Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa41a1542c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA41A-1542
Physics
0342 Middle Atmosphere: Energy Deposition (3334), 3334 Middle Atmosphere Dynamics (0341, 0342), 3367 Theoretical Modeling, 3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves
Scientific paper
The migrating diurnal tide is one of the dominant dynamical features of the Earth's Mesosphere and Lower Thermosphere (MLT) region, particularly at low latitudes. While the long term evolution of the migrating diurnal tide is dependent primarily upon seasonal changes in the solar heating profile and the background atmosphere, short term fluctuations on the order of a few days have been observed, occurring at time scales too short to be explained by changes in solar heating. These short-term fluctuations are often manifested as a modulation of tidal amplitudes at frequencies corresponding to those of propagating planetary wave modes, suggesting that short term variability in the tide can be driven by nonlinear wave-wave interactions between the tide and various propagating planetary waves also present in the region. However, many questions still remain about the nature of such interactions. The conditions under which various planetary waves may or may not interact with the atmospheric tides, as well as the mechanisms and overall effects of a planetary wave / tidal interaction are still unclear. In this study, we explore the effect of ultra fast Kelvin waves (UFKWs) on the migrating diurnal tide. The UFKWs are eastward propagating disturbances that occur sporadically throughout the year in the low latitude MLT region where the migrating diurnal tide is large. The NCAR Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model (TIME-GCM) is used to simulate a control case without a UFKW and cases in which a UFKW of various magnitudes is present. Use of a global circulation model in this way allows us to characterize the effects of UFKW on the migrating diurnal tide and to investigate the underlying physical processes responsible for the interactions. Initial studies have indicated the UFKW does clearly modulate the amplitude of the tidal parameters influencing the overall amplitude and spatial structure of the migrating diurnal tide.
Chang Chi-Ling
Liu Hongya
Palo Scott E.
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