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Release of volatiles from a possible cryovolcano from near-infrared imaging of Titan

机译:Titan的近红外成像从可能的低温冷冻剂中释放出挥发物

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Titan is the only satellite in our Solar System with a dense atmosphere. The surface pressure is 1.5 bar ( ref. 1) and, similar to the Earth, N-2 is the main component of the atmosphere. Methane is the second most important component(2), but it is photodissociated on a timescale of 10(7) years ( ref. 3). This short timescale has led to the suggestion that Titan may possess a surface or subsurface reservoir of hydrocarbons(4,5) to replenish the atmosphere. Here we report near-infrared images of Titan obtained on 26 October 2004 by the Cassini spacecraft. The images show that a widespread methane ocean does not exist; subtle albedo variations instead suggest topographical variations, as would be expected for a more solid ( perhaps icy) surface. We also find a circular structure similar to 30 km in diameter that does not resemble any features seen on other icy satellites. We propose that the structure is a dome formed by upwelling icy plumes that release methane into Titan's atmosphere.
机译:土卫六是我们太阳系中唯一拥有密集大气的卫星。表面压力为1.5 bar(参考1),与地球相似,N-2是大气的主要成分。甲烷是第二重要的组分(2),但它在10(7)年的时间范围内被光解离(参考文献3)。这种短暂的时间尺度导致人们提出泰坦可能拥有地表或地下的碳氢化合物储层(4,5)来补充大气。在这里,我们报告了卡西尼号太空船于2004年10月26日获得的泰坦近红外图像。图像显示不存在广泛的甲烷海洋;相反,细微的反照率变化暗示了地形变化,这对于更坚实(也许冰冷)的表面是可以预期的。我们还发现了直径类似于30 km的圆形结构,该结构与其他冰冷卫星上看到的任何特征都不相似。我们认为该结构是由上升的冰柱形成的圆顶,该冰柱将甲烷释放到土卫六的大气中。

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