New Perspectives on Atmospheric Tides and Planetary Waves From the TIMED Mission

Details New Perspectives on Atmospheric Tides and Planetary Waves From the TIMED Mission New Perspectives on Atmospheric Tides and Planetary Waves From the TIMED Mission

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa33b..05f&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA33B-05

Physics

3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3369 Thermospheric Dynamics (0358), 3384 Waves And Tides

Scientific paper

Measurements from the TIMED satellite afford a new perspective on tides and planetary waves in the mesosphere-lower thermosphere-ionosphere (MLTI) region (ca. 60-180 km). Migrating diurnal, semidiurnal and terdiurnal tides are now measured in the region where the transition occurs from dominance of upward-propagating waves to in-situ generation by EUV heating. The 73-deg inclination of TIMED enables investigations of stationary and planetary wave vertical and latitudinal coupling, and provides insights into semidiurnal and terdiurnal oscillations that tend to dominate at high latitudes. The high inclination of TIMED has also enabled joint space-based and ground-based investigations, since many of the instrument arrays are most prevalent at middle and high latitudes, including Antarctica. Due to the exponential growth of upward-propagating tides, the high altitudes reached by TIMED instruments make possible identification of a wider spectrum of waves, leading to new interpretations in terms of wave-wave interactions and convective forcing. In addition, TIMED's near-continuous sampling permits the evolution of planetary waves to be delineated, affording the opportunity to identify source regions, regions of amplification, and ducting through the background wind field. All of these new perspectives greatly improve our ability to formulate and test theories, and to exercise a range of numerical models. In this paper, examples of TIMED analyses and investigations exemplifying these capabilities will be presented.

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