SWCV 非线性惯性波的发展机制

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Dynamics of Atmospheres and Oceans Pub Date : 2024-04-04 DOI:10.1016/j.dynatmoce.2024.101457
Chun Liu , Yueqing Li , Jun Sun , Yunlong Zhao , Jiaqi Yu
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引用次数: 0

摘要

基于对称圆柱坐标下的布西诺斯克近似公式,采用多尺度和扰动近似方法分析了中国西南大涡系统内部惯性重力波对中微尺度对流活动的非线性影响。结果得到两个主要结论:(1)当大气分层稳定时,西南低涡的惯性重力波也可能发展为有限振幅波包,具有振幅大、持续时间短的孤子特性,形成长窄波带,激活和组织西南低涡的大风、雷暴等强对流活动。当大气分层不稳定时,惯性重力波呈现衰减振荡特征,发展为振幅大、速度快的有限振幅波包,形成队列型波带,激活并组织西南低涡持续强降雨等极端天气。(2)在不同的大气分层条件下,热强迫对西南低涡惯性重力波的影响不同。在稳定的大气分层中,热强迫主要增强惯性重力波,对其持续时间无明显影响。而在不稳定的大气分层中,热强迫不仅加强了惯性重力波的增长,而且明显延长了其持续时间。该研究揭示了西南低涡内部惯性重力波的一些非线性特征,提高了理论界对西南低涡内部惯性重力波动力过程的关键作用及其对中-微尺度强对流天气影响机制的认识。
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Developmental mechanism of the SWCV nonlinear inertial waves

Based on the Boussinosq Approximation formulas in the symmetric, cylindric coordinates, the nonlinear effects of the internal inertial gravity waves on the meso-micro scale convective activities of Southwest China Vortex system are analyzed by the multi-scale and perturbation approximation methods. The results obtain two main conclusions: (1) When the atmospheric stratification is stable, the inertial gravity waves for Southwest China Vortex may also develop into finite-amplitude wave packet with a solitonic characteristics of large amplitude and short duration, forming a long-narrow wave band which activates and organizes severe convective activities like high wind and thunderstorm of Southwest China Vortex. When the atmospheric stratification is unstable, the inertial gravity waves exhibits attenuating oscillation characteristics and develops into finite-amplitude wave packet with large amplitude and fast speed, forming queue-type wave band that activates and organizes extreme weather like persistent heavy rainfall of Southwest China Vortex. (2) Under different atmospheric stratifications, the effects of thermal forcing on the inertial gravity waves for Southwest China Vortex are different. In the stable atmospheric stratification, the thermal forcing mainly intensifies the inertial gravity waves and has no significant effect on its duration. And in the unstable atmospheric stratification, the thermal forcing not only strengthens its growth but also obviously extends its duration. The research has revealed the some nonlinear characteristics of the internal inertial gravity waves for Southwest China Vortex, and improved the theoretical understanding about the critical role of the internal inertial gravity waves dynamic processes and its influence mechanism on the meso-micro scale severe convection weather for Southwest China Vortex.

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来源期刊
Dynamics of Atmospheres and Oceans
Dynamics of Atmospheres and Oceans 地学-地球化学与地球物理
CiteScore
3.10
自引率
5.90%
发文量
43
审稿时长
>12 weeks
期刊介绍: Dynamics of Atmospheres and Oceans is an international journal for research related to the dynamical and physical processes governing atmospheres, oceans and climate. Authors are invited to submit articles, short contributions or scholarly reviews in the following areas: •Dynamic meteorology •Physical oceanography •Geophysical fluid dynamics •Climate variability and climate change •Atmosphere-ocean-biosphere-cryosphere interactions •Prediction and predictability •Scale interactions Papers of theoretical, computational, experimental and observational investigations are invited, particularly those that explore the fundamental nature - or bring together the interdisciplinary and multidisciplinary aspects - of dynamical and physical processes at all scales. Papers that explore air-sea interactions and the coupling between atmospheres, oceans, and other components of the climate system are particularly welcome.
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