Inter-annual Variability of Nonmigrating Tides Forced by Tropical Convection

Details Inter-annual Variability of Nonmigrating Tides Forced by Tropical Convection Inter-annual Variability of Nonmigrating Tides Forced by Tropical Convection

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa34a..01o&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA34A-01

Physics

2437 Ionospheric Dynamics, 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 3332 Mesospheric Dynamics, 3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves

Scientific paper

Current observations and models demonstrate unequivocally that non-Sun-synchronous (nonmigrating) tides due to deep tropical convection produce large longitudinal and local time variations in bulk ITM properties, i.e., temperature, wind, composition and plasma density, to name a few. We thus stand at an exciting research frontier: understanding how persistent, large-scale tropospheric weather systems affect Earth's upper atmosphere and geospace environment. One science challenge question is the inter-annual variability of the nonmigrating tides. This paper focusses on quasi-biennial and longer term tidal variations presumably induced by the QBO and the solar cycle. Multiple years of satellite-borne tidal temperature and wind observations show considerable amplitude variations on these time-scales, from the MLT region (SABER and TIDI on TIMED) to the upper thermosphere (CHAMP and GRACE). The results are interpreted using an empirical fit model and the WACCM general circulation model. Possible implications for the thermospheric energy budget are discussed.

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