13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

Distribution of Gravity Wave Parameters over Eureka, Nunavut using the All Sky Imager

17 Jun 2015, 19:14
2m
CCIS Ground Floor PCL lounge (University of Alberta)

CCIS Ground Floor PCL lounge

University of Alberta

Poster (Student, Not in Competition) / Affiche (Étudiant(e), pas dans la compétition) Atmospheric and Space Physics / Physique atmosphérique et de l'espace (DASP-DPAE) DASP Poster Session with beer / Session d'affiches avec bière DPAE

Speaker

Chris Vail (University of New Brunswick)

Description

This work will present the analysis approach developed to detect of gravity waves and the variation in gravity wave parameters deduced from the airglow images taken by the Polar Environment Atmospheric Research Laboratory (PEARL) All Sky Imager (PASI). PASI has been in operation since November 2007 at PEARL in Eureka, Nunavut with images being taken on average every minute during the winter seasons. An automated data analysis approach has been developed to diagnose the gravity wave parameters in a time efficient manner. PASI is a CCD imaging system with six different spectral band narrow band filters. The filters of interest in this research isolate the following airglow emissions: atomic sodium (at 589.3 nm), atomic oxygen green line (at 557.7nm), and hydroxyl (at 720-910nm notched at 865nm due to the molecular oxygen). PASI cycles through the different filters with the hydroxyl filter interleaved between the other filters in the sequence. The gravity wave parameters to be presented are the horizontal and vertical wavelength, intrinsic period and propagation direction. In each image occurrences of these waves are defined in terms of horizontal spatial wavenumber and phase. Temporal phase information is deduced from consecutive images which contain wave signatures with similar horizontal wavenumbers. The vertical wavelength is determined from consecutive images between the different airglow emissions using an approach similar to determining the temporal phase. This work will present monthly variations of these parameters along with their uncertainties for several seasons. In particular, the daily variation in gravity wave occurrence during the January 2009 major stratospheric warming will be highlighted.

Primary author

Chris Vail (University of New Brunswick)

Co-author

Dr William Ward (University of New Brunswick)

Presentation Materials