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A strategy for producing refined currents in the Equatorial Atlantic in the context of the search of the AF447 wreckage

机译：在搜寻AF447残骸的背景下在赤道大西洋产生精细海流的策略

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On the night of 1st June 2009, a Rio-Paris Air France flight (AF447) disappeared in a highly variable and poorly observed part of the western tropical Atlantic Ocean. The first debris was located 5days after the accident. Several reverse drift computations were conducted in order to define the likely position of the wreckage. Unfortunately, the performance of the operational ocean analyses available in the region of interest ranges from 80 to 100km of positioning error after 5days of inverse drift computation. In preparation of the third phase of research of the wreckage at sea, a series of numerical experiments was performed at Météo-France and Mercator Océan in an attempt to better compute the surface currents in the region and for the period of the accident of the AF447 (May and June 2009). Tailored high-resolution atmosphere and ocean reanalyses were first produced respectively at Météo-France and Mercator Océan. Several nested experiments were then performed with a small and flexible ocean model limited to the region of interest. The date of the initial conditions and the type of atmospheric forcing fields were varied in order to produce a small ensemble from which information on the sensitivity to these changes could be derived. Probabilistic and statistical combinations between model and observations were tested and a solution was finally selected by means of a comparison of drift computations with independent surface drift observations.
机译：2009年6月1日晚上，法国巴黎里约热内卢（AF447）的航班消失在西部热带大西洋的高度变化且观测不到的部分。事故发生5天后发现了第一批碎片。为了确定残骸的可能位置，进行了几次反向漂移计算。不幸的是，经过5天的反向漂移计算后，在感兴趣区域中可用的海洋分析操作的性能在80至100 km的定位误差范围内。在准备进行海上残骸研究的第三阶段时，法国气象局和墨卡托·奥塞恩进行了一系列数值实验，试图更好地计算该地区以及AF447事故期间的表面电流（2009年5月和2009年6月）。量身定制的高分辨率大气和海洋再分析分别是在法国巴黎和墨卡托·奥塞恩分别制作的。然后使用限于目标区域的小型且灵活的海洋模型进行了多次嵌套实验。改变初始条件的日期和大气强迫场的类型，以便产生一个小的整体，从中可以得出关于对这些变化的敏感性的信息。测试了模型和观测值之间的概率和统计组合，并最终通过将漂移计算与独立的表面漂移观测值进行比较，选择了一种解决方案。

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