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Assimilating altimetric data to control the tropical instability waves: an observing system simulation experiment study

机译：吸收高空数据以控制热带不稳定波：一项观测系统模拟实验研究

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摘要

Tropical instability waves (TIWs) are not easily simulated by ocean circulation models primarily because such waves are very sensitive to wind forcing. In this study, we investigate the impact of assimilating sea surface height (SSH) observations on the control of TIWs in an observing system simulation experiment (OSSE) context based on a regional model configuration of the tropical Atlantic. A Kalman filtering method with suitable adaptations is found to be successful when altimetric data are assimilated in conjunction with sea surface temperature and some in situ temperature/salinity profiles. In this rather realistic system, the TIW phase is roughly controlled with a single nadir observing satellite. However, a right correction of the TIW structure and amplitude requires at least two nadir observing satellites or a wide swath observing satellite. The significant impact of orbital parameters is also demonstrated: in particular, the Jason or GFO satellite orbits are found to be more suitable than the ENVISAT orbit. More generally, it is found that as soon as adequate sub-sampling exists (with periods of 5-10 days), the length of the repetitivity cycle of orbits does not have a significant impact.
机译：海洋环流模型不容易模拟热带不稳定波（TIW），这主要是因为此类波对风力非常敏感。在这项研究中，我们基于热带大西洋的区域模型配置，研究了在观测系统模拟实验（OSSE）上下文中同化海面高度（SSH）观测对TIWs控制的影响。当结合海面温度和一些原位温度/盐度剖面图吸收高空数据时，发现具有适当适应性的卡尔曼滤波方法是成功的。在这个相当现实的系统中，TIW阶段由单个天底观测卫星大致控制。但是，正确校正TIW的结构和振幅需要至少两颗最低点观测卫星或一幅宽幅的观测卫星。还证明了轨道参数的重大影响：特别是，发现Jason或GFO卫星轨道比ENVISAT轨道更合适。更普遍地，发现一旦存在足够的子采样（周期为5-10天），轨道重复周期的长度不会产生重大影响。

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