Computer Science – Sound
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa54a..03z&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SA54A-03
Computer Science
Sound
3315 Data Assimilation, 3319 General Circulation (1223), 3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3389 Tides And Planetary Waves
Scientific paper
We have developed a spectral module that derives tidal winds from the measured tidal temperature field and effectively eliminates the error amplification near the apparent singularities. We use the algorithm to perform a diagnostic analysis of tidal winds and the Eliassen-Palm flux divergence in the mesosphere and lower thermosphere based on the zonal mean and tidal temperature fields derived from six years of temperature measurements made by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument onboard the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite. The derived zonal mean wind and diurnal tidal amplitude reveal new insights into the mesospheric biennial oscillation (MBO) that exists at both equatorial and midlatitude regions. The equatorial MBO in the zonal mean wind is present in the entire mesosphere from 50 km to 90 km. The equatorial MBO in the temperature amplitude of the diurnal tide occurs near the mesopause region between 80 km and 90 km and is largely coincident with the downward phase propagation of the equatorial MBO in the zonal mean wind, indicating a possible mechanism of wave-mean flow interaction between the two. On the other hand, the midlatitude MBOs in zonal mean wind and the meridional wind in diurnal tide occur at different altitudes, suggesting possibly a remote forcing-response relationship. The acceleration or deceleration of the zonal mean wind due to EP flux divergence that is contributed by the migrating tides peaks at midlatitudes with a typical value of 10-20 m/s/day around 95 km.
Mlynczak Martin G.
Russell James M.
Talaat Elsayed R.
Yee J.
Zhu Xiyu
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