Observational evidence for cylindrically oriented zonal flows on Jupiter
Observational evidence for cylindrically oriented zonal flows on Jupiter
复制标题
木星上圆柱形定向纬向流的观测证据
DOI：
10.1038/s41550-023-02077-8
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发表时间：
2023
期刊：
影响因子：
14.1
通讯作者：
S. Bolton
中科院分区：
文献类型：
--
作者：
Y. Kaspi;E. Galanti;R. Park;K. Duer;N. Gavriel;D. Durante;L. Iess;M. Parisi;D. Buccino;T. Guillot;D. J. Stevenson;S. Bolton
木星的大气动力学主要是由强烈的纬向风所控制。自从朱诺号在木星进行第一次重力测量以来，低阶重力谐波（J_3-J_10）一直被用来确定在云层观测到的纬向风的深度和结构，从而限制了对这些谐波的宽纬度结构的深流的推断。在这里，使用的动力学的贡献在高纬度的重力约束，我们提出的重力谐波到J_40。我们发现，这些测量值与观测到的云面风所产生的重力谐波之间存在很好的相关性，这些云面风呈圆柱形向内延伸到~10^5 bar（3，000 km）的深度。这些测量结果提供了直接的证据，表明气流是沿着旋转轴的方向沿着向内渗透的，证实了自20世纪70年代以来一直在理论上假设的气流的圆柱性质。此外，这个详细的新重力谱使我们能够量化各种喷流对重力信号的贡献，显示出两个半球20°纬度附近强纬向流的主导地位。利用美国宇航局的朱诺使命测量，研究人员获得了木星重力场的新的高精度地图，并证实了这颗行星观测到的强大的东西向喷流在平行于行星自转轴的方向上向内渗透。
The atmospheric dynamics of Jupiter are dominated by strong zonal winds engulfing the planet. Since the first gravity measurements taken by Juno at Jupiter, the low-degree gravity harmonics ( J _3– J _10) have been used to determine the depth and structure of the zonal winds observed at the cloud level, limiting inferences on the deep flows to the wide latitudinal structure of these harmonics. Here, using constraints on the dynamical contribution to gravity at high latitude, we present the gravity harmonics up to J _40. We find an excellent correlation between these measurements and the gravity harmonics resulting from the observed cloud-level winds extending inwards cylindrically to depths of ~10^5 bar (3,000 km). These measurements provide direct evidence that the flows penetrate inwards along the direction of the spin axis, confirming the cylindrical nature of the flow, which has been postulated theoretically since the 1970s. Furthermore, this detailed new gravity spectrum allows us to quantify the contribution of the various jets to the gravity signal, showing the dominance of the strong zonal flows around 20° latitude in both hemispheres. Using NASA’s Juno mission measurements, researchers obtain a new high-precision map of Jupiter’s gravity field and confirm that the planet’s observed strong east–west jet streams penetrate inwards in a direction parallel to the planet’s spin axis.
影响因子：
3.2
作者：
Gastine, T.;Wicht, J.
通讯作者：
Wicht, J.