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首页> 外文期刊>Remote Sensing >Using Satellite Data to Represent Tropical Instability Waves (TIWs)-Induced Wind for Ocean Modeling: A Negative Feedback onto TIW Activity in the Pacific
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Using Satellite Data to Represent Tropical Instability Waves (TIWs)-Induced Wind for Ocean Modeling: A Negative Feedback onto TIW Activity in the Pacific

机译：使用卫星数据表示热带不稳定波（TIW）诱发的风以进行海洋建模：对太平洋TIW活动的负面反馈

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摘要

Recent satellite data and modeling studies indicate a pronounced role Tropical Instability Waves (TIW)-induced wind feedback plays in the tropical Pacific climate system. Previously, remotely sensed data were used to derive a diagnostic model for TIW-induced wind stress perturbations (τTIW), which was embedded into an ocean general circulation model (OGCM) to take into account TIW-induced ocean-atmosphere coupling in the tropical Pacific. While the previous paper by Zhang (2013) is concerned with the effect on the mean ocean state, the present paper is devoted to using the embedded system to examine the effects on TIW activity in the ocean, with τTIW being interactively determined from TIW-scale sea surface temperature (SSTTIW) fields generated in the OGCM, written as τTIW = αTIW·F(SSTTIW), where αTIW is a scalar parameter introduced to represent the τTIW forcing intensity. Sensitivity experiments with varying αTIW (representing TIW-scale wind feedback strength) are performed to illustrate a negative feedback induced by TIW-scale air-sea coupling and its relationship with TIW variability in the ocean. Consistent with previous modeling studies, TIW wind feedback tends to have a damping effect on TIWs in the ocean, with a general inverse relationship between the τTIW intensity and TIWs. It is further shown that TIW-scale coupling does not vary linearly with αTIW: the coupling increases linearly with intensifying τTIW forcing at low values of αTIW (in a weak τTIW forcing regime); it becomes saturated at a certain value of αTIW; it decreases when αTIW goes above a threshold value as the τTIW forcing increases further. This work presents a clear demonstration of using satellite data to effectively represent TIW-scale wind feedback and its multi-scale interactions with large-scale ocean processes in the tropical Pacific.
机译：最近的卫星数据和模型研究表明，热带不稳定波（TIW）引起的风反馈在热带太平洋气候系统中起着重要作用。以前，遥感数据用于导出TIW引起的风应力扰动的诊断模型（τ TIW ），该模型被嵌入到海洋总环流模型（OGCM）中，以考虑TIW引起的热带太平洋的海气耦合。尽管Zhang（2013）的前一篇论文关注的是对海洋平均状态的影响，但本文致力于使用τ TIW 来研究嵌入式系统对海洋TIW活性的影响。 >由OGCM中生成的TIW尺度海面温度（SST TIW ）字段交互式确定，写为τ TIW =α TIW · F（SST TIW ），其中α TIW 是一个标量参数，用来表示τ TIW 强迫强度。进行了变化的α TIW （代表TIW尺度的风反馈强度）的敏感性实验，以说明TIW尺度的海-气耦合引起的负反馈及其与海洋中TIW变异性的关系。与以前的模型研究一致，TIW风反馈趋向于对海洋中的TIW产生阻尼作用，并且τ TIW 强度与TIW之间通常呈反比关系。进一步表明，TIW尺度耦合不随α TIW 线性变化：随着在较低的α TIW <值下增强τ TIW 强迫，耦合线性增加。 / sub>（在弱τ TIW 强制机制中）;在一定的α TIW 值时饱和;当α TIW 超过阈值时，随着τ TIW 强迫的进一步增加，它减小。这项工作清楚地展示了如何使用卫星数据来有效表示TIW尺度的风反馈及其与热带太平洋大规模海洋过程的多尺度相互作用。

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