不同扰动场对大气重力波参数结果影响的初步探讨
投稿时间: 2016-05-04  最后修改时间: 2016-10-30  点此下载全文
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作者单位E-mail
程胡华 太原卫星发射中心气象室 chenghongxi2012@qq.com 
中文摘要:重力波是大气中最基本的动力过程,获取大气重力波参数是大气动力学理论研究的重要内容之一。本文以晋西北地区2013年8月6-8日出现的一次雷阵雨天气过程为例,利用常用的二阶、三阶、四阶曲线拟合和滤波方法获取垂直高分辨率探空资料的扰动场,对这些扰动场提取的大气重力波参数进行对比分析,结果表明:不同扰动场(滤波、二阶、三阶和四阶曲线拟合)对所获取的重力波参数大小及变化趋势存在影响,但对不同重力波参数的影响程度不一样,其中,对波周期、水平波长和垂直波长的大小及变化趋势影响很大,而对波传播方向、波群速及波相速的影响程度则较弱。若考虑6~8日天气现象的大气动力特征,由带通滤波、二阶曲线拟合对应扰动场得到的重力波参数值大小及变化趋势与该天气的动力特征相吻合,其结果可信度最高,而由四阶曲线拟合扰动场得到重力波参数值的可信度最低。
中文关键词:重力波参数  曲线拟合  滤波  雷阵雨  探空资料
 
A Preliminary Investigation of the atmospheric gravity wave parameters obtained by different disturbance fields
Abstract:The gravity wave is the most basic dynamic process in the atmosphere. To obtain the atmospheric gravity wave parameter is one of the important contents of atmospheric dynamic theory. The paper took a thunder storm process occurred on August 6-8 in 2013 in northwestern Shanxi as the example, applied the commonly used second-order, third-order, fourth-order polynomial fitting and filtering method to obtain the disturbance field of vertical sounding data with high resolution, and then conducted comparative analysis on the atmospheric gravity wave parameter obtained by those disturbance fields. The results showed that the different disturbance fields (filtering, second-order, third-order and fourth-order curve fitting) had certain influence on the size and trend of the obtained gravity wave parameter. However, the different gravity wave parameters owned different degrees of influence, of which the disturbance field had great influence on size and trend of wave period, horizontal wavelength and vertical wavelength, but had weak influence on the propagation direction, group velocity and phase velocity. If the atmosphere dynamic characteristics of the weather phenomena on August 6-8 was considered, the gravity wave parameter size and trend obtained by the disturbance fields corresponding to the band-pass filtering and second-order polynomial fitting was consistent with the weather’s dynamic characteristics, whose results owns the highest reliability, while the gravity wave parameter obtained by disturbance fields from the fourth-order polynomial fitting owned the lowest reliability.
keywords:Gravity wave parameters  polynomial fitting  filtering  thunder storm  sounding data
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