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首页> 外文期刊>Dynamics of Atmospheres and Oceans >The role of the Indian Ocean in determining the tropical pacific SST response to radiative forcing in an idealized model
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The role of the Indian Ocean in determining the tropical pacific SST response to radiative forcing in an idealized model

机译：印度洋在理想化模型中确定热带太平洋SST反应对辐射强制的影响

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摘要

The complexity of the tropical climate system demands the development of a hierarchy of models to ensure our understanding of its response to anthropogenic forcing. The response of the tropical Pacific Ocean to radiative forcing has been studied previously with a box model. The model has provided insights into the tropical Pacific climate change that are otherwise not easily attainable. But that model only encompasses the tropical Pacific region. Recent studies have also shown that the Indian Ocean (IO) may be important in the response of the Pacific Walker circulation to radiative forcing, raising the need to expand the model to take into account the role of IO This study presents the results concerning the tropical Pacific response to radiative forcing from an expanded-box model that includes the tropical IO, which influences the tropical Pacific through an inter-basin SST gradient.The three-box model predicts an enhanced zonal SST gradient in tropical Pacific in response to the increased radiative forcing, similar to the previous two-box model. It is further noted that in the three-box model, a warmer IO relative to the Pacific enhances Pacific easterlies and subsequently strengthens the equatorial ocean circulation. Because of this ocean dynamical cooling, the warming response in the Pacific is effectively reduced in the three-box model that includes the role of IO compared with that in the two-box model. The role of the to warming trend in enhancing the Pacific trade winds is confirmed using an atmospheric general circulation model experiment. These results may help to fully explain the relatively small observed warming trend in the tropical Pacific compared to that in the tropical IO evident in 20th century SST reconstructions.
机译：热带气候系统的复杂性需要开发模型等级，以确保我们对其对人为强迫的反应的理解。以前用盒式模型研究了热带太平洋对辐射强制的反应。该模型提供了对热带太平洋气候变化的见解，以否则不易实现。但这种型号仅包括热带太平洋地区。最近的研究还表明，印度洋（IO）在太平洋休闲队流通的回应中可能是重要的辐射强迫，提高需要扩大模型的模型，以考虑到IO的作用本研究呈现出热带的结果从包括热带IO的扩展箱模型的辐射迫使辐射强制响应，这通过盆地SST梯度影响热带太平洋。三箱模型在热带太平洋中预测了热带太平洋的增强型地区，以响应增加辐射强制，类似于前一个双箱模型。还有进一步指出，在三箱模型中，相对于太平洋的较温暖的IO增强了太平洋东方，随后加强了赤道海洋循环。由于这种海洋动力学冷却，在三箱模型中，太平洋的变暖响应在三箱模型中有效地减少了IO的作用与双箱模型相比。使用大气通用循环模型实验确认了对加强太平洋贸易风的热化趋势的作用。与20世纪SST重建中的热带IO相比，这些结果可能有助于充分解释热带太平洋的相对较小的观察温暖趋势。

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