Jupiter's North Equatorial Belt expansion and thermal wave activity ahead of Juno's arrival

Jupiter's North Equatorial Belt expansion and thermal wave activity ahead of Juno's arrival
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朱诺号到来之前木星北赤道带的扩张和热波活动

DOI:
10.1002/2017gl073383
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发表时间:
2017
影响因子:
5.2
通讯作者:
Fletcher L
Fletcher L
中科院分区:
地球科学1区
文献类型:
--
作者:
Fletcher L

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2015年,木星北赤道带(NEB,7-17°N)的深色区域似乎向北扩展到邻近的区域,与3-5年的周期一致。甚大望远镜的热红外成像反演显示,在17-20°N的云顶,气溶胶不透明度适度变暖和减少,这表明在扩大的部门下沉和干燥。在此期间发现了两个新的热波:(i)在NEB中部的对流层上层热波(波数16-17,170毫巴时振幅2.5 K),与霾反射率相关;(ii)在20-30°N的平流层波(波数13-14,5毫巴时振幅7.3 K)。两者都是准静止的,局限于向东的纬向流区域,并且在形态上与以前的膨胀事件中观察到的波相似。
The dark colors of Jupiter's North Equatorial Belt (NEB, 7–17°N) appeared to expand northward into the neighboring zone in 2015, consistent with a 3–5 year cycle. Inversions of thermal‐IR imaging from the Very Large Telescope revealed a moderate warming and reduction of aerosol opacity at the cloud tops at 17–20°N, suggesting subsidence and drying in the expanded sector. Two new thermal waves were identified during this period: (i) an upper tropospheric thermal wave (wave number 16–17, amplitude 2.5 K at 170 mbar) in the mid‐NEB that was anticorrelated with haze reflectivity; and (ii) a stratospheric wave (wave number 13–14, amplitude 7.3 K at 5 mbar) at 20–30°N. Both were quasi‐stationary, confined to regions of eastward zonal flow, and are morphologically similar to waves observed during previous expansion events.
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