内部热强迫下木星赤道准四年振荡

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Pub Date : 2023-11-01 DOI:10.3847/1538-4357/acfca6
Yuchen Lian, Xianyu Tan, Yongyun Hu
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引用次数: 0

摘要

观测表明,在木星赤道平流层中存在着西/东交替的向下传播射流,其准周期在4 ~ 6年之间,这种现象通常被称为准四年振荡(quasyrennial oscillation, QQO)。本文通过向三维木星环流模型注入各向同性小尺度热扰动来模拟QQO。研究发现,内部热扰动能够激发出丰富的波,在两个半球的中高纬度地区产生赤道QQO和多股急流。产生类qqqo振荡的主要波型是纬向波数为10的波型。位涡的不均匀演化有利于赤道外纬向急流的出现。赤道外急流向赤道迁移,加强了赤道深部急流,导致了类qqo振荡的延长。
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Jupiter’s Equatorial Quasi-quadrennial Oscillation Forced by Internal Thermal Forcing
Abstract Observations have shown that there exists downward propagation of alternating westward/eastward jets in Jupiter’s equatorial stratosphere, with a quasi-period between 4 and 6 yr. This phenomenon is generally called the quasi-quadrennial oscillation (QQO). Here, we simulate the QQO by injecting isotropic small-scale thermal disturbances into a 3D general circulation model of Jupiter. It is found that the internal thermal disturbance is able to excite a wealth of waves that generate the equatorial QQO and multiple jet streams at the middle and high latitudes of both hemispheres. The dominant wave mode in generating the QQO-like oscillation is that with a zonal wavenumber of 10. The inhomogeneous evolution of potential vorticity favors the emergence of off-equatorial zonal jets. The off-equatorial jets migrate to the equator, strengthen the deep equatorial jets, and result in the prolonging of the QQO-like oscillations.
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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