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000057885 0247_ $$2DOI$$a10.1016/j.jastp.2007.07.005
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000057885 084__ $$2WoS$$aGeochemistry & Geophysics
000057885 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000057885 1001_ $$0P:(DE-HGF)0$$aFröhlich, K.$$b0
000057885 245__ $$aThe global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: Attempt and challenges
000057885 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2007
000057885 300__ $$a2238 - 2248
000057885 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000057885 440_0 $$014744$$aJournal of Atmospheric and Solar-Terrestrial Physics$$v69$$x1364-6826
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000057885 520__ $$aFive years of global temperatures retrieved from radio occultations measured by Champ (Challenging Minisatellite Payload) and SAC-C (Satelite de Aplicaciones Cientificas-C) are analyzed for gravity waves (GWs). In order to separate GWs from other atmospheric variations, a high-pass filter was applied on the vertical profile. Resulting temperature fluctuations correspond to vertical wavelengths between 400 in (instrumental resolution) and 10 km (limit of the high-pass filter). The temperature fluctuations can be converted into GW potential energy, but for comparison with parameterization schemes GW momentum flux is required. We therefore used representative values for the vertical and horizontal wavelength to infer GW momentum flux from the GPS measurements. The vertical wavelength value is determined by high-pass filtering, the horizontal wavelength is adopted from a latitude-dependent climatology. The obtained momentum flux distributions agree well, both in global distribution and in absolute values, with simulations using the Warner and McIntyre parameterization (WM) scheme. However, discrepancies are found in the annual cycle. Online simulations, implementing the WM scheme in the mechanistic COMMA-LIM (Cologne Model of the Middle Atmosphere-Leipzig Institute for Meteorology) general circulation model (GCM), do not converge, demonstrating that a good representation of GWs in a GCM requires both a realistic launch distribution and an adequate representation of GW breaking and momentum transfer. (c) 2007 Elsevier Ltd. All rights reserved.
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000057885 65320 $$2Author$$agravity waves
000057885 65320 $$2Author$$amomentum flux
000057885 65320 $$2Author$$aparameterization scheme
000057885 65320 $$2Author$$aGPS
000057885 7001_ $$0P:(DE-HGF)0$$aSchmidt, T.$$b1
000057885 7001_ $$0P:(DE-Juel1)VDB13497$$aErn, M.$$b2$$uFZJ
000057885 7001_ $$0P:(DE-Juel1)VDB12001$$aPreusse, P.$$b3$$uFZJ
000057885 7001_ $$0P:(DE-HGF)0$$ade la Torre, A.$$b4
000057885 7001_ $$0P:(DE-HGF)0$$aWickert, J.$$b5
000057885 7001_ $$0P:(DE-HGF)0$$aJacobi, Ch.$$b6
000057885 773__ $$0PERI:(DE-600)2020910-1$$a10.1016/j.jastp.2007.07.005$$gVol. 69, p. 2238 - 2248$$p2238 - 2248$$q69<2238 - 2248$$tJournal of atmospheric and solar-terrestrial physics$$v69$$x1364-6826$$y2007
000057885 8567_ $$uhttp://dx.doi.org/10.1016/j.jastp.2007.07.005
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000057885 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
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