Preliminary results on the mean winds and low-frequency wave motions in the mesosphere and lower thermosphere over the Andes Lidar Observatory (30°S, 71°W) and their comparisons with Maui, Hawaii (21°N, 156°W)

Details Preliminary results on the mean winds and low-frequency wave motions in the mesosphere and lower thermosphere over the Andes Lidar Observatory (30°S, 71°W) and their comparisons with Maui, Hawaii (21°N, 156°W) Preliminary results on the mean winds and low-frequency wave motions in the mesosphere and lower thermosphere over the Andes Lidar Observatory (30°S, 71°W) and their comparisons with Maui, Hawaii (21°N, 156°W)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa11b1583l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA11B-1583

Physics

[3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3360] Atmospheric Processes / Remote Sensing, [3384] Atmospheric Processes / Acoustic-Gravity Waves, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

The mean winds, diurnal tide, semidiurnal tide and 2-day wave from 80 to 100 km were observed with a newly-relocated meteor radar over Cerro Pachon, Chile (30°S, 71°W) since September 2009. The monthly mean zonal wind showed a transition from westerly at solstices to easterly at spring equinox, which was similar to mean wind structure over Maui, Hawaii (21°N, 156°W). The monthly mean meridional wind was weaker than the zonal wind and a variable vertical structure was observed. The diurnal and semidiurnal tides were the two most dominant low-frequency wave activities and they showed very different seasonal and vertical variations. The semiannual oscillation (SAO) was prominent with equinox maximum and solstice minimum for the diurnal tide at both sites. The semidiurnal tides were usually stronger when the diurnal tides were weaker. The diurnal tides reached their maximum amplitudes around 95 km for both zonal and meridional components while the semidiurnal tides tend to reach their maxima at higher altitude (>100km) where the diurnal tide was severely dissipated. 2-day wave motions were significant at solstices for the meridional wind, but not for the zonal wind. The maximum wave amplitude reached 35 m/s in January. For the mean winds and low-frequency waves, the comparisons with Maui were given at the same time. The mean winds were believed to play an important role in causing the seasonal variation of the diurnal tide. The interactions between tide and planetary wave (PW) and/or gravity wave (GW) could also be effective. The Whole Atmosphere Community Climate Model (WACCM) was used to investigate the mechanisms resulting in tidal variations in terms of wave-mean and wave-wave interactions.

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