来自Herschel/HIFI观测的火星一氧化碳的初步结果
First results on Martian carbon monoxide from Herschel/HIFI observations
摘要:
我们报告的初步分析赫歇尔/HIFI的一氧化碳(CO)的火星大气层之间进行的2010年4月11日和16日的观测。我们选择了771 GHz的同位素^{13}CO和768 GHz的同位素C^{18}O的(7-6)转动跃迁,以反演温度的平均垂直分布和一氧化碳的平均体积混合比。得到的温度廓线与大气环流模式(GCM)的预测在45 km高度以下的温度廓线在小于5 K的范围内一致,然而,在60 km处显示出约12-15 K的低值。CO混合比确定为980 \pm 150 ppm,与2009年11月Herschel/SPIRE观测得出的900 ppm一致。
英文摘要:
We report on the initial analysis of Herschel/HIFI carbon monoxide (CO) observations of the Martian atmosphere performed between 11 and 16 April 2010. We selected the (7-6) rotational transitions of the isotopes ^{13}CO at 771 GHz and C^{18}O at 768 GHz in order to retrieve the mean vertical profile of temperature and the mean volume mixing ratio of carbon monoxide. The derived temperature profile agrees within less than 5 K with general circulation model (GCM) predictions up to an altitude of 45 km, however, show about 12-15 K lower values at 60 km. The CO mixing ratio was determined as 980 \pm 150 ppm, in agreement with the 900 ppm derived from Herschel/SPIRE observations in November 2009.
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