GIS Layer: Incident Light (PAR) in the Australian Region

ESRI grid showing the mean incident light for each quarter. This data is the surface solar irradiance data obtained for NASA/GISS to allow the prodction of photosynthetically active solar irradiance fields to allow the calculation of primary productio using satellite ocean colour products. The information comes from the Internation Satellite Cloud Climatology Project (ISCCP) using C1 data from multiple geostationary and polar orbiting meterological satellites to provide a global view of the occurrence and properties of clouds. Atmospheric, cloud and surface data from ICSSP are used as input along with a scheme for computing clear-sky irradiance from the solar zenith angle, air properties, and surface reflectance. The scheme then uses simple cloud properties (cloud fraction, cloud optical thickness, and diffuse albedo) to produce total and photosynthetically active solar irradiance fields (Bishop and Rossow 1991; ISCCP Documentation of Cloud Data; Frouin et al. 1989). Input and output data fields are given in a 2.5° latitude and longitude grid. These grids have been produced by CSIRO for the National Oceans Office, as part of an ongoing commitment to natural resource planning and management through the 'National Marine Bioregionalisation' project.

本数据集为ESRI网格（ESRI Grid），展示了各季度的平均入射光量。该数据是美国国家航空航天局/戈达德太空研究所（NASA/GISS）获取的地表太阳辐照度数据，用于生成光合有效太阳辐照度场，以便通过卫星海洋水色产品计算初级生产力。其信息源自国际卫星云气候学计划（International Satellite Cloud Climatology Project，ISCCP），利用多颗地球静止轨道与极轨气象卫星的C1数据，实现全球云系发生情况与特性的全域观测。研究人员将ISCCP提供的大气、云系与地表数据，结合基于太阳天顶角、大气属性及地表反射率的晴空辐照度计算方案作为输入，随后通过简单云参数（云量、云光学厚度、漫反照率）生成总太阳辐照度与光合有效太阳辐照度场（Bishop与Rossow，1991；《ISCCP云数据文档》；Frouin等，1989）。输入与输出数据场采用2.5°经纬度网格格式。该数据集由澳大利亚联邦科学与工业研究组织（CSIRO）为澳大利亚国家海洋局制作，作为其通过"国家海洋生物区划"项目持续推进自然资源规划与管理工作的组成部分。