HF Radar Ibiza data from date 2012-06-01

Continuous hourly coastal ocean surface current maps in the Ibiza Channel measured by High-Frequency Radars (HFR). HFR is nowadays the unique land-based remote sensing technology providing continuous maps of near-real surface currents (0.9 m) over wide areas (out of about 85 km from near shore) with high-spatial (3 km) and temporal resolution (hourly). The operation principle of HFRs for measuring coastal ocean surface currents is based on the Bragg resonant backscatter phenomenon: the HFR CODAR SeaSonde combined-antenna transmits electromagnetic waves with frequency of 13.5MHz (associated to wavelength of 22.2 m) and the ocean waves of half the transmitted electromagnetic wavelength (11.1 m) scatter the pulse back to the antenna. Two or more HFR sites are needed for computing the map of total surface current vectors in the overlapping coverage area."

本数据集为伊比萨海峡（Ibiza Channel）的高频雷达（High-Frequency Radars, HFR）实测逐小时近岸海洋表层流场图。高频雷达是目前唯一可在宽覆盖范围（离岸约85公里以外区域）获取近实时表层流场（0.9米量级）的陆基遥感技术，其空间分辨率达3公里，时间分辨率为逐小时。高频雷达测量近岸海洋表层流的工作原理基于布拉格共振后向散射现象：HFR CODAR SeaSonde组合天线发射频率为13.5MHz（对应波长22.2米）的电磁波，波长为发射电磁波一半（11.1米）的海洋波浪会将脉冲散射回天线。在重叠覆盖区域内合成完整表层流矢量场图，需至少两个及以上的高频雷达站点协同作业。