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题名: Characteristics of mesospheric gravity waves over the southeastern Tibetan Plateau region
作者: Li, Qinzeng; Xu, Jiyao; Liu, Xiao; Yuan, Wei; Chen, Jinsong
作者部门: 空间科学部
通讯作者: Li, QZ (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
关键词: airglow ; gravity wave ; sources
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN号: 2169-9380
出版日期: 2016
卷号: 121, 期号:9, 页码:9204-9221
收录类别: SCI
项目资助者: National Science Foundation of China [41404121, 41331069] ; Specialized Research Fund for State Key Laboratories
英文摘要: The Tibetan Plateau (TP), known as Third Pole of the Earth, has important influences on global climates and local weather. An important objective in present study is to investigate how orographic features of the TP affect the geographical distributions of gravity wave (GW) sources. Three-year OH airglow images (November 2011 to October 2014) from Qujing (25.6 degrees N, 103.7 degrees E) were used to study the characteristics of GWs over the southeastern TP region. Along with the almost concurrent and collocated meteor radar wind measurements and temperature data from SABER/TIMED satellite, the propagation conditions of three types of GWs (freely propagating, ducted, or evanescent) were estimated. Most of GWs exhibited ducted or evanescent characteristics. Almost all GWs propagate southeastward in winter. The GW propagation directions in winter are significantly different from other airglow imager observations at northern middle latitudes. Wind data and convective precipitation fields from the European Centre for Medium-Range Weather Forecasts reanalysis data are used to study the sources of GWs on the edge of the TP. Using backward ray-tracing analysis, we find that most of the mesospheric freely propagating GWs are located in or near the large wind shear intensity region (similar to 10km-similar to 17km) on the southeastern edge of the TP in spring and winter. The averaged value of momentum flux is 11.65.2m(2)/s(2) in winter and 7.53.1m(2)/s(2) in summer. This work will provide valuable information for the GW parameterization schemes in general circulation models in TP region.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5628
Appears in Collections:空间科学部_期刊论文

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