%0 Journal Article
%T Analysis of the characteristics of gravity waves during a local rainstorm event in Foshan, China
%A Hengchi LEI
%A Jiangshan ZHU
%A Liang FENG
%A Xiujuan WANG
%A Zhaoming LI
%A Zhongbao JIANG
%J Atmospheric and Oceanic Science Letters
%D 2020
%R https://doi.org/10.1080/16742834.2020.1719567
%X ABSTRACT A detailed analysis of the dynamic frequency spectrum characteristics of gravity waves (GWs) during a local heavy rainfall event on 20¨C21 November 2016 in Foshan, China, is presented. The results of this analysis, which was based on high-precision microbarograph data, indicate that GWs played a key role in generating the rainstorm. The GWs experienced two intermittent periods of amplitude enhancement and period widening. The largest amplitudes of the GWs were 80¨C160 Pa, with a corresponding period range of 140¨C270 min, which were approximately 4 h ahead of the rainstorm. The severe storms appeared to affect the GWs by augmenting the wave amplitudes with center amplitudes of approximately 80¨C100 Pa and periods ranging between 210 and 270 min; in particular, the amplitudes increased to approximately 10 Pa for GWs with shorter periods (less than 36 min). The pre-existing large-amplitude GWs may be precursors to severe storms; that is, these GWs occurred approximately 4 h earlier than the time radars and satellites identified convections. Thus, these results indicate that large-amplitude GWs constitute a possible mechanism for severe-storm warning. Graphical abstrac
%U https://www.tandfonline.com/doi/full/10.1080/16742834.2020.1719567