Open AccessA new method of obtaining perturbation vertical profiles in estimating the atmosphere gravity wave parameters
Author(s) -
Cheng Huhua,
Zhong Zhong,
Cen Jin,
Deng Shao-Ge
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.189201
Subject(s) - morlet wavelet , wavelet , perturbation (astronomy) , gravity wave , fourier transform , physics , gravitational wave , mathematical analysis , computational physics , mechanics , mathematics , wavelet transform , computer science , discrete wavelet transform , astrophysics , quantum mechanics , artificial intelligence
The gravity wave is the fundamental dynamic process in the atmosphere, and one of the important theoretical studies of atmosphere dynamics is to estimate the gravity wave parameters. Due to the inherent deficiency of the curve fitting method for the vertical perturbation profile (VPP), a new method is proposed in obtaining the profile for estimating the reasonable gravity wave parameters. Based on the features of cone of influence in wavelet transformation and its maximum value, which is considered as the critical value for background profile and perturbation profile, the VPP is obtained with a 10th-order Butter Worth highpass filter for the signal with the magnitude less than the critical value. With the Morlet wavelet and Fourier power spectrum analyses for the numerically simulated zonal wind and meridional wind, it is found that there are neither distinct background signals nor false signal including in the VPPs, which overcomes the deficiency of curve fitting method. Therefore, the proposed method is excellent compared with the widely used curve fitting method in obtaining the VPPs, and the reasonable atmosphere gravity wave parameters could be estimated with the new method.