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首页> 外文期刊>Journal of oceanography >P-Vector inverse method evaluated using the modular ocean model (MOM)
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P-Vector inverse method evaluated using the modular ocean model (MOM)

机译：使用模块化海洋模型（MOM）评估的P向量逆方法

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Several major inverse methods (Stommel-Schott method, Wunsch method, and Bernoulli method) have been successfully developed to quantitatively estimate the geostrophic velocity at the reference level from hydrographic data. No matter the different appeance, they are based on the same dynamical sophistication: geostrophy, hydrostatic, and potential density (?) conservation (Davis, 1978). The current inverse methods are all based on two conservation principles: potential density and potential vorticity (q=f??/?z) and require β-turning. Thus, two necessary conditions can be incorporated into any inverse methods: (1) non-coincidence of potential density and potential vorticity surfaces and (2) existence of vertical turning of the velocity (β-turning). This can be done using the P-Vector, a unit vector in the direction of ▽?×▽q (Chu, 1994, 1995). The first necessary condition becomes the existence of the P-vector, and the second necessary condition leads to the existence of the P-vector turning in the water column. Along this line, we developed the P-vector inverse emthod with a pre-requirement check-up. The method was verified in this study using the Modular Ocean Model (MOM) from Pacanowskiet al. (1991) version of Bryan-Cox-Semtner ocean general circulation model (OGCM), which is based on the work of Bryan (1969). The statistically steady solutions of temperature and salinity from MOM are used as a “no-error data” set for computing absolute geostrophic velocities by the P-vector inverse method. Circulations are similar between the MOM statistically steady solutions and the P-vector solutions. Furthermore, the quantitative analysis shows that this inverse method has capability of picking up the major signal of the velocity field.
机译：已经成功开发了几种主要的反演方法（Stommel-Schott方法，Wunsch方法和Bernoulli方法）来从水文数据定量估计参考水平的地转速度。无论外观如何，它们都基于相同的动态复杂性：地球动力学，静水压力和势能密度（？）守恒（Davis，1978）。当前的逆方法都基于两个守恒原理：势密度和势涡度（q = f25 /？z），并且需要β转向。因此，可以将两个必要条件合并到任何反方法中：（1）势密度和势涡面的不重合;（2）速度垂直旋转（β旋转）的存在。可以使用P-Vector（在▽？×▽q方向上的单位矢量）完成此操作（Chu，1994，1995年）。第一个必要条件成为P向量的存在，第二个必要条件导致P向量在水柱中旋转。沿着这条线，我们开发了具有预需求检查功能的P向量逆模型。在这项研究中，使用Pacanowskiet等人的模块化海洋模型（MOM）验证了该方法。 （1991）是Bryan-Cox-Semtner海洋总环流模型（OGCM）的版本，该模型基于Bryan（1969）的工作。来自MOM的温度和盐度的统计稳定解被用作“无误差数据”集，用于通过P向量逆方法计算绝对地转速度。 MOM统计稳定解和P向量解之间的循环相似。此外，定量分析表明，该逆方法具有拾取速度场主信号的能力。

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