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Type: Journal article
Title: Wavelet analysis of stratosphere gravity wave packets over Macquarie Island 1. Wave parameters
Author: Zink, F.
Vincent, R.
Citation: Journal of Geophysical Research, 2001; 106(D10):10275-10288
Publisher: Amer Geophysical Union
Issue Date: 2001
ISSN: 0148-0227
Statement of
Florian Zink and Robert A. Vincent
Abstract: We describe a technique to detect gravity wave packets in high-resolution radiosonde soundings of horizontal wind and temperature. The vertical profiles of meridional and zonal wind speeds are transformed using the Morlet wavelet, and regions of high wind variance in height-wavenumber space are identified as gravity wave packets. Application of the Stokes parameter analysis to horizontal wind and temperature profiles of the reconstructed wave packets yields the wave parameters. The technique was applied to twice-daily radiosonde launches at Macquarie Island (55°S, 159°E) between 1993 and 1995. A strong seasonal cycle in the total wave variance was found, with a maximum in winter. The amount of wave energy propagating downward from the upper stratosphere also maximized in winter. Waves propagated predominately toward the southwest in winter, but in summer propagation directions were approximately isotropic. The intrinsic frequencies were close to the inertial frequency, and the waves had inferred horizontal wavelengths of several hundred kilometers.
Rights: Copyright 2001 by the American Geophysical Union
RMID: 0020010428
DOI: 10.1029/2000JD900847
Appears in Collections:Physics publications

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