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Christopher G. Kruse, Ronald B. Smith, and Stephen D. Eckermann

and high-resolution modeling. Acknowledgments This work was supported by the National Science Foundation (NSF-AGS-1338655) and the Chief of Naval Research (PE-61153N). High-performance computing was performed on the Yellowstone supercomputer (ark:/85065/d7wd3xhc) with support provided by NCAR’s Computational and Information Systems Laboratory, sponsored by the National Science Foundation. We would like to acknowledge Andreas Dörnbrack for providing the ECMWF analyses, Johannes Wagner for

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Stephen D. Eckermann, Dave Broutman, Jun Ma, James D. Doyle, Pierre-Dominique Pautet, Michael J. Taylor, Katrina Bossert, Bifford P. Williams, David C. Fritts, and Ronald B. Smith

width of the airglow emission profile I ( z ). Since I ( z ) extends to altitudes above 90 km, accurate numerical evaluation of (15) requires an accurate model of T ′( x , y , z ′, t c ) throughout the MLT, whereas our linear solutions begin to break down near 78 km (see Fig. 7 ). To gauge the effects more simply, we instead apply the spectral filter S AG ( m ) in (17) as an additional filter function multiplier S when inverting the Fourier solution using (3) at z = 78 km for t

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Christopher G. Kruse and Ronald B. Smith

and decelerate the flow from an initial profile. A pseudomomentum diagnostic is used to estimate nondissipative decelerations within these solutions. The linear FR model is also used to estimate linear nondissipative decelerations and to understand how finite forcing duration influences the evolution of a spectrum of MWs with a spectrum of vertical group velocities. Finally, dissipative decelerations by the LSP model are quantitatively evaluated against those in the WRF solutions. 2. Background

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Christopher G. Kruse and Ronald B. Smith

models and observations. Acknowledgments This work was supported by the National Science Foundation under Grant NSF-AGS-1338655. High-performance computing support from Yellowstone (ark:/85065/d7wd3xhc) was provided by NCAR’s Computational and Information Systems Laboratory, sponsored by the National Science Foundation. We would like to acknowledge Andreas Dörnbrack for providing the ECMWF grids to force the WRF simulations, Johannes Wagner for assistance with WRF and ECMWF grids, and Simon Vosper

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Qingfang Jiang, James D. Doyle, Stephen D. Eckermann, and Bifford P. Williams

Holton 1968 ; Fels and Lindzen 1974 ; Lindzen 1981 ; Fritts and Alexander 2003 ). Over the past decade or two, MWs entering the stratosphere have received increasing attention because of new observations from emerging remote sensing tools ( Fritts et al. 2016 ; Pautet et al. 2016 ) and advances in numerical weather prediction models that allow for the use of deep domains ( Kruse and Smith 2015 ). In the high-latitude Southern Hemisphere during austral winter and spring, significant wave activity

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