A tropical haze band in Titan's stratosphere
A tropical haze band in Titan's stratosphere
复制标题
泰坦平流层中的热带雾霾带
DOI：
10.1016/j.icarus.2009.10.021
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发表时间：
2010
期刊：
影响因子：
3.2
通讯作者：
De Kok R
中科院分区：
文献类型：
--
作者：
De Kok R
对卡西尼号成像科学子系统以及视觉和红外测绘光谱仪的近红外图像的检查揭示了土卫六雾霾结构的一个新特征：赤道以南雾霾造成的散射增加的窄带。该带似乎表明平流层下部的混合非常有限，这导致雾霾颗粒被困在那里。这可以解释图像中所见的两个半球之间的明显分离，即南北不对称。使用卡西尼号复合红外光谱仪测量的红外光谱，在 150 公里以上的平流层中也可以看到两个半球的分离。土卫六在低热带平流层的行为与地球热带平流层的行为非常相似，这暗示了可能存在的共同动力过程。
Inspection of near-infrared images from Cassini’s Imaging Science Subsystem and Visual and Infrared Mapping Spectrometer have revealed a new feature in Titan’s haze structure: a narrow band of increased scattering by haze south of the equator. The band seems to indicate a region of very limited mixing in the lower stratosphere, which causes haze particles to be trapped there. This could explain the sharp separation between the two hemispheres, known as the north–south asymmetry, seen in images. The separation of the two hemispheres can also be seen in the stratosphere above 150km using infrared spectra measured by Cassini’s Composite Infrared Spectrometer. Titan’s behaviour in the lower tropical stratosphere is remarkably similar to that of the Earth’s tropical stratosphere, which hints at possible common dynamical processes.