Seasonal and interannual variability of gravity waves from airglow imaging at Adelaide and Alice Springs

Details Seasonal and interannual variability of gravity waves from airglow imaging at Adelaide and Alice Springs Seasonal and interannual variability of gravity waves from airglow imaging at Adelaide and Alice Springs

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa44a..07g&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA44A-07

Statistics

[3384] Atmospheric Processes / Acoustic-Gravity Waves

Scientific paper

The mesosphere and lower thermosphere (MALT) is a region largely controlled by tides and gravity waves. In this paper, we explore the seasonal and interannual variability of the MALT and its relationship to gravity wave fluxes using long-term airglow measurements at two Australian sites. The data presented here are the result of more than seven years of airglow imager observations at Adelaide 34°55’S, 138°36’ E) and Alice Springs (23°42’ S, 133°53’ E). The imagers measure rotational temperature and intensity of two atmospheric emissions, OH Meinel (6, 2) and O2 atmospheric (0, 1). Here we present analysis of the seasonal and interannual variation of gravity waves at both Australian sites. Automated analysis is used to determine individual gravity wave wavelength and orientation in each airglow image. Gravity wave statistics are then compiled and correlated with tropospheric disturbances, as characterized by Australian rainfall statistics and low pressure systems. By these methods, both seasonal variations in gravity wave occurrence and directionality and storm-related wave events can be identified.

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