Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa21a..09h&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SA21A-09
Physics
3332 Mesospheric Dynamics, 3369 Thermospheric Dynamics (0358), 3384 Waves And Tides
Scientific paper
We employ semidiurnal tropospheric latent heating rates associated with raindrop formation and inferred from global cloud images of deep convective activity to calculate monthly climatologies of migrating and nonmigrating global tidal fields with the global scale wave model (GSWM). Although the semidiurnal harmonic of the tropical rainfall rate is dominated by the migrating (westward propagating zonal wavenumber 2) component during all months, the GSWM westward propagating zonal wavenumber 5 (W5) and 6 (W6) upper mesospheric and lower thermospheric (MLT) responses often exceed the migrating response. Similarly, the eastward propagating zonal wavenumber 2 (E2) is the dominant nonmigrating component of semidiurnal rainfall, but the E2 tide is comparatively weaker than the W6 or W5 tide aloft. After we overview the salient features of the monthly variable tropospheric forcing and MLT responses for the 13 zonal wavenumbers that we explored, we discuss the roles of the background wind field and the depth and latitudinal breadth of the tidal heating in our interpretation of the GSWM results. We conclude with a discussion of the comparative importance of the GSWM MLT semidiurnal tidal responses to radiative and latent heat sources, and the implications for both observational and numerical studies of the semidiurnal tide in the MLT.
Forbes Jeffrey M.
Hagan Maura E.
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