0
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Mesospheric Bore Evolution and Instability Dynamics Observed in PMC Turbo Imaging and Rayleigh Lidar Profiling Over Northeastern Canada on 13 July 2018

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Two successive mesospheric bores were observed over northeastern Canada on 13 July 2018 in high‐resolution imaging and Rayleigh lidar profiling of polar mesospheric clouds (PMCs) performed aboard the PMC Turbo long‐duration balloon experiment. Four wide field‐of‐view cameras spanning an area of ~75 × 150 km at PMC altitudes captured the two evolutions occurring over ~2 hr and resolved bore and associated instability features as small as ~100 m. The Rayleigh lidar provided PMC backscatter profiling that revealed vertical displacements, evolving brightness distributions, evidence of instability character and depths, and insights into bore formation, ducting, and dissipation. Both bores exhibited variable structure along their phases, suggesting variable gravity wave (GW) source and bore propagation conditions. Both bores also exhibited small‐scale instability dynamics at their leading and trailing edges. Those at the leading edges comprised apparent Kelvin‐Helmholtz instabilities that were advected downward and rearward beneath the bore descending phases extending into an apparently intensified shear layer. Instabilities at the trailing edges exhibited alignments approximately orthogonal to the bore phases that resembled those seen to accompany GW breaking or intrusions arising in high‐resolution modeling of GW instability dynamics. Collectively, PMC Turbo bore imaging and lidar profiling enabled enhanced definition of bore dynamics relative to what has been possible by previous ground‐based observations, and a potential to guide new, three‐dimensional modeling of bore dynamics. The observed bore evolutions suggest potentially important roles for bores in the deposition of energy and momentum transported into the mesosphere and to higher altitudes by high‐frequency GWs achieving large amplitudes.

          Key Points

          • Mesospheric bores are dramatic events that dominate local instability dynamics accompanying their passage

          • Mesospheric bores can exhibit significant variability in their evolution in time and along their phases

          • Mesospheric bores can exhibit significant instability dynamics at smaller spatial scales at their leading and trailing edges

          Related collections

          Most cited references 66

          • Record: found
          • Abstract: not found
          • Article: not found

          Internal waves of permanent form in fluids of great depth

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Solitary internal waves in deep water

              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Modeling the microphysics of mesospheric ice particles: Assessment of current capabilities and basic sensitivities

                Bookmark

                Author and article information

                Contributors
                dave@gats-inc.com
                Journal
                J Geophys Res Atmos
                J Geophys Res Atmos
                10.1002/(ISSN)2169-8996
                JGRD
                Journal of Geophysical Research. Atmospheres
                John Wiley and Sons Inc. (Hoboken )
                2169-897X
                2169-8996
                13 July 2020
                27 July 2020
                : 125
                : 14 ( doiID: 10.1002/jgrd.v125.14 )
                Affiliations
                [ 1 ] GATS, Boulder Division Boulder CO USA
                [ 2 ] Center for Space and Atmospheric Research Embry‐Riddle Aeronautical University Daytona Beach FL USA
                [ 3 ] German Aerospace Center (DLR) Munich Germany
                [ 4 ] School of Physics and Astronomy University of Minnesota Minneapolis MN USA
                [ 5 ] Department of Physics Columbia University New York NY USA
                [ 6 ] Space Science Division, U.S. Naval Research Laboratory Washington DC USA
                [ 7 ] Department of Physics and Astronomy University of Southern California Sacramento CA USA
                [ 8 ] Rigetti Computing Berkeley CA USA
                [ 9 ] Department of Physics and Astronomy University of Pennsylvania Philadelphia PA USA
                [ 10 ] Integrated Spaceflight Services Boulder CO USA
                Author notes
                [* ] Correspondence to: D. C. Fritts,

                dave@ 123456gats-inc.com

                Article
                JGRD56225 2019JD032037
                10.1029/2019JD032037
                7380296
                74f84d2d-b488-439b-9ea6-51f5f71e3df6
                ©2020. The Authors.

                This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

                Page count
                Figures: 12, Tables: 0, Pages: 26, Words: 3338
                Product
                Funding
                Funded by: DOD | United States Navy | U.S. Naval Research Laboratory (NRL) , open-funder-registry 10.13039/100009917;
                Funded by: German Aerospace Center , open-funder-registry 10.13039/501100002946;
                Funded by: National Aeronautics and Space Administration (NASA) , open-funder-registry 10.13039/100000104;
                Award ID: 80NSSC18K0050
                Categories
                Climate and Dynamics
                Atmospheric Composition and Structure
                Middle Atmosphere: Constituent Transport and Chemistry
                Middle Atmosphere: Energy Deposition
                Atmospheric Processes
                Mesospheric Dynamics
                Middle Atmosphere Dynamics
                Turbulence
                Acoustic‐gravity Waves
                Nonlinear Geophysics
                Turbulence
                Research Article
                Research Articles
                Climate and Dynamics
                Custom metadata
                2.0
                27 July 2020
                Converter:WILEY_ML3GV2_TO_JATSPMC version:5.8.5 mode:remove_FC converted:24.07.2020

                Comments

                Comment on this article