基于中国东港台站的OH气辉成像观测数据对重力波波源的事件分析

利用东港（40°N，124°E）台站于2013年9月15—16日的OH气辉成像观测数据报告了两个重力波事件（1和2）.同时，结合北京十三陵（40.3°N，116.2°E）台站的多普勒流星雷达风场数据和位于39.4°N，130.6°E位置处的SABER/TIMED卫星的温度参数分析发现，观测的两个重力波事件于2013年9月15—16日02∶00—03∶00 LT时间段，和70~110 km高度是自由传播的.利用反射线追踪方法分析表明，重力波事件1和事件2分别产生于（39.3°N，117.2°E）和（47.1°N，121.3°E）.且事件1的波源位置与对流活动和大气向上向下运动过程中产生的不稳定性吻合较好.然而，通过ECMWF再分析资料和MTSAT卫星观测数据分析表明，事件2可能由对流活动或大气向上运动过程中可能产生的不稳定性导致.利用MERRA自地面到约70 km高度的风场数据分析表明，观测的重力波事件1和事件2的水平相速度分别是83.5 m·s^-1（事件1）和80.1 m·s^-1（事件2），均大于低层-中层大气风速-10~45 m·s^-1.因此，观测的两个重力波事件是可能从低层大气传播到中层-低热层大气的.

A study of wave sources of gravity wave events observer by OH airglow imager located at Donggang station

The paper reports two gravity wave events (event 1 and event 2) observed by OH all-sky airglow imager at Donggang (40°N,124°E) station, on the night of 15-16 September, 2013. The two events are free propagation at time period between 02 LT and 03 LT in the altitude between 70 km and 110 km, by using horizontal wind data sets from the Doppler meteor radar located at Shisanling (40.3°N,116.2°E) and temperature parameters from SABER/TIMED satellite located at 39.4°N, 130.6°E. Then, a method of reverse ray tracing was used to study the source regions of these two gravity wave events. The results indicate that the locations of the two events are at (39.3°N, 117.2°E), and (47.1°N, 121.3°E), respectively. The wave source location of event 1 is highly related with intensity convective activity from the infrared cloud images by the Multi-function Transport Satellite. However, event 2 could be caused by the dynamic instability due to vertical motion of air masses from Omega (Pa/s) data observed by the European Center for Medium-Range Weather Forecasts, or convective activity from the infrared cloud images from Multi-function Transport Satellite. In addition, the two events are probably propagated to MLT region from lower source locations, because the observed phase speeds of 83.5 m·s^-1 (event 1) and 80.1 m·s^-1 (event 2) of these two events are faster than zonal wind velocity (-10~45 m·s^-1) obtained from the Modern Era Retrospective-analysis for Research and Applications below 70 km altitudes.