Sea Temperature Monthly and Annual Means in the Northern Marine Region

Temperature, 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 seafloor. However, for properties which do not change rapidly near the seafloor, this would not lead to a significant error. All the limitations of CARS2000 also apply here.

本数据集为温度场，基于CARS2000的平均场与季节场经线性插值生成，格点间距为0.1°，涵盖0、150、500、1000及2000米共5个深度层。用于构建CARS2000的局部加权回归平滑滤波器（Loess）可在每个格点处解析得到平均值与1年周期正弦信号，部分场景下还可拟合出半年周期的正弦信号（即"半年周期循环"）。本次提供的"年振幅（annual amplitude）"即为该年周期正弦信号的幅值。CARS是一套涵盖温度、盐度、溶解氧、硝酸盐、磷酸盐及硅酸盐的季节图集，通过对研究区域内全部可用海洋水文数据采用Loess映射法生成。该图集覆盖东经100°~200°、南纬50°~0°的海域，采用0.5°格距，并包含56个标准深度层。针对澳大利亚大陆架，还提供了更高分辨率的数据集版本。本数据集的数据源自世界海洋图集1998版（World Ocean Atlas 98）以及澳大利亚联邦科学与工业研究组织（CSIRO）海洋档案与新西兰国家水与大气研究所（NIWA）档案库。该数据集旨在针对澳大利亚海域优化利维图斯（Levitus）主编的世界海洋图集1998版（WOA98）。CARS2000源自海洋剖面观测数据，此类观测均采集于海底上方的水柱中。不过，对于海底附近变化平缓的海洋要素而言，该采样方式不会引入显著误差。CARS2000的所有局限性同样适用于本数据集。