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

used for the short- and longwave radiation processes ( Fu et al. 1997 ). The initial fields for the model are created from a three-dimensional variational data assimilation (i.e., 3DVAR) method ( Daley and Barker 2001 ). Lateral boundary conditions for the outermost grid mesh are derived from Navy Global Environmental Model (NAVGEM) forecast fields ( Hogan et al. 2014 ). The computational domain contains two horizontally nested grid meshes of 256 × 150 and 433 × 358 grid points, and the

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Ronald B. Smith and Christopher G. Kruse

many clever methods have been devised to observe gravity waves [e.g., balloon soundings, vertically pointing lidar and frequency-modulated continuous-wave (FMCW) radar, and limb and nadir infrared detection from satellites], they usually observe only one or two physical variables. For example, recent advances in superpressure balloon technology ( Vincent and Hertzog 2014 ) provide good horizontal structure of pressure and wind, but vertical air motion must be inferred and temperature is not

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