Sensitivity of western Pacific subtropical high to regional sea surface temperature changes

IF 4 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
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Abstract

The western Pacific subtropical high (WPSH) exerts significant influence on the climate of the Pacific region and East Asia. In this study, we systematically examined the responses of the WPSH intensity and position to regional sea surface temperature (SST) changes using idealized SST patch experiments with a climate model. Our findings reveal that the WPSH intensity is most sensitive to northern tropical SST during the boreal summer. Specifically, warming in the tropical Indian Ocean, eastern Pacific, and tropical North Atlantic contributes to a strengthening of the WPSH, whereas warming in the tropical western Pacific leads to its weakening. SST warming enhances local convergence and convection, which can modify the WPSH intensity via modulating the strength of tropical zonal circulation. Additionally, it is found that the SST-induced enhancement (weakening) of the WPSH is always accompanied with a westward extension (eastward retreat) of the WPSH. Furthermore, the response of the WPSH to tropical SST changes exhibits nonnegligible nonlinearity, which indicates the importance of multi-ocean interaction in determining the WPSH response to global surface warming.

西太平洋副热带高压对区域海面温度变化的敏感性
西太平洋副热带高压(WPSH)对太平洋地区和东亚的气候有重要影响。在这项研究中,我们利用气候模式的理想化 SST 补丁实验,系统地研究了 WPSH 强度和位置对区域海表温度变化的响应。我们的研究结果表明,在北方夏季,WPSH 强度对热带北部 SST 最为敏感。具体来说,热带印度洋、东太平洋和热带北大西洋的变暖会导致 WPSH 的增强,而热带西太平洋的变暖则会导致 WPSH 的减弱。海温变暖会增强局地辐合和对流,从而通过调节热带带环流的强度来改变 WPSH 的强度。此外,研究还发现,由 SST 引起的 WPSH 增强(减弱)总是伴随着 WPSH 的西伸(东退)。此外,WPSH 对热带海温变化的响应表现出不可忽略的非线性,这表明多海洋相互作用在决定 WPSH 对全球地表变暖响应方面的重要性。
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来源期刊
Global and Planetary Change
Global and Planetary Change 地学天文-地球科学综合
CiteScore
7.40
自引率
10.30%
发文量
226
审稿时长
63 days
期刊介绍: The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.
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