The abundance profile of CO in Neptune's atmosphere
The abundance profile of CO in Neptune's atmosphere
复制标题
海王星大气中二氧化碳的丰度分布
DOI：
10.1016/j.icarus.2006.08.025
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发表时间：
2007
期刊：
影响因子：
3.2
通讯作者：
G. Orton
中科院分区：
文献类型：
--
作者：
B. Hesman;G. Davis;H. Matthews;G. Orton
用JCMT的外差接收器B3测量了海王星中CO的J = 3-2旋转线。频谱分辨率为1.25 MHz， 25次调谐用于覆盖近20 GHz的频率范围。测量的线形既包含低层大气产生的宽吸收特征，又包含上层平流层的窄发射核心，表明CO摩尔比随高度不均匀，平流层上层的最佳拟合值为2.2−0.4+0.6×10−6，平流层下层和对流层的最佳拟合值为0.6±0.4×10−6。较高的平流层丰度表明CO极有可能有内部和外部的双重来源。
The J = 3–2 rotational line of CO in Neptune has been measured using the heterodyne receiver B3 at the JCMT. The spectral resolution was 1.25 MHz and 25 tunings were used to cover a frequency range of almost 20 GHz. The measured line shape, encompassing both the broad absorption feature arising in the lower atmosphere and a narrow emission core from the upper stratosphere, indicates that the CO mole ratio is not uniform with altitude, with best-fit values of 2.2−0.4+0.6×10−6in the upper stratosphere and 0.6±0.4×10−6in the lower stratosphere and troposphere. The higher stratospheric abundance indicates that a dual, internal and external, origin of CO is most likely.