Joint observation of the concentric gravity wave event on the Tibetan Plateau

• 作者: Chang Lai PengWei Li JiYao Xu Wei Yuan Jia Yue Xiao Liu Kogure Masaru LiLi Qian
• 来源期刊: 地球与行星物理（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: RESEARCH ARTICLES
• 页码范围: 219-227
• 页数: 9页
• 语种: 英文
• DOI: 10.26464/epp2022029

摘要

A concentric gravity wave event was captured by a photographer in Nagarzê County (90.28°N, 28.33°E) between 02:00 and 04:00 (local time) on May 11, 2019. This concentric gravity wave event was also observed by the Suomi National Polar-orbiting Partnership satellite and the all-sky airglow imager at Yangbajing station (90.5°E, 30.1°N). The temporal and spatial information on gravity waves from the photographs provided a rare opportunity to study the propagation of gravity waves over the Tibetan Plateau. According to wind and temperature data from the MERRA-2 reanalysis (Modern-Era Retrospective analysis for Research and Applications, Version 2) and empirical models (NRLMSISE-00 [Naval Research Laboratory Mass Spectrometer and Incoherent Scatter Radar Exosphere] and HWM [horizontal wind model]), we inversely derived the propagation trajectory from the observed wave pattern to the source region by using the ray-tracing method. The source of the concentric gravity wave was identified as deep convection in Bangladesh (90.6°E, 25.0°N). The maximum background wind speed in the propagation direction (31.05 m/s) was less than the phase speed of 53 m/s, which is consistent with the wind-filtering theory.