Mesospheric bore formation from large-scale gravity wave perturbations observed by collocated all-sky OH imager and sodium lidar

Details Mesospheric bore formation from large-scale gravity wave perturbations observed by collocated all-sky OH imager and sodium lidar Mesospheric bore formation from large-scale gravity wave perturbations observed by collocated all-sky OH imager and sodium lidar

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa11a1454y&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA11A-1454

Physics

Geophysics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3384] Atmospheric Processes / Acoustic-Gravity Waves, [4455] Nonlinear Geophysics / Nonlinear Waves, Shock Waves, Solitons

Scientific paper

On the night of 9 October 2007, long-horizontal-wavelength large-amplitude gravity waves were observed to steepen and form mesospheric bores at the altitude of ~87 km by the Kyoto University all-sky OH imager located at Fort Collins (41N, 105W), Colorado. The collocated Colorado State University sodium lidar simultaneously observed the presence of a temperature inversion layer implicating that both the gravity wave and bores were propagating in a ducted region. Moreover, a large cold front system was recorded several hours before in the troposphere which aligned with the phase fronts of these large gravity waves. For each of the 7 mesospheric bores observed in 2003-2008, we found similarly aligned cold front 1000 - 1500 km away, suggesting that the cold front is the likely source of the bore-generating large-scale gravity wave.

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