气候变化领域集成服务门户(CCPortal): Mesospheric Bore Evolution and Instability Dynamics Observed in PMC Turbo Imaging and Rayleigh Lidar Profiling Over Northeastern Canada on 13 July 2018

CCPortal

DOI	10.1029/2019JD032037
	Mesospheric Bore Evolution and Instability Dynamics Observed in PMC Turbo Imaging and Rayleigh Lidar Profiling Over Northeastern Canada on 13 July 2018
	Fritts D.C.; Kaifler N.; Kaifler B.; Geach C.; Kjellstrand C.B.; Williams B.P.; Eckermann S.D.; Miller A.D.; Rapp M.; Jones G.; Limon M.; Reimuller J.; Wang L.
发表日期	2020
ISSN	2169897X
卷号	125 期号:14
英文摘要	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. ©2020. The Authors.
英文关键词	bore instabilities; bore propagation; gravity wave breaking; gravity wave self-acceleration; mesospheric bores; mesospheric turbulence
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185900
作者单位	GATS, Boulder Division, Boulder, CO, United States; Center for Space and Atmospheric Research, Embry-Riddle Aeronautical University, Daytona Beach, FL, United States; German Aerospace Center (DLR), Munich, Germany; School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, United States; Department of Physics, Columbia University, New York, NY, United States; Space Science Division, U.S. Naval Research Laboratory, Washington DC, United States; Department of Physics and Astronomy, University of Southern California, Sacramento, CA, United States; Rigetti Computing, Berkeley, CA, United States; Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA, United States; Integrated Spaceflight Services, Boulder, CO, United States
推荐引用方式 GB/T 7714	Fritts D.C.,Kaifler N.,Kaifler B.,et al. Mesospheric Bore Evolution and Instability Dynamics Observed in PMC Turbo Imaging and Rayleigh Lidar Profiling Over Northeastern Canada on 13 July 2018[J],2020,125(14).
APA	Fritts D.C..,Kaifler N..,Kaifler B..,Geach C..,Kjellstrand C.B..,...&Wang L..(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,125(14).
MLA	Fritts D.C.,et al."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 125.14(2020).