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 June 2015 (NCEI Accession 0131956)

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.

本归档数据包包含源自高频雷达（High Frequency Radar）站的近实时海洋表面流速，亦称总矢量流速。所有流速均以水平经纬度网格形式排布。实测流速对应的海洋探测深度为0.3至2.5米，具体数值取决于雷达工作频率与水柱的垂直流速剖面。数据格式为netCDF，流速采用符合气候与预报（Climate and Forecast, CF）标准的变量进行表述，分别为海面东向海水流速surface_eastward_sea_water_velocity与海面北向海水流速surface_northward_sea_water_velocity。NDBC与SIO共同整合IOOS高频雷达网络的数据，每月将此类数据提交至NCEI，作为NCEI综合海洋观测系统数据组装中心（Integrated Ocean Observing System Data Assembly Centers, IOOS DACs）数据管理计划的组成部分。

基于岸基高频雷达站的海洋表面流速遥感技术，可在近岸区域提供连续、高分辨率的中尺度观测覆盖，从而填补了原位采样获取的单点观测数据与卫星获取的天气尺度低分辨率数据之间的业务化观测缺口。