EVOLUTION OF THE STRATOSPHERIC TEMPERATURE AND CHEMICAL COMPOSITION OVER ONE TITANIAN YEAR

EVOLUTION OF THE STRATOSPHERIC TEMPERATURE AND CHEMICAL COMPOSITION OVER ONE TITANIAN YEAR
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一泰坦年期间平流层温度和化学成分的演变

DOI:
10.1088/0004-637x/779/2/177
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发表时间:
2013
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
S. Stamogiorgos
S. Stamogiorgos
中科院分区:
--
文献类型:
--
作者:
A. Coustenis;G. Bampasidis;R. Achterberg;P. Lavvas;D. Jennings;C. Nixon;N. Teanby;S. Vinatier;F. Flasar;R. Carlson;G. Orton;P. Romani;E. Guandique;S. Stamogiorgos

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自1980年旅行者1号(V1)飞越以来,土卫六从太空和地面的探索已经持续了超过土星绕太阳一周的时间(2010年5月已经过去了一个泰坦年或29.5个地球年)。在这项研究中,我们寻找时间变化影响土卫六的大气热和化学结构在这一年内。我们处理了2006-2013年土卫六飞越期间拍摄的卡西尼/CIRS数据,发现了一个相当平静的赤道演变。相反,在北方纬度,我们发现在2009年中期的北方春分期间,丰度增加,随后下降(从2010年到2012年),恢复到与V1时代(泰坦星前一年)相似的值。在南半球,自2012年以来,我们看到几种痕量气体(C4 H2,C3 H4和HCN)的增加趋势,表明季节性大气逆转。当我们比较CIRS 2010和1980年V1/IRIS光谱(重新分析)时,我们发现有限的年际变化。从50°N到50°S,平流层温度和丰度一般恢复到1980年的水平,这表明太阳辐射是10 Au的主要能源,正如大气环流和光化学模型所预测的那样。它们涉及最复杂的烃类(C4 H2和C3 H4)。我们还考虑了来自地面和地球轨道观测站的数据(例如来自红外空间观测站,在这里重新访问),并讨论了泰坦年期间可能的大气成分趋势。
Since the Voyager 1 (V1) flyby in 1980, Titan's exploration from space and the ground has been ongoing for more than a full revolution of Saturn around the Sun (one Titanian year or 29.5 Earth years had elapsed in 2010 May). In this study, we search for temporal variations affecting Titan's atmospheric thermal and chemical structure within that year. We process Cassini/CIRS data taken during the Titan flybys from 2006–2013 and find a rather uneventful equatorial evolution. Conversely, at northern latitudes, we found enhanced abundances around the period of the northern spring equinox in mid-2009, which subsequently decreased (from 2010 to 2012), returning to values similar to those found in the V1 epoch, one Titanian year before. In the southern latitudes, since 2012, we see a trend for an increase of several trace gases (C4H2, C3H4, and HCN), indicative of a seasonal atmospheric reversal setting in. When we compare the CIRS 2010 and the 1980 V1/IRIS spectra (reanalyzed here), we find limited inter-annual variations. A return to the 1980 stratospheric temperatures and abundances is generally achieved from 50°N to 50°S, indicative of the solar radiation being the dominating energy source at 10 AU, as for the Earth, as predicted by general circulation and photochemical models. Exceptions concern the most complex hydrocarbons (C4H2 and C3H4). We also consider data from ground-based and Earth-orbiting observatories (such as from the Infrared Space Observatory, revisited here) and discuss possible atmospheric composition trends during a Titanian year.
DOI: 10.1016/j.jqsrt.2011.06.004
发表时间: 2011-10-01
影响因子: 2.3
作者:
Jacquinet-Husson, N.;Crepeau, L.;Vander Auwera, J.
通讯作者: Vander Auwera, J.
卡西尼号任务期间泰坦平流层的热结构和化学结构变化
DOI: 10.1088/0004-637x/760/2/144
发表时间: 2012
期刊: The Astrophysical Journal
影响因子: --
作者:
Bampasidis G
通讯作者: Bampasidis G