Abundant short-period, small-scale gravity waves have been identiﬁed in the mesosphere and lower thermosphere over Halley, Antarctica, via ground-based airglow image data. Although many are observed as freely propagating at the heights of the airglow layers, new results under modeled conditions reveal that a signiﬁcant fraction of these waves may be subject to reﬂections at altitudes above and below.The waves may at times be trapped within broad thermal ducts, spanning from the tropopause or stratopause to the base of the thermosphere (~140 km), which may facilitate long-range propagation (~1000s of km) under favorable wind conditions.
Geophysical Research Letters
American Geophysical Union
Grant or Award Name
NSF AGS-1113427, AGS-1001074 and NSF Office of Polar Programs OPP-9816465, OPP-0338364
Scholarly Commons Citation
Snively, J. B., K. Nielsen, M. P. Hickey, C. J. Heale, M. J. Taylor, and T. Moffat-Griffin (2013), Numerical and statistical evidence for long-range ducted gravity wave propagation over Halley, Antarctica, Geophys. Res. Lett., 40, doi:10.1002/grl.50926.