环流环的起源、演化和启示
Genesis, evolution, and apocalypse of Loop Current rings
摘要：
我们通过应用三个目标（即，基于海面高度（SSH）的卫星测高术测量的速度的相干拉格朗日涡旋探测方法。该方法揭示了材料漩涡的边界，承受拉伸或扩散，或其流体元素均匀旋转。这涉及到一项技术进步，使框架漩涡起源和启示录强劲和精确。我们发现，拉伸和扩散承受评估产生一致的结果，这表明与欧拉评估，确定与区域瞬时充满流线的SSH场的涡流有很大的差异。基于涡度的均匀旋转评估被认为是相当不稳定的，这表明预期寿命比所有其他评估产生的预期寿命短得多。
英文摘要：
We carry out assessments of the life cycle of Loop Current vortices, so-called rings, in the Gulf of Mexico by applying three objective (i.e., observer-independent) coherent Lagrangian vortex detection methods on velocities derived from satellite altimetry measurements of sea-surface height (SSH). The methods reveal material vortices with boundaries that withstand stretching or diffusion, or whose fluid elements rotate evenly. This involved a technology advance that enables framing vortex genesis and apocalypse robustly and with precision. We find that the stretching- and diffusion-withstanding assessments produce consistent results, which show large discrepancies with Eulerian assessments that identify vortices with regions instantaneously filled with streamlines of the SSH field. The even-rotation assessment, which is vorticity-based, is found to be quite unstable, suggesting life expectancies much shorter than those produced by all other assessments.
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