杨晨义,郭启云,曹晓钟,张武. 2021. 基于新型往返式探空观测的下平流层重力波特征分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.008
基于新型往返式探空观测的下平流层重力波特征分析
Characteristic Analysis of Lower Stratospheric Gravity Wave Based on New Roundtrip Sounding
投稿时间:2020-05-16  修订日期:2020-08-04
DOI:10.11676/qxxb2021.008
中文关键词:  下平流层,重力波,往返式探空资料,下投探空
英文关键词:lower stratosphere, gravity wave, round-trip sounding data, drop sounding
基金项目:科技部重大自然灾害监测预警与防范重点专项(2018YFC1506201、204),国家重点研发计划项目(2016YFC0401003),国家自然科学基金重点项目(41430425)
作者单位E-mail
杨晨义 兰州大学 yangchy14@lzu.edu.cn 
郭启云 中国气象局气象探测中心 feng_cloudy@163.com 
曹晓钟 中国气象局气象探测中心 caoxzh@126.com 
张武 兰州大学 wzhang@lzu.edu.cn 
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中文摘要:
      利用了2018年6月9日到2018年7月10日,安庆、长沙、赣州、南昌、宜昌、武汉6个站点的往返式探空试验数据,提取重力波各项参数,包括重力波能量密度、固有频率、波长以及传播方向;研究分析了六个站点的重力波参数,统计了试验地区的6-7月的重力波特征,并且横向比较了各个站点之间的差异以及上升段与下投段的差异。主要结果如下:1)该区域重力波动能一般分布在0.2 J/m3~1.2 J/m3的范围内,平均值约为0.8 J/m3,势能一般分布在0.03 J/m3~0.5 J/m3的范围内,平均值约为0.2 J/m3。2)垂直波长中90%样本都分布在1km ~2.5 km,超过50%的样本都分布在2 km~2.5 km,平均波长一般为1.8 km左右;水平波长分布范围在40~1500 km,主要在200 km ~800 km,平均值集中在600 km,重力波垂直波长与水平波长的比值很小,在平流层重力波以水平传播为主。3)大部分站点的上升段和下降段结果均存在比较明显的主要传播方向,但主要传播方向特征并不一致,以西北方向传播最多,其次是北向传播。这种新型数据适用于下平流层重力波的观测与分析,下降段资料能起到对于重力波事件的加密观测作用,上升段与下投段所获得的结果存在一定差异,但除水平传播方向外,其余参数差别较小,除能量以外参数的一般是下降段结果偏大。
英文摘要:
      In this paper, the experimental data of the round-trip sounder at Anqing, Changsha, Ganzhou, Nanchang Wuhan and Yichang stations from June 9, 2018 to July 10, 2018 are used to extract the parameters of gravity wave, including the energy density, natural frequency, wavelength and propagation direction of gravity wave. By studying and analyzing the parameters of gravity wave at these five stations, the gravity wave from June to July in the experimental area is counted. Characteristics, and horizontal comparison of the differences between the various sites, as well as the differences between the up and down section. The main results are as follows: 1)The gravitational wave energy in this region is generally distributed in the range of 0.4 J/m3 to 1.2 J/m3, with an average value of about 1 J/m3, and the potential energy is generally distributed in the range of 0.03 J/m3 to 0.5 J/m3, with an average value of about 0.2 J/m3.2)90% of the samples in the vertical wavelength range from 1 km to 2.5 km, and more than 50% of the samples in the range of 2 km to 2.5 km. The average wavelength is about 1.8 km. The horizontal wavelength is mainly distributed in the range of 200 km to 800 km, with an average of about 600 km. The ratio of vertical wavelength to horizontal wavelength of gravity wave is very small, and the gravity wave propagates horizontally in the stratosphere. 3) There are obvious main propagation directions in the ascending and descending sections of most stations, but the characteristics of the main propagation directions are not the same, with the northwest spreading the most, followed by the North spreading. This new data is suitable for the observation and analysis of gravity wave in the lower stratosphere. The data in the descending section can play an important role in the densification observation of gravity wave events. There are some differences between the results obtained in the ascending section and the descending section, but the differences of other parameters are small except for the horizontal propagation direction, and the results in the descending section are generally large except for the energy.
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