Abstract
We have investigated the variation of mean wind almost continuously monitored by the Kunming (25.6°N, 103.8°E) MF radar over the period from August 2008 to August 2010. The mean circulation in zonal winds presents a obvious annual variation above 90km and semiannual variation below 85km, but has different direction up 90km and down 85km. An eastward flow is prevailing in spring and autumn below 85km and in spring and summer up 90km with amplitudes as large as 24m/s and 21m/s, respectively. But a westward flow dominates in summer and winter below 85km and in autumn and winter up 90km with amplitudes as large as −12m/s and −10m/s, respectively. Meanwhile the eastward wind dominates for all months at 85–90km. The annual variation also appears in meridional wind below 90km, which means a poleward flow occurs from September to April with amplitude maximum of 11m/s, while the equatorward wind dominates almost for two years with maximum of −26m/s above 90km. Comparison of the wind vertical profile along with standard errors with the HWM07 model winds shows that the zonal wind agrees well with model in winter, autumn and summer, but the meridional wind in spring, winter and summer.
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