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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (6): 308-312.

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

2008年夏季昆明上空下平流层重力波统计特性

张灵杰   

  • 收稿日期:2010-05-31 修回日期:2010-12-06 出版日期:2011-03-20 发布日期:2011-03-20

Statistics of gravity waves in the lower stratosphere over Kunming during summer 2008

  • Received:2010-05-31 Revised:2010-12-06 Online:2011-03-20 Published:2011-03-20

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摘要：

利用昆明探空站2008年夏季（6月至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：1）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。2）固有频率主要集中在1 ～2.5 之间，平均值约为1.7 ，相当于固有周期17 h左右。3）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。4）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: 饲草高粱, 饲草高粱, 杂交种, 综合评价

Abstract:

Abstract: The statistical characteristics of inertia gravity waves in the lower stratosphere (21～28 km) over Kunming are 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 show that: 1) The vertical wavelengths are mainly in the range of 3.5～4 km, with an average of about 3.53 km. The horizontal wavelengths are mainly distributed between 250～1250 km, with a mean value of about 714 km. The ratio of the mean horizontal to vertical wavelength is about 200:1. 2) The intrinsic frequency is mainly concentrated in 1 ～2.5 , with an average of about 1.7 , equivalent to an intrinsic period of 17 hours or so. 3) The gravity wave energies are mostly propagating upward in the vertical direction with an occurrence of 86 %. The mean horizontal propagation directions of the gravity waves are mainly eastward, northward, southwestward, southward, and southeastward. 4) The vertical intrinsic phase speed is dominated by -0.1～0 m/s, with a mean value of about -0.06 m/s. The horizontal intrinsic phase speed mainly ranges from 10～20 m/s, with a mean value of about 14.5 m/s.

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