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Jupiter's Equatorial Plumes and Hot Spots: Spectral Mapping from Gemini/TEXES and Juno/MWR
Journal of Geophysical Research: Planets ( IF 4.8 ) Pub Date : 2020-06-17 , DOI: 10.1029/2020je006399
L. N. Fletcher 1 , G. S. Orton 2 , T. K. Greathouse 3 , J. H. Rogers 4 , Z. Zhang 2 , F. A. Oyafuso 2 , G. Eichstädt 5 , H. Melin 1 , C. Li 6 , S. M. Levin 2 , S. Bolton 3 , M. Janssen 2 , H.‐J. Mettig 4 , D. Grassi 7 , A. Mura 7 , A. Adriani 7
Affiliation  

We present multiwavelength measurements of the thermal, chemical, and cloud contrasts associated with the visibly dark formations (also known as 5‐μm hot spots) and intervening bright plumes on the boundary between Jupiter's Equatorial Zone (EZ) and North Equatorial Belt (NEB). Observations made by the TEXES 5‐ to 20‐μm spectrometer at the Gemini North Telescope in March 2017 reveal the upper‐tropospheric properties of 12 hot spots, which are directly compared to measurements by Juno using the microwave radiometer (MWR), JIRAM at 5 μm, and JunoCam visible images. MWR and thermal‐infrared spectroscopic results are consistent near 0.7 bar. Mid‐infrared‐derived aerosol opacity is consistent with that inferred from visible‐albedo and 5‐μm opacity maps. Aerosol contrasts, the defining characteristics of the cloudy plumes and aerosol‐depleted hot spots, are not a good proxy for microwave brightness. The hot spots are neither uniformly warmer nor ammonia‐depleted compared to their surroundings at p <1 bar. At 0.7 bar, the microwave brightness at the edges of hot spots is comparable to other features within the NEB. Conversely, hot spots are brighter at 1.5 bar, signifying either warm temperatures and/or depleted NH3 at depth. Temperatures and ammonia are spatially variable within the hot spots, so the precise location of the observations matters to their interpretation. Reflective plumes sometimes have enhanced NH3, cold temperatures, and elevated aerosol opacity, but each plume appears different. Neither plumes nor hot spots had microwave signatures in channels sensing p >10 bars, suggesting that the hot spot/plume wave is a relatively shallow feature.

中文翻译:

木星的赤道羽状和热点:来自Gemini / TEXES和Juno / MWR的光谱映射

我们提供了与可见暗层(也称为5μm热点)以及木星赤道带(EZ)和北赤道带(NEB)之间边界上的亮羽相关的热,化学和云对比的多波长测量结果。2017年3月在双子座北望远镜的TEXES 5至20μm光谱仪上进行的观测揭示了12个热点的对流层特性,这些特性直接与Juno使用微波辐射计(MWR)JIRAM在5的测量值进行了比较μm和JunoCam可见图像。MWR和热红外光谱结果在0.7 bar附近保持一致。中红外衍生的气溶胶不透明度与可见反照率和5μm的不透明度图一致。气溶胶对比 浑浊的烟羽和气溶胶耗尽的热点的定义特征并不能很好地代表微波亮度。与周围环境相比,这些热点既不均匀变暖,也不消耗氨p <1巴。在0.7 bar时,热点边缘的微波亮度与NEB内的其他功能相当。相反,热点在1.5 bar时更亮,表明温度较高和/或深度处的NH 3耗尽。热点内的温度和氨在空间上是可变的,因此观测值的精确位置对其解释很重要。反射羽有时具有增强的NH 3,低温和较高的气溶胶不透明性,但每种羽表现为不同。羽状流和热点都没有在检测到p > 10 bar的通道中具有微波信号,这表明热点/泡沫波是一个相对较浅的特征。
更新日期:2020-08-11
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