Lidar Measurements of Gravity Waves from Eureka During the Canadian Arctic ACE Validation Campaign

Details Lidar Measurements of Gravity Waves from Eureka During the Canadian Arctic ACE Validation Campaign Lidar Measurements of Gravity Waves from Eureka During the Canadian Arctic ACE Validation Campaign

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa33a..03m&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA33A-03

Physics

3334 Middle Atmosphere Dynamics (0341, 0342), 3362 Stratosphere/Troposphere Interactions, 3384 Acoustic-Gravity Waves

Scientific paper

The composition variations of critical species such as ozone in the polar middle atmosphere is intimately tied to dynamical variations. The suite of instruments at the Polar Environment Atmosphere Research Laboratory (PEARL), part of the Canadian Network for the Detection of Atmospheric Change (CANDAC), is well complemented to measure both the chemical and dynamic state of the middle atmosphere, and in particular perturbations and mixing due to waves. Stratospheric and mesospheric gravity wave spectra are derived from relative density measurements made in February and March 2009 with the CANDAC - Environment Canada DIAL lidar in Eureka, Canada (80°N, 86°W) to investigate the variability and magnitude of the perturbations due to gravity waves. Duck and colleagues have shown previously that the gravity wave spectrum over Eureka is highly influenced by the polar vortex and appears continuous for nightly averages. Analysis on shorter timescales (30 minutes) for 20 nights of measurements by Whiteway showed that, in general, a random superposition of wavelengths is observed. A distinct dominant vertical wavelength was present on only two occasions. This result is in contrast to middle latitude measurements of the upper stratosphere using the University of Western Ontario's Purple Crow Lidar, which show that gravity wave spectra typically comprise only four distinct waves on any given night, with most of the kinetic energy being carried by one or two dominant waves. The current Eureka measurements will be analyzed using Prony's method to determine if only a few waves are indeed present at these latitudes as well. We will also investigate if the number of waves is related to location of the vortex.

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