HR: 14:45h
AN: SA53A-06    [Abstracts]
TI: Atmospheric tides observed from the stratosphere to the lower thermosphere as observed by TIMED
AU: * Talaat, E
EM: elsayed.talaat@jhuapl.edu
AF: The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Yee, J
EM: sam.yee@jhuapl.edu
AF: The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Zhu, X
EM: xun.zhu@jhuapl.edu
AF: The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Russell, J
EM: james.russell@hamptonu.edu
AF: Hampton University Center for Atmospheric Sciences, 23 Tyler Street, Hampton, VA 23668 United States
AU: Mlynczak, M
EM: m.g.mlynczak@larc.nasa.gov
AF: NASA/Langley Research Center Radiation and Aerosol Branch, 21 Langley Boulevard, Hampton, VA 23681 United States
AU: Mayr, H
EM: hmayr@pop900.gsfc.nasa.gov
AF: NASA/Goddard Space Flight Center, Code 961, Greenbelt, MD 20771 United States
AB: Satellite studies have obtained long-term, global-scale depictions of diurnal tides in the middle atmosphere. However, the nature of satellite sampling is that the dynamic features are shifted Doppler-shifted by the satellite motion. As a result, the migrating tide structure is aliased into the zonal mean field for sun-synchronous satellites. Precessing satellites allow a composite picture of the dynamic field to be collected in local time that can be analyzed for diurnal or semidiurnal signals. However, these composites typically take 1-2 months to collect with two node (i.e., the ascending/descending portions of the satellite orbit) sampling. In this paper, we introduce a new method to extract the migrating tides from observations taken by a slowly precessing satellite. Specifically, we present observations of migrating tides, nonmigrating tides, and planetary waves from the lower stratosphere to the lower thermosphere as observed by TIMED/SABER. The zonal mean temperatures are then subtracted from each day of data and the perturbation fields are fitted to extract the nonmigrating tides and planetary waves. We describe the temporal variability of the migrating tide and evaluate possible nonlinear sourcing mechanisms for the nonmigrating tidal components using both observations and simulations from a mechanistic fully nonlinear dynamical model.
DE: 3384 Waves and tides
SC: SPA-Aeronomy [SA]
MN: 2005 Joint Assembly