2008年夏季昆明上空下平流层重力波统计特性-中国农学通报.PDF

中国农学通报 2011,27(6):308-312 Chinese Agricultural Science Bulletin 2008年夏季昆明上空下平流层重力波统计特性 张灵杰1,2 1 2 （中国气象科学研究院，北京100081；温州市气象局，浙江温州325027） 摘 要：利用昆明探空站2008 年夏季（6—8 月）垂直高分辨率的L 波段探空资料，分析了昆明上空下平流 层（21~28 km ）惯性重力波的统计特性。分析结果表明：垂直波长主要集中在3.5~4 km 之间，平均值约 为3.53 km ；水平波长主要集中在250~ 1250 km 之间，平均值约为714 km ；平均水平波长与平均垂直波长 之比约为200:1。固有频率主要集中在1f~2.5f 之间，平均值约为1.7f ，相当于固有周期17 h 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86% ；水平传播方向主要为偏东、偏北、西南、偏南 和东南5 个方向。垂直固有波速主要集中在-0.1~0 m/s 之间，平均值约为-0.06 m/s ；水平固有波速主要集 中在10~20 m/s 之间，平均值约为14.5 m/s 。 关键词：惯性重力波；下平流层；统计特性 中图分类号：P445 文献标志码：A 论文编号：2010-1691 StatisticsofGravityWavesintheLowerStratosphereoverKunmingduringSummer2008 Zhang Lingjie1,2 1 ( ChineseAcademyofMeteorologicalSciences, Beijing 100081; 2 WenzhouMeteorologicalBureau, Wenzhou 325027) Abstract: The statistical characteristics of inertia gravity waves in the lower stratosphere (21-28 km) over Kunming were studied based on the high vertical resolution L-band radiosonde data in the summer (June to August) of 2008 from Kunming sounding station. The results showed that: The vertical wavelengths are mainly in the range of 3.5-4 km, with an average of about 3.53 km. The horizontal wavelengths were mainly distributed between 250-1250 km, with a mean value of about 714 km. The ratio of the mean horizontal to vertical wavelength was about 200:1. The intrinsic frequency was mainly concentrated in 1f-2.5f, with an average of about 1.7f, equivalent to an intrinsic period of 17 hours