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

Fritts, David C. and Kaifler, Natalie and Kaifler, Bernd and Geach, Christopher and Kjellstrand, Bjorn and Williams, Bifford P. and Eckermann, Stephen D. and Miller, Amber and Rapp, Markus and Jones, Glenn and Limon, Michele and Reimuller, Jason and Wang, Ling (2020) Mesospheric Bore Evolution and Instability Dynamics Observed in PMC Turbo Imaging and Rayleigh Lidar Profiling over Northeastern Canada on 13 July 2018. Journal of Geophysical Research: Atmospheres, 124 (14), e2019JD032037/1-26. Wiley. doi: 10.1029/2019JD032037. ISSN 0148-0227.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JD032037

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 ~75x150 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.

Item URL in elib:https://elib.dlr.de/134947/
Document Type:Article
Title:Mesospheric Bore Evolution and Instability Dynamics Observed in PMC Turbo Imaging and Rayleigh Lidar Profiling over Northeastern Canada on 13 July 2018
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Fritts, David C.GATS, Boulder, ColoradoUNSPECIFIED
Kaifler, NatalieDLR, IPAhttps://orcid.org/0000-0002-3118-6480
Kaifler, BerndDLR, IPAhttps://orcid.org/0000-0002-5891-242X
Geach, ChristopherUniv. of Minnesota, Minneapolis, MN, USAUNSPECIFIED
Kjellstrand, BjornColumbia Univ., New York, NY, USAUNSPECIFIED
Williams, Bifford P.GATS Inc., Boulder, CO, USAUNSPECIFIED
Eckermann, Stephen D.NRL, Washington, DC, USAUNSPECIFIED
Miller, AmberColumbia Univ., New York, NY, USAUNSPECIFIED
Rapp, MarkusDLR, IPAhttps://orcid.org/0000-0003-1508-5900
Jones, GlennColumbia Univ., New York, NY, USAUNSPECIFIED
Limon, MicheleColumbia Univ., New York, NY, USAUNSPECIFIED
Reimuller, JasonIntegr. Space. Serv., Boulder, CO, USAUNSPECIFIED
Wang, LingGATS Inc., Boulder, CO, USAUNSPECIFIED
Date:26 April 2020
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:124
DOI :10.1029/2019JD032037
Page Range:e2019JD032037/1-26
Publisher:Wiley
ISSN:0148-0227
Status:Published
Keywords:mesospheric bores, gravity wave breaking, gravity wave self acceleration, bore propagation, bore instabilities, mesospheric turbulence
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Middle Atmosphere
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Lidar
Deposited By: Kaifler, Dr. Natalie
Deposited On:15 May 2020 17:59
Last Modified:22 Jul 2020 10:36

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