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000002600 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000002600 1001_ $$0P:(DE-Juel1)VDB12001$$aPreusse, P.$$b0$$uFZJ
000002600 245__ $$aTransparency of the atmosphere to short horizontal wavelength gravity waves
000002600 260__ $$aWashington, DC$$bUnion$$c2008
000002600 300__ $$aD24104
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000002600 440_0 $$06393$$aJournal of Geophysical Research D: Atmospheres$$v113$$x0148-0227
000002600 500__ $$aWe thank Jens Oberheide and Raymond Roble for providing the TIME-GCM model output. S. D. Eckermann's work was supported by NASA's Geospace Sciences SR & T Program. We thank two anonymous reviewers for their careful reading of the manuscript and one reviewer for valuable comments and in particular for comments on the short horizontal wavelength GWs.
000002600 520__ $$aWe use theory and global ray modeling to investigate how the potential of gravity waves to transport momentum flux globally from the lower atmosphere into the mesosphere and lower thermosphere (MLT) varies with horizontal wavelength and ground-based phase speed. Ray modeling is performed using the Gravity Wave Regional or Global Ray Tracer (GROGRAT) interfaced to realistic three-dimensional global winds and temperatures from 0 to 100 km altitude, specified by fusing analysis fields at lower altitudes to GCM results higher up. We focus on gravity waves in the short 10- to 50-km horizontal wavelength range that are unresolved by global models and, according to theory, can transport appreciable momentum flux into the MLT. Ray results for different seasons reproduce some of the limits derived from simple wave theory: that horizontal wavelengths shorter than 10 km tend to be removed by vertical reflection or evanescence at the source and slower phase speeds are more prone to critical level removal, leading to a preference for waves with longer horizontal wavelengths and faster ground-based phase speeds to reach the MLT. These findings are compared to the wavelength scales currently resolved by satellite limb and nadir sounders, highlighting wavelength ranges currently measured and those currently unresolved. A road map is developed for how current and future satellite measurements can be combined to measure the full space-time spectrum of gravity waves relevant to eddy flux deposition and momentum forcing of the global MLT. In particular, recommendations for new satellite measurement strategies that fill current measurement gaps are provided.
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000002600 7001_ $$0P:(DE-HGF)0$$aEckermann, S. D.$$b1
000002600 7001_ $$0P:(DE-Juel1)VDB13497$$aErn, M.$$b2$$uFZJ
000002600 773__ $$0PERI:(DE-600)2016800-7 $$a10.1029/2007JD009682$$gVol. 113, p. D24104$$pD24104$$q113<D24104$$tJournal of geophysical research / Atmospheres  $$tJournal of Geophysical Research$$v113$$x0148-0227$$y2008
000002600 8567_ $$uhttp://dx.doi.org/10.1029/2007JD009682
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