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We explore tropospheric latent heat releaseas a source of variability of the diurnal tide in the mesosphere and lowerthermosphere (MLT) in two ways. First, we present analyses of the UARS WINDIIhorizontal wind data, which reveal signatures of nonmigrating tidal effects aslarge as 25 m/s during both vernal equinox and boreal winter. These effects areof greater relative importance during the latter season. Complementaryglobal-scale wave model (GSWM) results which account for a tropospheric latentheat source generally underestimate the observed nonmigrating tidal effects butcapture the seasonal variability that is observed. Second, we pursue a newparameterization scheme to investigate seasonal variability of the migratingdiurnal tidal component of the latent heat source with GSWM. These resultsconfirm previously reported seasonal trends, but suggest that the MLT effectsmay be as much as an order of magnitude larger than earlier predictions

Diurnal tidal variability in the upper mesosphere and lower thermosphere