Track of GPS-Drifter PIRATA-FR35_392

As part of its support for the preparation of future surface–current observation missions, CNES is funding the PIRATA–ODYSEA experiment, dedicated to studying ocean surface circulation in the equatorial Atlantic. Launched in March 2025 for several months, the campaign aims to bridge the gap between satellite observations—which target currents within the uppermost meter of the ocean—and the in-situ instruments typically used for calibration/validation (CAL/VAL), which operate at depths of several meters. The campaign also seeks to better characterize the diurnal variability of currents, a key source of aliasing for satellite measurements. The dataset comprises 40 Hereon Lagrangian surface drifters deployed along the equatorial line of the Atlantic Ocean.

为支持未来表层海流观测任务的筹备工作，法国国家空间研究中心（CNES）资助了PIRATA–ODYSEA实验，该实验旨在研究赤道大西洋海域的海洋表层环流。本次实验于2025年3月启动，持续数月，旨在填补两类观测数据间的空白：一类是针对海洋表层1米内海流的卫星观测，另一类是通常用于校准/验证（CAL/VAL）、工作深度为数米的原位观测仪器所获取的数据。本次实验还旨在更精准地刻画海流的日变化特征——这是卫星测量中混叠效应的关键来源之一。本数据集包含沿赤道大西洋海域布设的40台Hereon拉格朗日表层漂流浮标。