Map: Silicate Annual Means in the Northern Marine Region

Map showing the annual mean of dissolved silicates in the Northern Marine Region. Silicate, 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. This map has 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.本图集展示了北部海域溶解硅酸盐的年平均分布特征。本次制图所用硅酸盐数据源自CARS2000平均场与季节场，经线性插值得到0.1度分辨率的网格数据，覆盖0、150、500、1000及2000米共5个深度层级。用于生成CARS2000数据集的Loess滤波（Loess filter）可在各网格点解析出平均值与周期为1年的正弦波动，部分场景下还可解析出周期为6个月的正弦波动（即“半年周期循环”）。本次提供的“年振幅”即为该年度正弦波动的幅值。CARS数据集包含温度、盐度、溶解氧、硝酸盐、磷酸盐及硅酸盐的季节分布图谱，其通过Loess映射法对研究区域内所有可用海洋学数据进行处理生成。该数据集覆盖东经100°至200°、南纬50°至0°的海域，采用0.5度分辨率网格，并包含56个标准深度层级。针对澳大利亚大陆架区域，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98》（World Ocean Atlas 98）以及CSIRO海洋学部与NIWA的档案馆藏。该数据集旨在针对澳大利亚海域优化Levitus编制的WOA98图集。本图集由CSIRO为国家海洋局制作，作为“国家海洋生物区域化”项目的组成部分，旨在持续推进自然资源规划与管理工作。