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Large‐Amplitude Mountain Waves in the Mesosphere Observed on 21 June 2014 During DEEPWAVE: 1.Wave Development, Scales, Momentum Fluxes, and Environmental Sensitivity
Journal of Geophysical Research: Atmospheres
  • Michael J. Taylor, Utah State University
  • Pierre-Dominique Pautet, Utah State University
  • David C. Fritts, GATS Inc.
  • Bernd Kaifler, German Aerospace Center
  • Steven M. Smith, Boston University
  • Yucheng Zhao, Utah State University
  • Neal R. Criddle, Utah State University
  • Pattilyn McLaughlin, Utah State University - Center for Atmospheric and Space Sciences
  • William R. Pendleton, Jr., Utah State University
  • Michael P. McCarthy, University of Washington
  • Gonzalo Hernandez, University of Washington
  • Stephen D. Eckermann, National Research Laboratory
  • James Doyle, Naval Research Laboratory
  • Markus Rapp, German Aerospace Center
  • Ben Liley, National Institute of Water and Atmospheric Research
  • James M. Russell, III, Hampton University
Document Type
Wiley-Blackwell Publishing, Inc.
Publication Date

A remarkable, large‐amplitude, mountain wave (MW) breaking event was observed on the night of 21 June 2014 by ground‐based optical instruments operated on the New Zealand South Island during the Deep Propagating Gravity Wave Experiment (DEEPWAVE). Concurrent measurements of the MW structures, amplitudes, and background environment were made using an Advanced Mesospheric Temperature Mapper, a Rayleigh Lidar, an All‐Sky Imager, and a Fabry‐Perot Interferometer. The MW event was observed primarily in the OH airglow emission layer at an altitude of ~82 km, over an ~2‐hr interval (~10:30–12:30 UT), during strong eastward winds at the OH altitude and above, which weakened with time. The MWs displayed dominant horizontal wavelengths ranging from ~40 to 70 km and temperature perturbation amplitudes as large as ~35 K. The waves were characterized by an unusual, “saw‐tooth” pattern in the larger‐scale temperature field exhibiting narrow cold phases separating much broader warm phases with increasing temperatures toward the east, indicative of strong overturning and instability development. Estimates of the momentum fluxes during this event revealed a distinct periodicity (~25 min) with three well‐defined peaks ranging from ~600 to 800 m2/s2, among the largest ever inferred at these altitudes. These results suggest that MW forcing at small horizontal scales (km) can play large roles in the momentum budget of the mesopause region when forcing and propagation conditions allow them to reach mesospheric altitudes with large amplitudes. A detailed analysis of the instability dynamics accompanying this breaking MW event is presented in a companion paper, Fritts et al. (2019,

Citation Information
Taylor, M. J., Pautet, P.‐D., Fritts, D. C., Kaifler, B., Smith, S. M., Zhao, Y., et al. (2019). Large‐amplitude mountain waves in the mesosphere observed on 21 June 2014 during DEEPWAVE: 1. Wave development, scales, momentum fluxes, and environmental sensitivity. Journal of Geophysical Research: Atmospheres, 124, 10364–10384.