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unexpected climatological behavior of mlt gravity wave momentum flux in the lee of the southern andes hot spotThe Southern Argentina Agile MEteor Radar (SAAMER), located at Tierra del Fuego (53.7degS, 67.7degW), has been providing near-continuous high-resolution measurements of winds and high-frequency gravity wave (GW) momentum fluxes of the mesopause region since May 2008. As SAAMER is located in the lee of the largest seasonal GW hot spot on Earth, this is a key location to study GWs and their interaction with large-scale motions. GW momentum flux climatologies are shown for the first time for this location and discussed in light of these unique dynamics. Particularly, the large eastward GW momentum fluxes during local winter are surprising, as these observations cannot be explained by the direct upward propagation of expected large-amplitude mountain waves (MWs) through the eastward stratospheric jet. Instead, these results are interpreted as secondary GWs propagating away from stratospheric sources over the Andes accompanying MW breaking over the Southern Andes.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
DeWit, R. J.
(Zentralanstalt fuer Meteorologie und Geodynamik Vienna, Austria)
Janches, D.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Fritts, D. C.
(GATS, Inc, (Global Atmospheric Technologies and Sciences Boulder, CO, United States)
Stockwell, R. G.
(GATS, Inc, (Global Atmospheric Technologies and Sciences Boulder, CO, United States)
Coy, L.
(Science Systems and Applications, Inc. Greenbelt, MD, United States)
Date Acquired
August 30, 2017
Publication Date
January 28, 2017
Publication Information
Publication: Geophysical Research Letters
Volume: 44
Issue: 2
ISSN: 0094-8276
Subject Category
Meteorology and Climatology
Report/Patent Number
Funding Number(s)
Distribution Limits
Southern Argentina Agile MEteor Radar