Physics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3612816a&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 12, CiteID L12816
Physics
8
Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: Stratosphere/Troposphere Interactions, Atmospheric Processes: Acoustic-Gravity Waves
Scientific paper
We show high-resolution satellite observations of mountain wave events in the stratosphere above South Georgia Island in the remote southern Atlantic Ocean and compute the wave momentum fluxes for these events. The fluxes are large, and they imply important drag forces on the circulation. Small island orography is generally neglected in mountain wave parameterizations used in global climate models because limited model resolution treats the grid cell containing the island as ocean rather than land. Our results show that satellite observations can be used to quantitatively constrain mountain wave momentum fluxes, and they suggest that mountain waves from island topography may be an important missing source of drag on the atmospheric circulation.
Alexander Michael J.
Broutman Dave
Eckermann Stephen D.
Ma Jun
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