摘要
利用美国阿拉斯加州Nome Ap站点(64.5°N,165.43°E)无线电探空仪约8年的无线电探空观测数据,分析了高纬度地区低平流层惯性重力波的特征。基于矢端曲线法以及Lomb-Scargle谱分析法,从纬向风、经向风和温度廓线中提取了低平流层惯性重力波,统计分析了惯性重力波的波参数及其季节变化。统计研究发现,在春、秋、冬季,惯性重力波向西传播占主导地位,而在夏季,向东传播略显优势,这是由于背景风滤波效应导致惯性重力波传播方向的差异性。在所有月份中向上传播的惯性重力波均占绝对优势,冬季向下传播的惯性重力波明显增加,这是因为冬季强烈极涡活动激发出向上和向下传播的惯性重力波。多年平均的纬向动量有一个较大的净垂直通量(-0.30 mPa),表明高纬地区重力波的活动会对极区平流层涡旋有一个拖曳效应。
Using radiosonde observation data from the Nome Ap station(64.5°N,165.43°E)in Alaska for about 8 years,the characteristics of inertial gravity waves in the low stratosphere over high latitudes were analyzed.Based on the hodograph technique and Lomb-Scargle spectrum analysis,the inertial gravity waves in the low stratosphere were extracted from the zonal wind,meridional wind and temperature profiles,and the wave parameters and their seasonal changes were statistically analyzed.The statistical study indicates that in spring,autumn and winter,the westward propagating inertial gravity waves are predominant,while in summer,the eastward propagating waves are slightly dominant.The difference in propagation direction results from the filtering effects of the background wind.The upward propagating inertial gravity waves are absolutely dominant in all months,and the downward propagating gravity wave obviously increases during winter.This is because the intense polar vortex activity in winter excites the upward and downward propagating inertial gravity waves.The average latitudinal momentum for many years has a large net vertical flux(-0.30 mPa),indicating that gravity wave activity at high latitudes has a drag effect on the polar stratospheric vortex.
作者
宋杨力子
黄开明
SONG Yanglizi;HUANG Kaiming(School of Electronic Information,Wuhan University,Wuhan 430072,Hubei,China)
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2020年第6期541-551,共11页
Journal of Wuhan University:Natural Science Edition
基金
自然科学基金(2005ABA098)。
