Investigation of a mesospheric bore event over northern China
Investigation of a mesospheric bore event over northern China
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DOI：
10.5194/angeo-31-409-2013
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发表时间：
2013-03
影响因子：
1.9
通讯作者：
Qinzeng Li;Jiyao Xu;J. Yue;Xiao Liu;W. Yuan;B. Ning;S. Guan;J. Younger
中科院分区：
文献类型：
--
作者：
Qinzeng Li;Jiyao Xu;J. Yue;Xiao Liu;W. Yuan;B. Ning;S. Guan;J. Younger
抽象。2011年1月8-9日晚，在中国北方兴隆（40.2° N，117.4° E）利用OH全天空气辉成像仪（ASAI）观测到了一次中层孔事件。同时观测多普勒流星雷达，宽带钠激光雷达，和TIMED/SABER OH强度和温度测量被用来调查的特点和环境的孔传播和可能的关系与钠密度扰动。这股涌浪从东北向西南传播，把天空分成明亮和黑暗的两半。计算表明，该孔的平均相速度为68 m s−1。在钻孔之后的波峰具有约22公里的水平波长。这些参数与Dewan和Picard提出的水跃理论以及以前的钻孔报告一致。同时利用十三陵（40.3° N，116.2° E）多普勒流星雷达的风测量和TIMED卫星上SABER的温度数据来表征涌浪的传播环境。结果表明，在OH层附近存在着一个热多普勒波导，它支持着炮膛的水平传播。在延庆（40.4° N，116.0° E）的Na激光雷达同步观测表明，在中层孔事件通过期间，Na浓度有一个向下的位移。
Abstract. A mesospheric bore event was observed using an OH all-sky airglow imager (ASAI) at Xinglong (40.2° N, 117.4° E), in northern China, on the night of 8–9 January 2011. Simultaneous observations by a Doppler meteor radar, a broadband sodium lidar, and TIMED/SABER OH intensity and temperature measurements are used to investigate the characteristics and environment of the bore propagation and the possible relations with the Na density perturbations. The bore propagated from northeast to southwest and divided the sky into bright and dark halves. The calculations show that the bore has an average phase velocity of 68 m s−1. The crests following the bore have a horizontal wavelength of ~ 22 km. These parameters are consistent with the hydraulic jump theory proposed by Dewan and Picard, as well as the previous bore reports. Simultaneous wind measurements from the Doppler meteor radar at Shisanling (40.3° N, 116.2° E) and temperature data from SABER on board the TIMED satellite are used to characterize the propagating environment of the bore. The result shows that a thermal-Doppler duct exists near the OH layer that supports the horizontal propagation of the bore. Simultaneous Na lidar observations at Yanqing (40.4° N, 116.0° E) suggest that there is a downward displacement of Na density during the passage of the mesospheric bore event.