Response of Convectively Coupled Kelvin Waves to Surface Temperature Forcing in Aquaplanet Simulations

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Mu-Ting Chien, Daehyun Kim
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引用次数: 0

Abstract

This study investigates changes in the propagation and maintenance of convectively coupled Kelvin waves (KWs) in response to surface warming. We use a set of three aquaplanet simulations made with the Community Atmospheric Model version 6 by varying the sea surface temperature boundary conditions to represent the current climate as well as warmer (+4 K) and cooler (−4 K) climates. Results show that KWs accelerate at the rate of about 7.1%/K and their amplitudes decrease by 4.7%/K. The dampening of KWs with warming is found to be associated with a weakening of the internal thermodynamic feedback between diabatic heating and temperature anomalies that generates KW eddy available potential energy (EAPE). The phase speed of KWs closely matches that of the second baroclinic mode KW in −4 K, while the phase speed of KWs is approximately that of the first baroclinic mode KW in +4 K. Meanwhile, the coupling between the two baroclinic modes weakens with warming. We hypothesize that in −4 K, as the first and second baroclinic modes are strongly coupled, KWs destabilize by positive EAPE generation within the second baroclinic mode and propagate more slowly, following the second baroclinic mode KW phase speed. In +4 K, as the first and second baroclinic modes decouple, KWs are damped by negative EAPE generation within the first baroclinic mode and propagate faster, following the first baroclinic mode KW phase speed.

Abstract Image

水行星模拟中对凸耦合开尔文波对表面温度强迫的响应
本研究调查了对流耦合开尔文波(KWs)的传播和维持随海面变暖而发生的变化。我们利用共同体大气模式第 6 版进行了三组水行星模拟,通过改变海面温度边界条件来代表当前气候以及更暖(+4 K)和更冷(-4 K)的气候。结果表明,KWs 的加速度约为 7.1%/K,振幅下降了 4.7%/K。研究发现,KWs 随气候变暖而减弱与产生 KW 涡旋可用势能(EAPE)的非绝热加热和温度异常之间的内部热力学反馈减弱有关。KWs 的相位速度与 -4 K 时的第二巴氏模式 KW 的相位速度接近,而 KWs 的相位速度与 +4 K 时的第一巴氏模式 KW 的相位速度接近。我们推测,在 -4 K 时,由于第一和第二巴洛克利模式之间的耦合很强,KWs 在第二巴洛克利模式内产生的正 EAPE 使其失稳,并跟随第二巴洛克利模式 KW 的相位速度缓慢传播。在 +4 K 时,随着第一和第二巴氏模式的解耦,KW 因第一巴氏模式内产生的负 EAPE 而失稳,并跟随第一巴氏模式 KW 的相位速度加速传播。
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来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
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