Discovery of a Doppler-limited CO line in the upper mesosphere of Venus - A new dynamical probe
Discovery of a Doppler-limited CO line in the upper mesosphere of Venus - A new dynamical probe
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在金星上层中间层发现多普勒限制的 CO 谱线——一种新的动力学探测器
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
J. Goldstein
中科院分区：
文献类型：
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作者：
D. Buhl;G. Chin;J. Goldstein
金星上层大气中CO的存在是主要大气成分CO{sub 2}光化学作用的结果。1989年1 - 2月在230 GHz观测到CO的J = 1-2跃迁。除了Kakar等人（1976年）首次报道的宽吸收线外，由于上层中层CO的存在，在吸收线的中心有一个窄吸收特征，在那里温度廓线开始随高度呈现日变化。窄特征约为600 kHz宽，主要是多普勒展宽。多普勒核心提供了一种测量金星大气层中这些高度风速的新方法。在测线中心探测到小的多普勒频移，原则上可以用来测量风速，精度为10米/秒。结果目前受到17 kHz不确定性的限制，在所测量的静止频率，对应于风速的系统误差高达22米/秒，并没有实验室测量的压力变化CO CO{sub 2}。参考文献34篇。
The presence of CO in the upper atmosphere of Venus is a consequence of the photochemistry of CO{sub 2}, the dominant atmospheric constituent. In December 1989 the J = 1-2 transition of CO was observed at 230 GHz. In addition to the broad absorption line first reported by Kakar et al. (1976), a narrow absorption feature at the center of the line due to upper mesospheric CO, where the temperature profile starts to exhibit diurnal variation with altitude. The narrow feature is approximately 600 kHz wide and is predominantly Doppler-broadened. The Doppler core provides a new means of measuring wind velocities at these altitudes in the atmosphere of Venus. Detection of small Doppler shifts in the line core can in principle be used to measure winds with an accuracy of 10 m/s. Results are presently limited by the 17 kHz uncertainty in the measured rest frequency, corresponding to a systematic error in wind velocity up to 22 m/s, and the absence of laboratory measurements of the pressure shift in CO by CO{sub 2}. 34 refs.