| 北京地区上空OH转动温度的季节性变化 |
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| 引用本文： | 刘伟军,徐寄遥,袁韡.北京地区上空OH转动温度的季节性变化[J].地球物理学报,2015,58(5):1467-1474. |
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| 作者姓名： | 刘伟军 徐寄遥 袁韡 |
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| 作者单位： | 1. 中国科学院空间科学与应用研究中心, 北京 100190;
2. 中国科学院大学, 北京 100049 |
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| 基金项目： | 国家自然科学基金(41229001,41331069),中国科学院重点部署项目(KZZD-EW-01-2),国家重点基础研究专项经费资助项目(2011CB811405),空间天气学国家重点实验室专项基金项目资助. |
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| 摘 要： | 在北京东北方向的兴隆天文台,自主搭建的大气辐射观测仪器对OH夜气辉从2011年12月开始进行观测.利用高分辨率的OH(8-3)带的振转光谱计算了转动温度,并与TIMED/SABER探测的温度进行了比较.观测表明,两年(2012—2013)的OH(8-3)带转动温度平均值为203.0±11.2K,有明显的季节变化,冬季高,夏季低,温差可达60K.与SABER观测温度的季节变化一致.对日平均的转动温度进行年振荡和半年振荡分量的拟合分析表明,年振荡强度(10.8K)远大于半年振荡(2.7K).研究还发现,不同夜晚转动温度变化形态差别很大,既有很强的潮汐控制的波动,又有相对短周期的波动.
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| 关 键 词： | OH气辉 转动温度 季节变化 年变化 |
| 收稿时间： | 2014-09-25 |
Seasonal variation of OH rotational temperature measured over Beijing,China |
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| LIU Wei-Jun,XU Ji-Yao,YUAN Wei.Seasonal variation of OH rotational temperature measured over Beijing,China[J].Chinese Journal of Geophysics,2015,58(5):1467-1474. |
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| Authors: | LIU Wei-Jun XU Ji-Yao YUAN Wei |
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| Institution: | 1. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | OH airglow emissions are generated in the mesopause and low thermosphere (MLT) region in a layer centered near 87 km. The OH rotational temperature is a good proxy for the kinetic temperature. So the rotational temperatures derived from ground-based observations of OH airglow emissions are used to investigate the temperature structure in the MLT.The OH airglow emission spectra were observed by the ground-based spectrometer from December 2011 to December 2013. The OH(8-3) band is used to calculate rotational temperature. The temperatures from SABER are weighted vertically by the weighting functions from its OH-A channel volume emission rates. Firstly, the rotational temperature is compared with the SABER. Secondly, the daily mean temperatures are fitted by the harmonic waves, and the temporal variation features during nights are analyzed.The comparison between OH rotational temperature and SABER shows that the mean rotational temperature of OH(8-3) band is 203.0±11.2 K with 5.5 K warmer than SABER's. Both have obviously identical seasonal variations and the temperature variation of winter to summer can reach 60 K. The annual and semiannual components are the two most significant variations, and the annual amplitude of 10.8 K is greater than semiannual amplitude of 2.7 K. Their phases are respectively in December and March. It is shown that there are multiple temporal rotational variations during night, such as oscillations controlled by tides and short-period waves.The OH rotational temperature is a good proxy for the kinetic temperature in the MLT region. There are significant annual and semiannual variations in this region, and the temperatures during night have various temporal features. It is concluded that the temporal variations of ground-based rotational temperatures from OH(8-3) band are well correlated with the SABER temperatures. They have the same seasonal variations and the annual and semiannual oscillations are the two strongest components. The nocturnal rotational temperatures have multiple temporal features controlled by the various oscillations. |
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| Keywords: | Hydroxyl airglow Rotational temperature Seasonal variation Annual variation |
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