Investigation of gravity wave activity based on operational radiosonde data from 13 years (1997-2009): Climatology and possible induced variability
Investigation of gravity wave activity based on operational radiosonde data from 13 years (1997-2009): Climatology and possible induced variability
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DOI：
10.1016/j.jastp.2016.01.014
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发表时间：
2016-03
影响因子：
1.9
通讯作者：
R. Kramer;S. Wüst;M. Bittner
中科院分区：
文献类型：
--
作者：
R. Kramer;S. Wüst;M. Bittner
大气重力波是大气动力学的重要组成部分。本文介绍了对布拉格（50.01°N，14.27°E）13年的常规无线电探空资料的分析，这些资料具有时间上高分辨率的温度、气压和风的测量结果，目的是推导平流层下部重力波活动的气候学。确定了一个年周期，冬季最大，夏季最小。重力波活动在冬季是夏季的两倍。利用小波分析研究了冬季周期。水平动量垂直通量和气压方差时间序列具有相似的周期性。这些特征可以归因于行星波。在分析个别年份时，重力波活动和水平动量垂直通量的极大值往往与地面气压的极小值同时出现。因此，我们推测，至少部分的重力波活动的年际变化可能是由于气旋。
Atmospheric gravity waves (GWs) are important for the dynamics of the atmosphere. The analysis of 13 years of routine radiosonde data from Prague (50.01°N, 14.27°E) with temporal highly resolved temperature, pressure and wind measurements is presented in order to derive a climatology of gravity wave activity in the lower stratosphere. An annual cycle with a maximum during winter and a minimum during summer is identified. Gravity wave activity is twice as high during winter as during summer. Winter periods are investigated by wavelet analysis. They show similar periods in vertical flux of horizontal momentum and pressure variance time series. These features may be attributed to planetary waves. When analyzing individual years, maxima of gravity wave activity and vertical flux of horizontal momentum often appears together with minima in surface pressure. We speculate therefore that at least parts of the interannual variations of gravity wave activity may due to cyclones.