摘要
利用位处青藏高原的红原探空站2008年5月垂直高分辨率的无线电探空资料分析了其上空下平流层(19~26km)重力波的波动特性。结果表明:重力波的垂直波长主要集中在2~4km之间,平均值约为2.9km;水平波长主要集中在100~600km之间,平均值约为311km;固有频率主要集中在1.5f~3.5f(f为科氏参数)之间,平均值约为2.5f,相当于固有周期9h左右。重力波能量在垂直方向上主要向上传播,其出现频率达到85%;水平传播方向主要为偏东方向。垂直固有波速主要集中在-0.2~-0.05m/s之间,平均值约为-0.12m/s;水平固有波速主要集中在5~15m/s之间,平均值约为11.3m/s。
Using the high vertical resolution radiosonde data of May 2008 at the Hongyuan meteorological station located in the Tibetan Plateau, the observational characteristics of gravity waves in the lower stratosphere (19 to 26 km) are investigated. The results show that the dominant vertical wavelengths of the gravity waves are 2 to 4 km, with a mean value of 2.9 km; the dominant horizontal wavelengths are 100 to 600 km, with an average value of 311 km; the intrinsic frequency is dominated by 1.5f to 3.5f (Coriolis parameter), with a medium value of 2.5f, corresponding to an intrinsic period of 9 hours. The dominant (85%) wave energy propagation direction is upward; the horizontal propagation direction is mainly eastward. The dominant vertical intrinsic phase velocities range from -0.2 to 0.05 m/s, with an average value of -0.12 m/s; the dominant horizontal intrinsic phase velocities range from 5 to 15 m/s, with a mean value of 11.3 m/s.
出处
《气象科技》
北大核心
2011年第6期768-771,共4页
Meteorological Science and Technology
基金
国家自然科学基金项目(40875035)
中国气象局行业专项(GYHYQX2007-6-20)
中国气象科学研究院基本科研业务费专项(2007Y002)
灾害天气国家重点实验室自主研究专项(2008LASWZ103)资助
关键词
青藏高原
重力波
下平流层
主分量分析方法
Tibetan Plateau gravity wave lower stratosphere principal component analysis