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Thermal structure and composition of the atmospheres of Jupiter and Titan from Cassini infrared observations.

机译:木星和土卫六大气的热结构和组成从卡西尼号红外观测中得出。

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摘要

The Cassini/Huygens spacecraft was launched in October 1997 for a four-year orbital tour of Saturn, its largest moon Titan, and its rings and many icy satellites, with the objective of investigating the origin, formation, and evolution of the solar system. Among the 12 instruments on the spacecraft is the unique Composite Infrared Spectrometer (CIRS), for observations of high-resolution, middle- and far-infrared spectra of planetary atmospheres in both nadir- and limb-viewing modes. A comprehensive analysis of the observed spectra provides a wealth of information about the thermal structure, composition, trace gas distributions, and the physical and dynamical processes in the observed atmospheres.; During the fly-by of Jupiter in December 2000--January 2001, on Cassini's long journey to Saturn, CIRS obtained a large amount of data on the infrared spectra of Jupiter's atmosphere. Since insertion of the spacecraft into Saturn orbit in July 2004, infrared spectra of Titan and Saturn's atmospheres are being obtained during close approaches. These observations constitute a observed dataset of mid- and far-infrared spectra with unprecedented spectral and spatial resolution, including the first limb observations of the atmosphere of Titan.; This dissertation deals with the analytical techniques and numerical modeling programs developed for the retrieval of thermal structure and trace gas distributions from infrared observations of planetary atmospheres. An algorithm for the retrieval of atmospheric properties such as temperature, composition, and aerosol opacity from limb and nadir observations is presented. Results of the analysis of CIRS observations of Jupiter, including global mapping of its thermal structure and trace gas distributions, as well as the astrophysically important nitrogen isotopic ratio 15N/ 14N, are presented.; Retrievals from Titan limb and nadir observations made during July 2004--February 2005 have generated maps of the stratospheric temperature and trace gas abundances. Vertical temperature and mixing ratio profiles of C2H2 and HCN retrieved from uniquely observed infrared spectra of Titan are presented and discussed.
机译:卡西尼号/惠更斯号航天器于1997年10月发射升空,进行了为期四年的土星,其最大的卫星土卫六,其环和许多冰冷的卫星的轨道飞行,目的是调查太阳系的起源,形成和演化。在航天器的12台仪器中,独特的复合红外光谱仪(CIRS)可在天底和四肢观察模式下观察行星大气的高分辨率,中红外和远红外光谱。对观察到的光谱的全面分析提供了有关观察到的大气中的热结构,成分,微量气体分布以及物理和动力学过程的大量信息。 2000年12月至2001年1月,在卡西尼号飞往土星的漫长旅程中,木星飞越期间,CIRS获得了有关木星大气红外光谱的大量数据。自从2004年7月航天器插入土星轨道以来,泰坦和土星大气层的红外光谱是在接近过程中获得的。这些观测结果构成了中红外光谱和远红外光谱的观测数据集,具有空前的光谱和空间分辨率,包括对泰坦大气的首次肢体观测。本文研究了为从行星大气的红外观测中获取热结构和痕量气体分布而开发的分析技术和数值模拟程序。提出了一种从肢体和最低点的观测值中检索大气特性(例如温度,成分和气溶胶不透明度)的算法。给出了木星CIRS观测结果的分析结果,包括其热结构和痕量气体分布的全球分布图,以及天文学上重要的氮同位素比15N / 14N。从2004年7月至2005年2月期间进行的Titan肢和最低点观测得到的反演产生了平流层温度和痕量气体丰度的图。介绍并讨论了从唯一观测到的泰坦红外光谱中检索到的C2H2和HCN的垂直温度和混合比分布图。

著录项

  • 作者

    Leclair, Andre.;

  • 作者单位

    The University of Alabama in Huntsville.;

  • 授予单位 The University of Alabama in Huntsville.;
  • 学科 Physics Astronomy and Astrophysics.; Atmospheric Sciences.; Remote Sensing.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 176 p.
  • 总页数 176
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;遥感技术;
  • 关键词

  • 入库时间 2022-08-17 11:40:52

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