Characteristics of mesospheric gravity waves over the southeastern Tibetan Plateau region
Characteristics of mesospheric gravity waves over the southeastern Tibetan Plateau region
复制标题
青藏高原东南部地区中层重力波特征
DOI：
10.1002/2016ja022823
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Chen Jinsong
中科院分区：
文献类型：
--
作者：
Li Qinzeng;Xu Jiyao;Liu Xiao;Yuan Wei;Chen Jinsong
青藏高原被誉为地球的“第三极”，对全球气候和局地天气有着重要的影响。本文的一个重要目的是研究青藏高原地形特征对重力波源地理分布的影响。利用曲靖（25.6°N，103.7°E）2011年11月至2014年10月的OH气辉影像，研究了青藏高原东南部地区大气环流特征。沿着SABER/TIMED卫星的流星雷达、风场和温度资料，估算了自由传播、管道传播和渐逝传播三种类型的全球Ws的传播条件。大部分的GWs表现出波导或瞬逝特性。在冬季，几乎所有的GWs都向东南方向传播。冬季GW传播方向与北方中纬度地区其他气辉成像仪观测结果存在显着差异。使用欧洲中期天气预报中心的风数据和对流降水场。天气预报再分析数据来研究TP边缘的GW来源。利用后向射线追踪分析发现，春季和冬季，中间层自由传播的全球Ws大多位于TP东南边缘的大风切变强度区（~10 km-~17 km）或附近。冬季动量通量平均值为11.6 ± 5.2m2/s ~ 2，夏季为7.5 ± 3.1m2/s ~ 2。This.work models.in将为TP地区的GW参数化计划提供有价值的信息。
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°N, 103.7°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 (~10 km–~17 km) on the southeastern edge of the TP in spring and.winter. The averaged value of momentum flux is 11.6 ± 5.2m2/s2 in winter and 7.5 ± 3.1m2/s2 in summer. This.work will provide valuable information for the GW parameterization schemes in general circulation models.in TP region.