Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..54g&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
gurubara@iigs.iigm.res.in The mesosphere-lower thermosphere (MLT) region is an important critical transition region that dynamically couples the middle atmosphere (20-100 km) with the upper atmosphere and ionosphere. This is the region where atmospheric gravity waves often achieve convectively unstable amplitudes and thereby dissipate, generate turbulence and deposit heat and momentum in the mean flow. Turbulence influences chemistry through the transport and distribution of long-lived chemical species such as NO. Tidal oscillations of 24-hour (diurnal) and 12-hour (semi-diurnal) periods are generated by water vapor and ozone insolation absorption in the troposphere and stratosphere and propagate through the mesopause into the lower thermosphere. Tides represent a major source of temperature and wind variability in the tropical mesopause region and are also capable of generating turbulence and depositing heat and momentum above 85 km. Other planetary-scale waves propagating through the mesosphere and contributing to its energy and momentum budgets are the global-scale normal modes, namely, the quasi-2-day and 16-day waves, the 6.5-day wave and the equatorially trapped wave mode, namely, the 3.5-day ultrafast Kelvin wave. Through several collaborative studies making use of the existing MLT radar network, the IHY2007 programme would provide enough opportunities to examine how the above dynamical processes behave in longer time scales and influence the climate of the middle atmosphere. Long-term data sets on important planetary-scale wave parameters would also address the important issue of Sun/Earth connections induced by a possible planetary wave response to solar variability. This talk is intended to motivate and promote such collaborative studies aimed to understand the processes responsible for the long-term variabilities of planetary-scale waves and their role in the climate of the middle atmosphere.
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