Near-real-time surface ocean velocities derived from HF radar stations located along coastal waters of Puerto Rico/Virgin Islands, eastern US/Gulf of Mexico, Hawaii and western US during December 2015 (NCEI Accession 0141105)

This archival package contains near-real-time ocean surface velocities, also known as total vector velocities, derived from HF radar stations. The velocities are arranged in a horizontal latitude/longitude grid. Measured velocities are indicative of the upper 0.3 - 2.5 meters of the ocean depending on the operating frequency and the vertical velocity profile of the water column. Data are in netCDF and velocities are reported in the Climate and Forecast (CF) compliant variables, surface_eastward_sea_water_velocity and surface_northward_sea_water_velocity. NDBC, which with SIO assembles data from the IOOS HF Radar Network, submits these data monthly to NCEI as part of NCEI's Integrated Ocean Observing System Data Assembly Centers (IOOS DACs) Data Stewardship Program. Remote sensing of ocean surface velocity from shore-based HF radar sites bridges the operational observational gap between point samples obtained from in-situ sampling and synoptic scale relatively low resolution data obtained from satellites by providing continuous mesoscale coverage at relatively high resolution near the coast.本档案数据集包含源自高频雷达（HF radar）站的近实时海洋表面流速数据，此类数据也被称为全矢量流速。流速数据以水平经纬度网格形式排布。实测流速对应海洋上层0.3至2.5米的水体，具体深度取决于雷达工作频率与水体的垂直流速廓线。数据采用netCDF格式存储，流速以符合气候与预报（CF）标准的变量形式呈现，分别为海面东向海流速度（surface_eastward_sea_water_velocity）与海面北向海流速度（surface_northward_sea_water_velocity）。NDBC与SIO联合整合IOOS高频雷达网络的观测数据，并作为美国国家环境信息中心（NCEI）集成海洋观测系统数据集成中心（IOOS DACs）数据管理计划的一部分，每月将此类数据提交至NCEI。 岸基高频雷达站点开展的海洋表面流速遥感观测，通过在近岸区域提供连续、高分辨率的中尺度覆盖数据，填补了原位采样（in-situ sampling）获取的单点观测数据与卫星获取的天气尺度（synoptic scale）低分辨率数据之间的业务化观测空白。