Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions
Neutral temperature and atmospheric water vapour retrieval from spectral fitting of auroral and airglow emissions
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DOI：
10.5194/gi-7-317-2018
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发表时间：
2018-07
期刊：
影响因子：
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通讯作者：
J. Chadney;D. Whiter
中科院分区：
文献类型：
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作者：
J. Chadney;D. Whiter
抽象。我们已经开发了一种光谱拟合方法，在极光出现的时候，可以同时在多个高度检索高层大气参数，使我们能够测量中性温度和水蒸气柱密度。我们使用的方法来分离极光O+和N2在725和740 nm之间的观测，使用位于斯瓦尔巴群岛的高分辨率成像中阶梯光谱仪（HiTIES）的气辉OH排放。在本文中，我们描述了我们的新方法，并显示使用合成光谱的Monte Carlo模拟的结果，证明了光谱拟合方法的有效性，并提供了每个大气参数的检索上的不确定性的指示。我们表明，该方法允许检索OH温度的不确定性为6%时，N2排放污染是小的。当N2排放强度较高时，N2温度反演的不确定度可达3%~ 5%。我们可以确定在732和733 nm处的O+双峰之间的强度比（这是温度的函数），不确定度为5%。
Abstract. We have developed a spectral fitting method to retrieve upper atmospheric parameters at multiple altitudes simultaneously during times of aurora, allowing us to measure neutral temperatures and column densities of water vapour. We use the method to separate airglow OH emissions from auroral O+ and N2 in observations between 725 and 740 nm using the High Throughput Imaging Echelle Spectrograph (HiTIES) located on Svalbard. In this paper, we describe our new method and show the results of Monte Carlo simulations using synthetic spectra which demonstrate the validity of the spectral fitting method and provide an indication of uncertainties on the retrieval of each atmospheric parameter. We show that the method allows for the retrieval of OH temperatures with an uncertainty of 6 % when contamination by N2 emission is small. N2 temperatures can be retrieved with uncertainties down to 3 %–5 % when N2 emission intensity is high. We can determine the intensity ratio between the O+ doublets at 732 and 733 nm (which is a function of temperature) with an uncertainty of 5 %.