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首页> 外文会议>OCEANS 2011 >Validation of radar-based Lagrangian trajectories against surface-drogued drifters in the coral sea, Australia
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Validation of radar-based Lagrangian trajectories against surface-drogued drifters in the coral sea, Australia

机译：验证基于雷达的拉格朗日轨迹对澳大利亚珊瑚海中的地表漂流者的验证

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Surface current velocity fields measured every 10 min by a high-frequency ocean radar system (HF radar) located at the southern Great Barrier Reef (GBR), Australia, were used to compute Lagrangian trajectories (radar-based trajectories). The radar-based trajectories were validated against surface-drogued satellite tracked drifting buoys released on the shelf inside the reef lagoon and on the continental slope. Current speeds estimated from the drifters were typically within 5% to 8% of the HF radar currents extracted at the exact position occupied by the drifters for each sampled time, but some large current velocity biases occurred over short periods of time in shallow areas. Maximum separation distances between the drifter and radar-based tracks ranged from 5 km to 14 km on the shelf and from 4 km to 35 km on the slope for 24 tracks tracked up to one week. The reduction of the predictability of the radar-based trajectories occurred mostly in the vicinity of the islands of the reef matrix, suggesting the influence of small scale processes in the drifter paths not seen at the HF radar spatial resolution. A filtering procedure was applied a posteriori to the u and v components of the current velocity vectors calculated from non-quality controlled radial data obtained from the IMOS archive. Interpolation was used to cover temporal gaps less than 3 h allowing radar-based trajectories to be followed for up to 7 days. The use of radial data reprocessed and quality controlled by the Australian Coastal Radar Network (ACORN) extended the tracking period up to 13 days, reprocessing allows retrieval of some information lost in the non-quality controlled radial data.
机译：由位于澳大利亚大堡礁（GBR）南部的高频海洋雷达系统（HF雷达）每10分钟测量一次的表面流速场被用于计算拉格朗日轨迹（基于雷达的轨迹）。基于雷达的轨迹已针对礁湖泻湖内的陆架和大陆坡上释放的地表卫星跟踪的浮标进行了验证。从漂移器估算出的当前速度通常是每个采样时间在漂移器占据的确切位置提取的HF雷达电流的5％至8％之内，但是在浅水区在短时间内会出现一些大的电流速度偏差。漂移架和基于雷达的轨道之间的最大距离在架子上从5 km到14 km，在斜坡上从4 km到35 km（对于长达一周的24条轨道）。基于雷达的轨迹的可预测性降低主要发生在礁矩阵的岛附近，这表明小规模过程对HF雷达空间分辨率所没有的漂移路径的影响。对从IMOS档案库获得的非质量控制径向数据计算出的当前速度矢量的u和v分量进行了后验滤波。插值法用于覆盖不到3小时的时间间隔，从而可以跟踪基于雷达的轨迹长达7天。使用经澳大利亚海岸雷达网络（ACORN）重新处理和质量控制的径向数据将跟踪时间延长了13天，重新处理允许检索在非质量控制的径向数据中丢失的某些信息。

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