Longitudinal variation of tides in the MLT region: 2. Relative effects of solar radiative and latent heating

Details Longitudinal variation of tides in the MLT region: 2. Relative effects of solar radiative and latent heating Longitudinal variation of tides in the MLT region: 2. Relative effects of solar radiative and latent heating

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11506317z&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A6, CiteID A06317

Physics

10

Atmospheric Processes: Tides And Planetary Waves, Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Composition And Structure: Cloud/Radiation Interaction, Atmospheric Processes: Land/Atmosphere Interactions (1218, 1631, 1843)

Scientific paper

Part 2 of our study examines the relative importance of radiative heating and latent heating in accounting for vertically propagating tides that impose longitude variability on mesosphere-lower thermosphere (MLT) winds, temperatures, and densities. Our results are based upon numerical simulations using the Global-Scale Wave Model (GSWM) and new tidal heating rates derived from International Satellite Cloud Climatology Project (ISCCP) radiative fluxes (see part 1), Tropical Rainfall Measuring Mission (TRMM) latent heating profiles, and TRMM rainfall rates. Contrary to previous results and general perceptions, we demonstrate that radiative heating is more important than latent heating in accounting for MLT longitude variability due to tides although latent heating causes some large nonmigrating tidal oscillations such as DE3. Through comparison with TIMED SABER temperature measurements, the model results are shown to approximate many observed features of this longitude variability.

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