Influence of topography on the fine structures of stratospheric gravity waves:An analysis using COSMIC-2 temperature data  

作　　者：JiaRui Wei Xiao Liu JiYao Xu QinZeng Li Hong Gao 

机构地区：[1]State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Institute of Electromagnetic Wave,School of Physics,Henan Normal University,Xinxiang Henan 453000,China

出　　处：《Earth and Planetary Physics》2024年第3期497-513,共17页地球与行星物理（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.41831073,42174196,and 42374205);the Project of Stable Support for Youth Team in Basic Research Field,Chinese Academy of Sciences(CAS;Grant No.YSBR-018);the Informatization Plan of CAS(Grant No.CAS-WX2021PY-0101);the Youth Cross Team Scientific Research project of the Chinese Academy of Sciences(Grant No.JCTD-2021-10);the Open Research Project of Large Research Infrastructures of CAS titled“Study on the Interaction Between Low-/Mid-Latitude Atmosphere and Ionosphere Based on the Chinese Meridian Project.”;This work was also supported in part by the Specialized Research Fund and the Open Research Program of the State Key Laboratory of Space Weather.

摘　　要：We derive the potential energy of gravity waves(GWs)in the upper troposphere and stratosphere at 45°S-45°N from December 2019 to November 2022 by using temperature profiles retrieved from the Constellation Observing System for Meteorology,Ionosphere,and Climate-2(COSMIC-2)satellite.Owing to the dense sampling of COSMIC-2,in addition to the strong peaks of gravity wave potential energy(GWPE)above the Andes and Tibetan Plateau,we found weak peaks above the Rocky,Atlas,Caucasus,and Tianshan Mountains.The land-sea contrast is responsible for the longitudinal variations of the GWPE in the lower and upper stratosphere.At 40°N/S,the peaks were mainly above the topographic regions during the winter.At 20°N/S,the peaks were a slight distance away from the topographic regions and might be the combined effect of nontopographic GWs and mountain waves.Near the Equator,the peaks were mainly above the regions with the lowest sea level altitude and may have resulted from convection.Our results indicate that even above the local regions with lower sea level altitudes compared with the Andes and Tibetan Plateau,the GWPE also exhibits fine structures in geographic distributions.We found that dissipation layers above the tropopause jet provide the body force to generate secondary waves in the upper stratosphere,especially during the winter months of each hemisphere and at latitudes of greater than 20°N/S.

关 键 词：TOPOGRAPHY fine structures stratospheric gravity waves Constellation Observing System for Meteorology Ionosphere and Climate-2(COSMIC-2) dissipation layers 

分 类 号：P421.32[天文地球—大气科学及气象学]