GIS Layer: Sea Salinity in the Australian Region

ESRI grids showing sea salinity, linearly interpolated from CARS2000 mean and seasonal fields to 0.1 degree spaced grid, at depths of 0, 150, 500, 1000 and 2000 metres. The loess filter used to create CARS2000 resolves at each point a mean value and a sinusoid with 1 year period (and in some cases a 6 month period sinusoid - the "semi-annual cycle".) The provided "annual amplitude" is simply the magnitude of that annual sinusoid. CARS is a set of seasonal maps of temperature, salinity, dissolved oxygen, nitrate, phosphate and silicate, generated using Loess mapping from all available oceanographic data in the region. It covers the region 100-200E, 50-0S, on a 0.5 degree grid, and on 56 standard depth levels. Higher resolution versions are also available for the Australian continental shelf. The data was obtained from the World Ocean Atlas 98 and CSIRO Marine and NIWA archives. It was designed to improve on the Levitus WOA98 Atlas, in the Australian region. CARS2000 is derived from ocean cast data, which is always measured above the sea floor. However, for properties which do not change rapidly near the sea floor, this would not lead to a significant error. All the limitations of CARS2000 also apply here.本数据集为基于CARS2000（CARS2000）平均场与季节场线性插值得到的海盐度ESRI栅格（ESRI grids），插值后网格间距为0.1度，深度层级涵盖0、150、500、1000及2000米。用于生成CARS2000的Loess滤波（Loess filter）可在每个点位拟合得到平均值与周期为1年的正弦分量，部分场景下还包含周期为6个月的正弦分量，即“半年周期循环”。本次提供的“年振幅”即为该年度正弦分量的模长。 CARS（CARS）是一套温度、盐度、溶解氧、硝酸盐、磷酸盐及硅酸盐的季节分布图集，通过对研究区域内所有可用海洋学数据执行Loess映射生成。该图集覆盖100°E~200°E、0°S~50°S的研究区域，采用0.5度网格与56个标准深度层级；澳大利亚大陆架区域还提供了更高分辨率的版本。 本数据集的数据来源为世界海洋图集98（World Ocean Atlas 98）、澳大利亚联邦科学与工业研究组织（CSIRO）海洋档案以及新西兰国家水与大气研究所（NIWA）档案。其设计初衷是在澳大利亚区域改进莱维图斯版世界海洋图集98（Levitus WOA98）的表现。 CARS2000源自海洋观测剖面数据，这类数据始终采集至海床上方。但对于海床附近变化平缓的海洋参数而言，该采样方式不会带来显著误差。CARS2000的所有局限性同样适用于本数据集。