Inertial gravity waves observed by a Doppler wind LiDAR and their possible sources
Inertial gravity waves observed by a Doppler wind LiDAR and their possible sources
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DOI：
10.26464/epp2020039
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发表时间：
2020-09
影响因子：
2.9
通讯作者：
X. Xue;Dong-song Sun;H. Xia;X. Dou
中科院分区：
文献类型：
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作者：
X. Xue;Dong-song Sun;H. Xia;X. Dou
本文利用中国西北部德令哈(37.4°N，97.4°E)附近的风场观测资料，研究了平流层重力惯性波的特征。我们关注2013年12月10日至12日，这是一个特别有趣的案例研究。大多数情况下，从激光雷达测量中提取的惯性重力波是稳定的，垂直波长约为9-11公里，水平波长约为800-1000公里。然而，对于本案例研究中的部分观测周期，测速图分析表明，在较低和较高的高度存在不同的惯性重力波传播特征。在平流层中上层(约30-50公里)，波向下传播，特别是在大风期间，波向西北-东南方向传播。而在平流层下部和对流层上部(~10~20公里)，则以向上传播、东北-西南方向的波为主。通过考虑再分析数据和卫星观测，我们确认了在观测期的这段时间内，平流层下部和上部存在不同的波型。合并的数据集表明，在较低和较高高度水平的不同波型很可能与平流层较低和较高急流的存在有关。
In this paper, we use wind observations by a Doppler wind LiDAR near Delingha (37.4°N, 97.4°E), Qinghai, Northwestern China to study the characteristics of inertial gravity waves in the stratosphere. We focus on 10–12 December 2013, a particularly interesting case study. Most of the time, the inertial gravity waves extracted from the LiDAR measurements were stationary with vertical wavelengths of about 9–11 km and horizontal wavelengths of about 800–1000 km. However, for parts of the observational period in this case study, a hodograph analysis indicates that different inertial gravity wave propagation features were present at lower and upper altitudes. In the middle and upper stratosphere (~30–50 km), the waves propagated downward, especially during a period of stronger winds, and to the northwest–southeast. In the lower stratosphere and upper troposphere (~10–20 km), however, waves with upward propagation and northeast–southwest orientation were dominant. By taking into account reanalysis data and satellite observations, we have confirmed the presence of different wave patterns in the lower and upper stratosphere during this part of the observational period. The combined data sets suggest that the different wave patterns at lower and upper height levels are likely to have been associated with the presence of lower and upper stratospheric jet streams.