The Subpolar Front of the Japan/East Sea. Part II: Inverse Method for Determining the Frontal Vertical Circulation
The Subpolar Front of the Japan/East Sea. Part II: Inverse Method for Determining the Frontal Vertical Circulation
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DOI：
10.1175/2009jpo4018.1
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发表时间：
2010
影响因子：
3.5
通讯作者：
L. Thomas;Craig M. Lee;Y. Yoshikawa
中科院分区：
文献类型：
--
作者：
L. Thomas;Craig M. Lee;Y. Yoshikawa
摘要本文提出了一种从高分辨率水文/速度调查中推断垂直速度的逆方法，并将其应用于几次冷空气爆发期间在日本/东海（JES）副极地锋收集的观测结果。该方法是不同的垂直速度推断的基础上的欧米茄方程的驱动机制的非地转流推断，而不是假设，因此是特别适用于风或浮力强迫上层洋流的摩擦，混合，惯性/超惯性运动，或高阶效应可以贡献沿着与剪切/应变的地转流，迫使垂直运动。在JES的副极地锋处推断出的垂直环流的振幅为O（100 m天-1），相比之下，欧米茄方程预测的垂直速度为0.20 m天-1。随时间变化的，近惯性运动驱动的风和修改的垂直涡度的锋喷流似乎是主要的…
Abstract An inverse method for inferring vertical velocities from high-resolution hydrographic/velocity surveys is formulated and applied to observations collected at the subpolar front of the Japan/East Sea (JES) taken during several cold-air outbreaks. The method is distinct from vertical velocity inferences based on the omega equation in that the driving mechanism for the ageostrophic flow is inferred rather than assumed and hence is particularly appropriate for application to wind- or buoyancy-forced upper-ocean currents where friction, mixing, inertial/superinertial motions, or higher-order effects can contribute along with shear/strain of the geostrophic flow to force vertical motions. The inferred vertical circulation at the subpolar front of the JES has amplitudes O(100 m day−1) compared to the ∼20 m day−1 vertical velocities predicted by the omega equation. Time-dependent, near-inertial motions driven by the winds and modified by the vertical vorticity of the frontal jet appear to be the primary ...