Estimation of the vertical diffusion coefficient in MLT region from the migrating diurnal tides observed by TIMED

Details Estimation of the vertical diffusion coefficient in MLT region from the migrating diurnal tides observed by TIMED Estimation of the vertical diffusion coefficient in MLT region from the migrating diurnal tides observed by TIMED

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa54a..02x&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA54A-02

Physics

3334 Middle Atmosphere Dynamics (0341, 0342), 3369 Thermospheric Dynamics (0358), 3379 Turbulence (4490), 3384 Acoustic-Gravity Waves, 3389 Tides And Planetary Waves

Scientific paper

We use TIMED global temperature and wind data from 2002-2007 to investigate the damping of the diurnal tide. Horizontal winds are measured by TIDI and are calculated from SABER temperature measurements. The SABER derivation of tidal wind depends on the damping and, therefore, the discrepancy between TIDI and SABER determinations of the wind tides can be used to determine the damping. For example, the amplitude of diurnal tide of the meridional wind exhibits very obvious asymmetries between the northern and southern hemispheres. The estimated vertical diffusion coefficient is that which gives the best agreement between the SABER and TIDI diurnal tide winds. The results show that there can be very large diffusion coefficients in very narrow vertical regions. The peak of the diffusion coefficient is at higher altitude in summer than in winter in both hemispheres. The derived diffusion coefficients exhibit obvious asymmetries between the northern and the southern hemispheres. In both hemispheres, the diffusion coefficients are larger at 40 than at 20 degrees latitude.

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