arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2210.08552physics.ao-ph
收藏

斯托克斯漂移不应被添加到海洋环流模式速度中

Stokes drift should not be added to ocean general circulation model velocities

Gregory LeClaire Wagner, Navid C. Constantinou, Brandon G. Reichl

AI总结:

本研究指出海洋表面输运研究中的欧拉平均假设不自洽,证明斯托克斯漂移不应添加到海洋环流模式速度中,并验证了拉格朗日平均假设的可行性。

摘要:

海洋表面输运研究常援引“欧拉平均假设”:忽略显式表面波效应的、不考虑波浪的环流模式所模拟的是经表面波振荡时间平均后的欧拉平均海洋速度。对欧拉平均假设的认可促使研究者通过将斯托克斯漂移添加到模式输出中,重构总拉格朗日平均表面速度。本文表明,欧拉平均假设并不自洽,因为当斯托克斯漂移相对于欧拉平均或拉格朗日平均速度的量级不可忽略时,不考虑波浪的模式无法准确模拟欧拉平均速度。我们得出结论,斯托克斯漂移不应被添加到海洋环流模式速度中。此外,我们通过理论论证,并将不考虑波浪的全球海洋模拟与显式波浪平均模拟进行对比,证明了替代性“拉格朗日平均假设”的可行性。研究发现,即便斯托克斯漂移的量级显著,我们的无波浪模式仍能准确模拟拉格朗日平均速度。

英文摘要:

Studies of ocean surface transport often invoke the "Eulerian-mean hypothesis": that wave-agnostic general circulation models neglecting explicit surface waves effects simulate the Eulerian-mean ocean velocity time-averaged over surface wave oscillations. Acceptance of the Eulerian-mean hypothesis motivates reconstructing the total, Lagrangian-mean surface velocity by adding Stokes drift to model output. Here, we show that the Eulerian-mean hypothesis is inconsistent, because wave-agnostic models cannot accurately simulate the Eulerian-mean velocity if Stokes drift is significant compared to the Eulerian-mean or Lagrangian-mean velocity. We conclude that Stokes drift should not be added to ocean general circulation model velocities. We additionally show the viability of the alternative "Lagrangian-mean hypothesis" using a theoretical argument and by comparing a wave-agnostic global ocean simulation with an explicitly wave-averaged simulation. We find that our wave-agnostic model accurately simulates the Lagrangian-mean velocity even though the Stokes drift is significant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑