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(19～26 km)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2～4 km之间,平均值约为2.9 km；水平波长主要集中在100～600 km之间,平均值约为311 km;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～-0.05 m/s之间,平均值约为-0.12 m/s;水平固有波速主要集中在5～15 m/s之间,平均值约为11.3 m/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. 5/ to 3.5/ (Coriolis parameter), with a medium value of 2.5/, 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.
展开▼
