Loop Current Eddies (LCEs) are warm-core, anticyclonic rings that shed from the Loop Current and migrate westward providing kinetic and potential energy to the Gulf of Mexico (GoM). Typically, LCEs dissipate through interaction with the western shelf slope, other mesoscale eddies, and diapycnal mixing. Here, we explore a case where a LCE, Eddy Poseidon, encountered Hurricane Harvey in the northwest GoM in August 2017 causing its rapid dissipation. This interaction significantly reduced Poseidon’s areal extent, dynamic height, heat content, and kinetic energy. Using in situ observations and numerical model output, we explore Poseidon’s dissipation and show it was caused by a combination of processes. A rigorous cold wake formed along Poseidon’s east, strong hurricane-induced surface currents transported shelf water towards the eddy on its north and west sides, and heat was lost throughout the water column from Poseidon’s southern edge. Horizontal advection was greatest at the surface and decreased with depth—27% of heat lost from Poseidon occurred in the top 100 m and 47% from the top 200 m.

环流涡流 (LCE) 是暖核、反气旋环，从环流中脱落并向西迁移，为墨西哥湾 (GoM) 提供动能和势能。通常，LCE 会通过与西部陆架斜坡、其他中尺度涡流和渗流混合的相互作用而消散。在这里，我们探讨了一个案例，其中一个 LCE，Eddy Poseidon，于 2017 年 8 月在 GoM 西北部遇到飓风 Harvey，导致其快速消散。这种相互作用显着降低了波塞冬的面积、动态高度、热含量和动能。使用原位观测和数值模型输出，我们探索了波塞冬的耗散，并表明它是由多个过程的组合引起的。沿着波塞冬的东边形成了严酷的冷尾流，强烈的飓风引起的地表水流将陆架水输送到其北侧和西侧的涡流中，热量从波塞冬的南边缘在整个水柱中散失。水平对流在地表最大，随着深度的增加而减少——波塞冬损失的热量有 27% 发生在顶部 100 m，47% 发生在顶部 200 m。