Accession Number:

ADA522418

Title:

Momentum Flux Estimates for South Georgia Island Mountain Waves in the Stratosphere Observed via Satellite

Descriptive Note:

Journal article

Corporate Author:

NORTHWEST RESEARCH ASSOCIATES BOULDER CO COLORADO RESEARCH ASSOCIATES DIV

Report Date:

2009-01-01

Pagination or Media Count:

6.0

Abstract:

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.

Subject Categories:

  • Atmospheric Physics
  • Geography
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE