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Ann. Geophys., 24, 1801-1808, 2006
www.ann-geophys.net/24/1801/2006/
© European Geosciences Union 2006
Spectral analysis of 10-m resolution temperature profiles from balloon soundings over Beijing
Y. Wu1,2, J. Xu1, W. Yuan1, H. Chen3, and J. Bian3
1State Key Laboratory for Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, P.O. Box 8701, Beijing 100080, China
2School of Electronic Information, Wuhan University, China
3LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Abstract. Vertical temperature profiles with a height resolution of 10 m have been
measured in the troposphere and lower stratosphere during March and April
2003 over the Beijing Meteorological Observatory. This resolution allows us
to study temperature spectra up to higher wave numbers than many published
papers. Our purposes in this study are to examine the spectral character of
normalized temperature fluctuations in the 2.90–8.01 km (troposphere) and
14.65–19.76 km (lower stratosphere) altitude ranges and to compare them
with model spectra. Vertical wave number spectra of six temperature profiles
are presented. Results indicate that mean spectral slopes are about −1.9 in
the troposphere and −2.2 in the lower stratosphere, which is believed to be
the shallowest slopes ever measured by balloon-borne radiosonde soundings.
Mean spectral amplitudes at m=1/(100 m) are about 17 times larger in the troposphere
and 4 times larger in the lower stratosphere than the predicted saturated
spectral amplitudes. These results show that the observed temperature
spectra do not obey current gravity wave saturation models, the "universal"
atmospheric spectrum model, or the wind-shifting model, in both slope and
amplitude.
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