Characteristic Comparison of Perturbation Fields with Different Methods for Obtaining Atmospheric Gravity Wave Parameters
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Abstract:
Studying the climatic characteristics of gravity wave parameters constitutes an important part of the parameterization of gravity waves in the development of a global atmospheric model. The disturbance fields obtained by using the highresolution radiosonde data are the basic data and important means to obtain the climate characteristics of gravity wave parameters. At present, the 2 to 4 order curve fitting and bandpass filtering methods are used to obtain the disturbance fields of high vertical resolution radiosonde data. However, there are few studies on the differences in the characteristics of disturbance fields resulted from different methods. In the paper, the disturbance fields of the high vertical resolution radiosonde data in Taiyuan (112.55°E, 37.78°N) from 2014 to 2017 are obtained by the 2 to 4 order curve fitting and bandpass filtering methods (0.5 to 5.0 km), subsequently, studied by correlation coefficient, LombScargle, and different interval range occupancy methods. The results show: (1) the disturbance fields from differentorder curve fitting methods show different amplitudes, different trends with height, and weak correlation; (2) the LombScargle analysis shows that the significant vertical wavelengths (passed the 90% confidence test) are contained in the average zonal wind disturbance fields, the average meridional wind disturbance fields and the average temperature disturbance fields from different methods, and there are significant differences; (3) the significant vertical wavelengths are contained in the zonal wind disturbance fields, meridional wind disturbance fields and temperature disturbance fields from different methods, and there are significant differences in their occupancy rate within different intervals.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.