Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa22a..06w&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA22A-06
Other
3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342)
Scientific paper
The CAWSES global tidal campaign is one of the projects sponsored under Theme 3, Atmospheric Coupling Processes, of the international program, Climate and Weather of the Sun Earth System (CAWSES, a SCOSTEP sponsored program). It has been organized to coordinate and facilitate work by various groups around the world on understanding terrestrial tides. The goal of this project is to provide global data sets for several concentrated time periods over the next few years. These will allow the characterization of the heating sources, tidal components, and tidal effects from the surface of the Earth to the ionosphere, and support and stimulate the use of models to simulate the conditions during these campaigns. Recognition of the importance of atmospheric tides to the dynamics, electrodynamics and constituent distributions above the stratopause is growing. Atmospheric tides are global in nature, dominate the dynamics and constituent signatures in the mesosphere and lower thermosphere and modulate the ionized components in the ionosphere. As they are forced through solar heating in the troposphere, stratosphere and thermosphere, they have a direct relationship to the sun. Longitudinal variations in latent heat release and water vapour, non- linear interactions amongst tidal components and with planetary waves and filtering effects associated with the background wind and temperature fields also affect their amplitudes. Hence their specification requires global observations of their sources, their propagation characteristics, their effects and the background atmosphere through which they propagate. Ground based networks and satellite observations complement each other and in combination provide appropriate coverage of tides. Global models are necessary for the simulation of these modes. The first tidal campaign took place from September 1 to October 31, 2005 to coincide with the "World Month" campaign undertaken by the Incoherent Scatter Radar community. Radar, optical instrumentation, ionospheric observations and satellite data were collected during this time period and are now starting to be analysed. Further campaigns are planned. In this paper we describe the overall organization of this effort and initial insights gained from the first campaign.
Forbes Jeffrey
Grieger Norbert
Gurubaran S.
Hagan Maura
Lieberman Ruth
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