Abstract
Abstract. The spring of 1997 has represented a stable period of operation for the joint University of Tromsø / University of Saskatchewan MF radar, being between refurbishment and upgrades. We examine the horizontal winds from the February to June inclusive and also include estimates of energy dissipation rates derived from signal fading times and presented as upper limits on the turbulent energy dissipation rate, ε. Here we address the periodicity in the dynamics of the upper mesosphere for time scales from hours to one month. Thus, we are able to examine the changes in the spectral signature of the mesospheric dynamics during the transition from winter to summer states.Key words. Meteorology and atmospheric dynamics (middle atmosphere dynamics; turbulence; waves and tides).
Highlights
The joint University of Tromsù/University of Saskatchewan MF radar, located in northern Norway at 69°N19°E, has, during the winter of 1996/7, been refurbished to some degree
We are able to examine the changes in the spectral signature of the mesospheric dynamics during the transition from winter to summer states
The quasi 2-day wave is weak in amplitude relative to the other modes but is in evidence in the meridional wind and energy dissipation rate well below the summer mesopause
Summary
The joint University of Tromsù/University of Saskatchewan MF radar, located in northern Norway at 69°N19°E, has, during the winter of 1996/7, been refurbished to some degree. In May, the tendency of April is reinforced at the tidal time scales, the diurnal mode dominating the sub-summer mesopause heights. A less obvious feature is that the 4-day mode is quite persistent in the meridional wind as opposed to the zonal component.
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