Non-uniform global methane distribution in Titan’s troposphere evidenced by Cassini radio occultations

Non-uniform global methane distribution in Titan’s troposphere evidenced by Cassini radio occultations
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卡西尼号无线电掩星证明泰坦对流层中全球甲烷分布不均匀

DOI:
10.1016/j.icarus.2013.11.030
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发表时间:
2014
期刊:
影响因子:
3.2
通讯作者:
Tokano
Tokano
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tokano

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从卡西尼号无线电掩星中恢复的大气压力的全球分布在气象背景下被重新分析和解释。从射电掩星中提取土卫六的大气压力分布是不明确的,因为它取决于甲烷摩尔分数,而在惠更斯探测器入口处以外的对流层中,甲烷摩尔分数并不是准确知道的。在全球甲烷分布均匀的假设下,北半球冬季末大地水准面上的地面气压从南极到北极下降了∼15hpa(地面气压的1%)。然而,这种地面气压分布与观测到的对流云的时间和位置、地面风向和大气环流模式的预测不一致。如果假设上一季南(夏)半球的甲烷丰度比北半球(冬)半球的甲烷丰度高得多,则可以得到一个从夏半球到冬半球略有增加的更真实的气压分布。
The global distribution of atmospheric pressure retrieved from Cassini radio occultations is reanalyzed and interpreted in a meteorological context. The retrieval of Titan’s atmospheric pressure profile from radio occultations is ambiguous because it depends on the methane mole fraction, which is not precisely known in the troposphere beyond the entry site of the Huygens Probe. The surface pressure at the geoid level in late northern winter decreases from south pole to north pole by ∼15 hPa (1% of the surface pressure) if the data are retrieved under the assumption of a globally uniform methane distribution. However, this surface pressure distribution is inconsistent with the timing and location of observed convective clouds, surface wind direction and general circulation model prediction. A more realistic pressure distribution with a slight increase from the summer hemisphere to the winter hemisphere can be obtained if one assumes a substantially higher methane abundance in the southern (summer) hemisphere than in the northern (winter) hemisphere in the previous season.
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