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Reconstruction of the upper ocean 3D dynamics from high-resolution sea surface height

机译：从高分辨率海平面高度重建上层海洋3D动力学

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摘要

The present study investigates the reconstruction of the 3D dynamics of a turbulent mesoscale eddy field driven at a depth by a baroclinic instability of the Phillips type. It uses a high-resolution primitive equation simulation as a testbed. The method of reconstruction is based on potential vorticity principles and extends an earlier approach (Lapeyre and Klein, J Phys Oceanogr 36:165–176, 2006) to a regime where the signature of surface density anomalies on the dynamics is weak. The crux and the originality of the reconstruction lie in the estimation from sea surface height and surface density anomalies of the interior quasigeostrophic potential vorticity (PV) anomalies and its subsequent inversion. The estimation of PV anomalies relies on the vertical correlation between PV anomalies and on the knowledge on stratification and horizontal gradients of background PV. PV anomalies are accurately estimated over the first 500 m of the water column and over a wide range of wavenumbers. Density anomalies play a minor role in the PV estimation, though their omission leads to an overestimation of PV by a factor of less than 2 at scales of order 20 km and less. Inversion of the estimated PV leads to a geostrophic streamfunction which in turn provides reliable reconstructions of the relative vorticity and vertical velocity (via the omega equation).
机译：本研究调查了由菲利普斯型斜压不稳定在一定深度驱动的湍流中尺度涡流场的3D动力学重构。它使用高分辨率的原始方程式仿真作为测试平台。重建的方法基于潜在的涡度原理，并将较早的方法（Lapeyre和Klein，J Phys Oceanogr 36：165-176，2006）扩展到了表面密度异常对动力学的影响较弱的区域。重建的关键和独创性在于根据内部准地转势涡度（PV）异常的海面高度和表面密度异常及其随后的反演进行估算。 PV异常的估计依赖于PV异常之间的垂直相关性以及背景PV的分层和水平梯度的知识。在水柱的前500 m以及广泛的波数范围内，可以准确估计PV异常。密度异常在PV估计中的作用很小，尽管忽略会导致20 km以下量级的PV高估2倍。估算的PV的反演导致地转流函数，进而提供了相对涡度和垂直速度的可靠重建（通过omega方程）。

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