Titan trace gaseous composition from CIRS at the end of the Cassini-Huygens prime mission
Titan trace gaseous composition from CIRS at the end of the Cassini-Huygens prime mission
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DOI：
10.1016/j.icarus.2009.11.027
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发表时间：
2010-05-01
期刊：
影响因子：
3.2
通讯作者：
Romani, P. N.
中科院分区：
文献类型：
--
作者：
Coustenis, A.;Jennings, D. E.;Romani, P. N.
本文报告了卡西尼/CIRS在名义任务期间（2004-2008）进行的44次飞行中获得的所有最低点光谱的广泛研究结果。相对于之前的研究（Coustenis， A.和24位同事[2007]）。伊卡洛斯189,35-62，飞越TB-T10)，我们在这里提供了一个非常丰富的数据集，特别是在南北高纬度地区的更多数据，因此在这些地区推断的丰度更可靠。我们增强的高分辨率数据集使我们能够更精确地推断出土卫六整个圆盘上的化学成分。我们还包括一些分子改进的光谱数据和更新的温度分布。推断出所有气体种类的纬度分布。我们进一步测试了乙炔（C2H2）的垂直分布，主要来自CIRS四肢推断数据和目前的土卫六环流模型，并将我们所有气体丰度的结果与一维光化学辐射模型的预测结果进行比较，以检查化学反应和途径的可靠性。(C) 2009爱思唯尔公司版权所有。
This paper reports on the results from an extensive study of all nadir-looking spectra acquired by Cassini/CIRS during the 44 flybys performed in the course of the nominal mission (2004-2008). With respect to the previous study (Coustenis, A., and 24 colleagues [2007]. Icarus 189, 35-62, on flybys TB-T10) we present here a significantly richer dataset with, in particular, more data at high northern and southern latitudes so that the abundances inferred here at these regions are more reliable. Our enhanced high-resolution dataset allows us to infer more precisely the chemical composition of Titan all over the disk. We also include improved spectroscopic data for some molecules and updated temperature profiles. The latitudinal distributions of all of the gaseous species are inferred. We furthermore test vertical distributions essentially for acetylene (C2H2) from CIRS limb-inferred data and from current General Circulation Models for Titan and compare our results on all the gaseous abundances with predictions from 1-D photochemical-radiative models to check the reliability of the chemical reactions and pathways. (C) 2009 Elsevier Inc. All rights reserved.