COSMIC GPS observations of topographic gravity waves in the stratosphere around the Tibetan Plateau
COSMIC GPS observations of topographic gravity waves in the stratosphere around the Tibetan Plateau
复制标题
DOI：
10.1007/s11430-016-0065-6
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
X. Zeng;X. Xue;X. Dou;Chen Liang;Mingjiao Jia
中科院分区：
文献类型：
--
作者：
X. Zeng;X. Xue;X. Dou;Chen Liang;Mingjiao Jia
利用气象、电离层和气候星座观测系统（COSMIC）全球定位系统（GPS）卫星星座提供的温度剖面来研究青藏高原（TP）周围平流层（18-30公里）的重力波（GW）势能八年系列（2007年至2015年）。我们发现，随着高度的增加，平流层中对流引起的引力波势能（Ep）值减小。受地形刺激的引力波的重要性在该区域得到增强。在被认为缺乏强烈的地形重力波活动的青藏高原，在所有研究年份的春季和冬季都存在明显的活动。从青藏高原纬度带来看，引力波势能分布与当地地形高程高度一致。地形引力波的活动在向上传播到零风速区域时会被强烈过滤。分析表明，青藏高原存在明显的地形重力波激发，并向上传播到平流层上层，受风的影响较大。
Temperature profiles provided by the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) global positioning system (GPS) satellite constellation were used to study an eight-year series (2007 to 2015) of gravity wave (GW) potential energy in the stratosphere (18–30 km) around the Tibetan Plateau (TP). We found that with increasing altitude, the GW potential energy (Ep) values in the stratosphere caused by convection decreases. The importance of GWs that are stimulated by topography is enhanced in this area. In the TP, which was considered to lack strong topographical GW activity, clear activity existed in the spring and winter of all studied years. Based on the latitudinal zone of the TP, the distribution of GW potential energy is highly consistent with the elevation of the local topography. The activities of topographical GWs are strongly filtered as they propagate upward to the area of zero speed wind. The analysis indicates that in the TP, clear orographic GW excitation exists and propagates upward to the upper stratosphere, where it is greatly influenced by the wind.