Reconstruction of internal gravity wave parameters from radio occultation retrievals of vertical temperature profiles in the Earth's atmosphere
Reconstruction of internal gravity wave parameters from radio occultation retrievals of vertical temperature profiles in the Earth's atmosphere
复制标题
通过无线电掩星反演地球大气层垂直温度剖面重建内部重力波参数
DOI：
10.5194/amt-4-2153-2011
复制
发表时间：
2011
影响因子：
3.8
通讯作者：
A. Pavelyev
中科院分区：
文献类型：
--
作者：
V. Gubenko;A. Pavelyev;R. R. Salimzyanov;A. Pavelyev
抽象的。本文提出了一种由单次垂直温度廓线测量重建重力内波参数的新方法。这种方法不需要任何额外的信息不包含在配置文件中，并可用于分析的配置文件所测量的各种技术。对IGW的识别标准进行了阐述和论证。在满足该标准的情况下，分析的温度波动可以被认为是波浪引起的。该方法是基于温度波场的相对振幅阈值的分析和线性IGW饱和理论，其中振幅阈值是由大气中的动力学（剪切）不稳定性过程的限制。当内部重力波的振幅达到剪切不稳定极限时，假设能量以这样的方式耗散，即当波向上传播时，振幅保持在不稳定极限。为了认可的方法，我们已经使用的数据，同时高分辨率的气球测量的温度和风速在地球的平流层在法国的长周期惯性重力波已被检测到。仅用探空仪温度资料，我们就重建了探空仪测定的所有波浪参数，相对误差不超过30%。将该方法应用于无线电掩星（RO）数据，可以识别地球平流层的IGW，并确定关键波参数的大小，如固有频率、风速的垂直和水平扰动幅度、垂直和水平波长、固有垂直和水平相位（和组）速度，动能和势能，波能和水平动量的垂直通量。本文介绍和讨论了由COSMIC和CHAMP GPS掩星温度廓线导出的地球平流层内波研究结果。
Abstract. A new method for the reconstruction of internal gravity wave (IGW) parameters from a single vertical temperature profile measurement in the Earth's atmosphere has been developed. This method does not require any additional information not contained in the profile and may be used for the analysis of profiles measured by various techniques. The criterion for the IGW identification has been formulated and argued. In the case when this criterion is satisfied, then analyzed temperature fluctuations can be considered as wave-induced. The method is based on the analysis of relative amplitude thresholds of the temperature wave field and on the linear IGW saturation theory in which amplitude thresholds are restricted by dynamical (shear) instability processes in the atmosphere. When the amplitude of an internal gravity wave reaches the shear instability limit, energy is assumed to be dissipated in such a way that the amplitude is maintained at the instability limit as the wave propagates upwards. In order to approbate the method we have used data of simultaneous high-resolution balloon measurements of the temperature and wind velocity in the Earth's stratosphere over France where a long-period inertia-gravity wave has been detected. Using the radiosonde temperature data only, we have reconstructed all wave parameters, which were determined by radiosondes, with relative deviations not larger than 30%. An application of the method to the radio occultation (RO) data has given the possibility to identify the IGWs in the Earth's stratosphere and to determine the magnitudes of key wave parameters such as the intrinsic frequency, amplitudes of vertical and horizontal perturbations of the wind velocity, vertical and horizontal wavelengths, intrinsic vertical and horizontal phase (and group) speeds, kinetic and potential energy, vertical fluxes of the wave energy and horizontal momentum. The obtained results of internal wave studies in the Earth's stratosphere deduced from the COSMIC and CHAMP GPS occultation temperature profiles are presented and discussed.