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Ann. Geophys., 23, 659-663, 2005
www.ann-geophys.net/23/659/2005/
© European Geosciences Union 2005
Wavelet transforms of meteorological parameters and gravity waves
Z. Can1, Z. Aslan2, O. Oguz2, and A. H. Siddiqi3
1Yildiz Technical University, Faculty of Science and Letters, Dept. of Physics, Istanbul, Turkey
2Faculty of Engineering and Design, Istanbul Commerce University, Istanbul, Turkey
3King Fahd University of Petroleum and Minerals, Department of Mathematical Sciences, Dhahran, Saudi Arabia
Abstract. The main purpose of this paper is to analyze some characteristics
of gravity waves (GWs), and seasonal variations of atmospheric waves over
Istanbul by using wavelet techniques. Daily radiosonda data of Istanbul in
the troposphere and lower stratosphere (1000hPa-30hPa) between 1993 and 1997 have
been considered. Wavelet analysis based on a computer simulation of data is generally
close to the real data when Daubechies wavelet series are used. Daily,
monthly, seasonal and annual variations of pressure heights, air temperature
and deviations from mean values have been analyzed. Variations show the
effects of gravity waves for different pressure levels in the troposphere. These
waves lead to the meso-scale wave-form structures in spring, autumn and
winter. As a result of this study, wavelet series and transforms for data
construction, definition of some discontinuities and the local effects on the signal
have been compared with the results of previous studies. The most similar
structure between temperature, turbulence parameters and geo-potential
height deviations has been defined at the 500-hPa pressure level.
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