Publication Date:
2022-05-26
Description:
Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Space Physics 119 (2014): 630-645, doi:10.1002/2013JA018955.
Description:
Using 5 years of all-sky OH airglow imager data over Yucca Ridge Field Station, CO (40.7°N, 104.9°W), from September 2003 to September 2008, we extract and deduce quasi-monochromatic gravity wave (GW) characteristics in the mesopause region. The intrinsic periods are clustered between approximately 4 and 10 min, and many of them are unstable and evanescent. GW occurrence frequency exhibits a clear semiannual variation with equinoctial minima, which is likely related to the seasonal variation of background wind. The anomalous propagation direction in January 2006, with strong southward before major warming starting in 21 January and weak southward propagation afterward, was most likely affected by stratospheric sudden warming. The momentum fluxes show strongly anticorrelated with the tides, with ~180° out of phase in the zonal component. While in the meridional component, the easterly maximum occurred approximately 2–6 h after maximum easterly tidal wind. However, the anticorrelations are both weakest during the summer. The dissipating and breaking of small-scale and high-frequency GW's components could have a potential impact on the general circulation in the mesopause region.
Description:
This work was carried out at the
University of Science and Technology of
China, with support from the National
Natural Science Foundation of China
grants (41025016, 41127901, 41225017,
41074108, and 41121003), the National
Basic Research Program of China grant
2012CB825605, the Chinese Academy
of Sciences Key Research Program
KZZD-EW-01, and the Fundamental
Research Funds for the Central
Universities.
Description:
2014-07-31
Keywords:
Airglow image
;
Mesopause
;
Gravity wave
;
Momentum flux
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
application/pdf
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