Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa41a1537w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA41A-1537
Other
3334 Middle Atmosphere Dynamics (0341, 0342), 3389 Tides And Planetary Waves
Scientific paper
To date, four CAWSES (Climate and Weather of the Sun Earth System program, a SCOSTEP sponsored program) Global Tidal Campaigns have taken place over the past three years. These, along with several workshops, have provided a forum for the inter-comparison and combination of ground based and satellite observations and models, and covered the four seasons. This work established the equivalence between satellite and meteor radar observations and demonstrated that the reconstructed total tidal fields from satellite analyses must be used for this equivalence. Significant geographical variation in the diurnal and semi-diurnal amplitudes was also demonstrated and shown to vary with season. These comparisons are being extended to include temperature, airglow and constituent signatures. These campaigns have also provided the opportunity to link thermospheric and ionospheric tidal signatures to the neutral signatures from below. Of the four campaigns, the northern hemisphere winter solstice campaign of December/January 2007/2008 has shown the most tidal variability likely because of the strong warmings which took place. Comparisons with models (four GCMs and two mechanistic models) are now taking place and indicate reasonable agreement for some components and disagreement for others. Identifying what improvements are needed before models can duplicate the observed geographical variability in tidal signatures is now under way.
Gerding Michael
Goncharenko Larisa P.
Haeusler K.
Keckhut Philippe
Marsh Daniel R.
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