The seasonal cycle of Titan's detached haze

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作者
Robert A. West
Benoît Seignovert
Pascal Rannou
Philip Dumont
Elizabeth P. Turtle
Jason Perry
Mou Roy
Aida Ovanessian
机构
[1] California Institute of Technology,Jet Propulsion Laboratory
[2] GSMA,Lunar and Planetary Laboratory
[3] UMR CNRS 7331,undefined
[4] Université de Reims Champagne-Ardenne,undefined
[5] Johns Hopkins University Applied Physics Laboratory,undefined
[6] University of Arizona,undefined
来源
Nature Astronomy | 2018年 / 2卷
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摘要
Titan's ‘detached’ haze, seen in Voyager images in 1980 and 1981 and monitored by the Cassini Imaging Science Subsystem (ISS) during the period 2004–2017, provides a measure of seasonal activity in Titan’s mesosphere with observations over almost half of Saturn’s seasonal cycle. Here we report on retrieved haze extinction profiles that reveal a depleted layer (having a diminished aerosol content), visually manifested as a gap between the main haze and a thin, detached upper layer. Our measurements show the disappearance of the feature in 2012 and its reappearance in 2016, as well as details after the reappearance. These observations highlight the dynamical nature of the detached haze. The reappearance seems congruent with earlier descriptions by climate models but more complex than previously described. It occurs in two steps, first as haze reappearing at 450 ± 20 km and one year later at 510 ± 20 km. These observations provide additional tight and valuable constraints about the underlying mechanisms, especially for Titan's mesosphere, that control Titan's haze cycle.
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页码:495 / 500
页数:5
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