Non-Migrating Tidal Effects on the Upper Atmosphere: New Tropospheric Forcing

Physics

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[2415] Ionosphere / Equatorial Ionosphere, [2427] Ionosphere / Ionosphere/Atmosphere Interactions, [3369] Atmospheric Processes / Thermospheric Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

Space-borne observations of thermospheric temperature, wind, and airglow measurements, as well as ionosphereric density and drift diagnostics exhibit notable longitudinal variations during geomagnetically quiescent conditions. Many of these variations can been attributed to nonmigrating tides of tropospheric origin and have been successfully replicated by the National Center for Atmospheric Research (NCAR) thermosphere-ionosphere-mesosphere-electrodynamics general circulation model (TIME-GCM) when it includes Global-Scale Wave Model (GSWM-02) forcing at the lower boundary (ca. 30 km). However, these TIME-GCM/GSWM-02 results do not capture the observed seasonal variability of the nonmigrating tides. Recently, Zhang et al. (2009a,b) developed new tropospheric tidal forcing based upon International Satellite Cloud Climatology Project (ISCCP) and Tropical Rainfall Measuring Mission (TRMM) observations and reported updated GSWM-09 nonmigrating tidal climatologies. Herein, we present signatures of nonmigrating tides from a new set of TIME-GCM/GSWM-09 simulations and assess whether this updated model is better able to capture the observed seasonal variations of these tides in the thermosphere and ionosphere during solar minimum conditions. Zhang, X., J.M. Forbes, and M.E. Hagan (2009a) Longitudinal Variation of Tides in the MLT Region: Part 1, Tides Driven by Troposphere Solar Radiative Heating, submitted to Journal of Geophysical Research. Zhang, X., J.M. Forbes, and M.E. Hagan (2009b) Longitudinal Variation of Tides in the MLT Region: Part 2, Relative Effects of Solar Radiative and Latent Heating, submitted to Journal of Geophysical Research.

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