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Zonal-Mean Temperature Variations Inferred from SABER Measurements on TIMED Compared with UARS ObservationsIn the Numerical Spectral Model (NSM, Mayr et al., 2003), small-scale gravity waves propagating in the north/south direction can generate zonal mean (m = 0) meridional wind oscillations with periods between 2 and 4 months. These oscillations tend to be confined to low latitudes and have been interpreted to be the meridional counterpart of the wave-driven Quasi Biennial Oscillation in the zonal circulation. Wave driven meridional winds across the equator should generate, due to dynamical heating and cooling, temperature oscillations with opposite phase in the two hemispheres. We have analyzed SABER temperature measurements in the altitude range between 55 and 95 km to investigate the existence such variations. Because there are also strong tidal signatures (up to approximately 20 K) in the data, our algorithm estimates both mean values and tides together from the data. Based on SABER temperature data, the intra-annual variations with periods between 2 and 4 months can have amplitudes up to 5 K or more, depending on the altitude. Their amplitudes are in qualitative agreement with those inferred Erom UARS data (from different years). The SABER temperature variations also reveal pronounced hemispherical asymmetries, which are qualitatively consistent with wave driven meridional wind oscillations across the equator. Oscillations with similar periods have been seen in the meridional winds based on UARS data (Huang and Reber, 2003).
Document ID
20050147488
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Huang, Frank T.
(Terranet, Inc. Mitchelville, MD, United States)
Mayr, Hans
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Russell, James
(Hampton Univ. VA, United States)
Mlynczak, Marty
(NASA Langley Research Center Hampton, VA, United States)
Reber, Carl A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: Spring 2005 AGU Meeting
Location: New Orleans, LA
Country: United States
Start Date: May 23, 2005
End Date: May 27, 2005
Sponsors: American Geophysical Union
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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