An intense narrow equatorial jet in Jupiter's lower stratosphere observed by JWST
An intense narrow equatorial jet in Jupiter's lower stratosphere observed by JWST
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JWST 观测到木星平流层下部强烈狭窄的赤道急流
DOI：
10.1038/s41550-023-02099-2
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发表时间：
2023
期刊：
影响因子：
14.1
通讯作者：
Hueso R
中科院分区：
文献类型：
--
作者：
Hueso R
木星大气层中有东西方向的纬向喷流，这些喷流随着纬度的变化而交替，这是由对流层水平的云层运动所追踪到的。在约100 mbar的冷对流层顶上方和下方，赤道大气被薄雾覆盖，用于表征平流层动力学的热红外观测失去了部分灵敏度。2022年7月詹姆斯·韦伯空间望远镜对木星的观测比以往任何时候都更详细地显示了这些薄雾，并揭示了在100-200 mbar(70 m S−1，比云层的纬向风快)100-200 mbar(70 m S−1)强烈赤道急流的存在，它被限制在赤道±3°范围内，并且位于平流层热振荡之下，这种热振荡至少持续0.1至40 mbar，并以多年为周期重复。这表明，新喷流是木星赤道平流层振荡的深层部分，因此强度可能会随着时间的推移而变化。
The atmosphere of Jupiter has east–west zonal jets that alternate as a function of latitude as tracked by cloud motions at tropospheric levels. Above and below the cold tropopause at ~100 mbar, the equatorial atmosphere is covered by hazes at levels where thermal infrared observations used to characterize the dynamics of the stratosphere lose part of their sensitivity. James Webb Space Telescope observations of Jupiter in July 2022 show these hazes in higher detail than ever before and reveal the presence of an intense (140 m s−1) equatorial jet at 100–200 mbar (70 m s−1faster than the zonal winds at the cloud level) that is confined to ±3° of the equator and is located below stratospheric thermal oscillations that extend at least from 0.1 to 40 mbar and repeat in multiyear cycles. This suggests that the new jet is a deep part of Jupiter’s Equatorial Stratospheric Oscillation and may therefore vary in strength over time.