Observations of quasi-16-day waves in the mesosphere and lower thermosphere over LangFang, China

Details Observations of quasi-16-day waves in the mesosphere and lower thermosphere over LangFang, China Observations of quasi-16-day waves in the mesosphere and lower thermosphere over LangFang, China

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1846x&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1846

Other

[3332] Atmospheric Processes / Mesospheric Dynamics, [3369] Atmospheric Processes / Thermospheric Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

The quasi-16-day wave, with periods between 12 and 20 days, in the mesosphere and lower thermosphere (MLT) region has been the subject of interest for couple of decades. Its observations are based upon a variety of ground-based and satellite-borne instruments, which often gave different pictures on the seasonal trends, wave amplitudes and heights of occurrence. There are still so many suppositions about the 16-day waves, thus more advanced observations and studies need to be carried on. We present here the observations of the quasi-16-day oscillation by the newly installed MF radar measurements of 60-98km winds and meteor radar measurements of 75-110km winds collected over LangFang (39.4°N, 116.7°E) in China. Continuous observations are in progress and in the present study the wind data we used are from June 2009 to July 2011 by MF radar and from July 2010 to July 2011 by meteor radar. Band-pass filtering technique, Lomb-Scargle periodogram methods and harmonic analysis are applied to the daily mean wind data. Results show that the quasi-16-day wave has amplitudes of 5~15 m/s throughout the MLT region and the zonal component is commonly stronger than the meridional component. It is well indicated that the wave is dominant when the background winds are eastward, which is consistent with the previous numerical simulations. When combining the zonal and meridional components, they demonstrate a quasi-polarization mode of either linear or elliptical characteristic. MF radar's two-year results also show some inter-annual variability of the 16-day wave, especially in summer. Comparing with other mid-latitude sites, such as Wuhan in China, Yamagawa in Janpan, and Adelaide in Australia, the observed characteristics of the quasi-16-wave are similar while differences for the wave amplitudes, heights of occurrence, and periods are also found, which are probably due to the longitudinal and latitudinal differences or year-to-year differences or localized wave activity. The cross-comparisons of the 16-day wind oscillations observed by MF radar and by meteor radar give consistent spectral and phase distributions with also some differences in detail, which need advanced analysis.

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