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

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72....7y&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 1, p. 7-18.

Physics

3

Mesosphere And Lower Thermosphere, Gravity Waves, Airglow All-Sky Imager, Na Lidar

Scientific paper

On 9 October 2007, long-horizontal-wavelength gravity waves were observed for the first time to steepen and form mesospheric bores at the altitude of ~87 km, by an all-sky OH imager located at Fort Collins (41°N, 105°W), Colorado. The collocated sodium lidar simultaneously observed the presence of a temperature inversion layer as the ducting region. One mesospheric bore uniquely later evolved into a large-amplitude soliton-like perturbation. When the gravity wave and the associated soliton-like perturbation passed through the lidar beams, the lidar detected strong vertical disturbance at 90 km, indicating convective instability. A large cold front system recorded several hours before in the troposphere was aligned to phase fronts of these large gravity waves. For all of the 7 mesospheric bores observed over a 5 year period, we found a similar alignment with a cold front 1000-1500 km away as the likely source of these large-scale gravity waves.

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