Horizontal wavenumber spectra of MLS radiance fluctuations

Details Horizontal wavenumber spectra of MLS radiance fluctuations Horizontal wavenumber spectra of MLS radiance fluctuations

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63.1465w&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 14, p. 1465-1477.

Physics

7

Scientific paper

Radiance fluctuations from Upper Atmosphere Research Satellite Microwave Limb Sounder (UARS MLS) reflect atmospheric temperature oscillations of short (>=30km) horizontal and long (>10km) vertical wavelengths at 38-80km altitudes. These radiance fluctuations often show wave-like structures with clear phase coherence among different altitudes. This paper applies a spectral analysis to MLS limb-tracking radiances and obtains a seasonal climatology of horizontal wavenumber spectra at scales of 50-800km for 6 altitudes (38, 43, 48, 53, 61 and 80km) and 8 latitudes (from /70°S to /70°N). Most of the power spectra exhibit a slope close to /-2 but some can be as steep as /-3 in wave active regions. The spectral power density is strongly season-and-latitude dependent in the stratosphere, which is thought largely due to the modulation of the background winds on the vertical wavenumber spectrum. The spectral amplitudes grow exponentially with height between 38 and 50km but the growth rate becomes small or close to zero near and above 50km. The growth rates at 38-53km altitudes are scale-dependent showing less efficient vertical propagation for larger-scale waves. The near-zero growth in the lower mesosphere is thought mainly due to wave saturation/breaking at these altitudes.

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