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Spectral analysis of gravity wave activity in SABER temperature data
Author(s) -
Krebsbach Marc,
Preusse Peter
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl028040
Subject(s) - stratosphere , tropopause , quasi biennial oscillation , atmospheric sciences , amplitude , gravity wave , thermosphere , geology , polar vortex , climatology , latitude , mesosphere , wavelength , depth sounding , middle latitudes , maxima , environmental science , gravitational wave , ionosphere , physics , geodesy , geophysics , astrophysics , oceanography , optoelectronics , quantum mechanics , art , performance art , art history
Since January 2002, the SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) instrument has performed continuous measurements from near the tropopause into the thermosphere. For the time period 29 January 2002–31 January 2006, we spectrally analyzed time series of weekly zonal root mean square gravity wave (GW) amplitudes for systematic intra‐annual, annual and inter‐annual GW activity. GWs considered have horizontal wavelengths between 100 km and zonal wave number 6 and vertical wavelengths between 5–30 km. Height‐latitude cross sections of spectral amplitudes and phases between 20–100 km and 55°S–55°N show several relevant oscillations. A strong semiannual variation is evident in the high‐latitude upper stratosphere/mesosphere. Annual components reveal two isolated maxima at mid‐latitudes in both hemispheres, associated with the winter polar vortices, and summertime maxima in the subtropics. Biennial amplitudes in the equatorial stratosphere coincide with the descending westerly shear phase and can be attributed to the quasi‐biennial oscillation.