基本网格数据是美国宇航局兰利研究中心提供的每日全球辐射图。使用与地面站点相同的方法将每月晴空辐射转换为 TL。进一步的网格信息取自 NOAA 探路者气溶胶数据和 NASA NVAP。设计了一种算法来融合这两种类型的数据，并在规范投影和 5' 弧角单元中生成网格地图。这些最终地图应再现在特定位置观察到的值。插值的均方根误差为 0.73 TL 单位。
This paper describes the algorithms and data used to construct a worldwide Linke turbidity factor (TL, for an air mass equal to 2)database. Two main steps had to be performed to obtain the information: 1. Assembling estimates of TL and 2. fusing different background layers for the construction of the TL maps. The estimates of TL have two forms: either they stand for specific geographical locations and have a high accuracy, or they are available as gridded data averaged over large areas. Point information was gathered from measured time series of hourly beam and daily global radiation, which were transformed to TL. From publications and networks like AERONET other turbidity quantities were obtained and transformed to TL. The basic gridded data are the maps of daily global irradiation supplied by the NASA-Langley Research Center. The included monthly clear sky irradiations were converted to TL with the same method as for the ground sites. Further gridded information was taken from NOAA pathfinder aerosol data and NASA NVAP. An algorithm was devised to fuse these two types of data and to produce gridded maps in a canonical projection and 5' arc angle cells. These final maps should reproduce the values observed at specific locations. The root mean square error of the interpolation is 0.73 TL units.