Benthic Nutrients and Physical Water Properties Annual Mean (0.1 grid) in the Australian Region

Temperature, salinity, oxygen, silicate, phosphate, and nitrate, linearly interpolated from 1/8 degree spaced "high resolution" CARS2000 mean and seasonal fields to a 0.1 degree spaced grid. Values obtained for seafloor by vertical linear interpolation, which is possible because CARS2000 is mapped to one depth level below seafloor by least squares quadratic filter projection of horizontally and vertically adjacent data points. 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".) seafloor_10thdeg.nc.gz contains only mean values and not seasonal values as CARS do not resolve seasonal cycles below 1000m depth, and most of this region is deeper than 1000m. CARS is a set of seasonal maps of temperature, salinity, dissolved oxygen, nitrate, phosphate and silicate, generated using Loess mapping from all available oceanogrpahic 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.

本数据集包含温度、盐度、溶解氧、硅酸盐、磷酸盐与硝酸盐数据，所有数据均从1/8度间距的"高分辨率"CARS2000平均场与季节场经线性插值至0.1度间距的网格。海底点位的数值通过垂直线性插值获得，该操作可行的原因在于：CARS2000通过对水平与垂直相邻数据点进行最小二乘二次滤波投影，将数据映射至海底以下一个深度层位。用于构建CARS2000的局部加权回归平滑滤波器（Loess filter）可在每个点位解析出平均值与1年周期的正弦信号，部分点位还可解析出6个月周期的正弦信号，即"半年周期循环"。seafloor_10thdeg.nc.gz仅包含平均值而非季节值，这是因为CARS无法解析1000米以深海域的季节循环信号，而该区域绝大多数海域水深均超过1000米。CARS是一套温度、盐度、溶解氧、硝酸盐、磷酸盐与硅酸盐的季节分布图集，其基于该区域所有可用的海洋学观测数据，通过局部加权回归映射（Loess mapping）方法构建而成。该图集覆盖东经100°至200°、南纬50°至0°的海域，采用0.5度间距网格，包含56个标准深度层位。澳大利亚大陆架区域还提供更高分辨率的CARS数据集版本。本数据集的数据源自《世界海洋图集98》（World Ocean Atlas 98）以及CSIRO海洋研究档案与NIWA档案库。该数据集专为澳大利亚海域设计，旨在优化Levitus WOA98图集（Levitus WOA98 Atlas）的分析效果。