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Displaying: 1 - 2 of 2
1. Estimation of temperatures in the upper mesosphere using meteor decay times observed on 32.55 MHz and 53.5 MHz

Objective 1: Proof of the possibility to estimate temperatures from meteor decay times using co-located, simultaneous meteor observations on two, well separated frequencies (32.55 MHz/SKiYMET radar and 53.5 MHz/ALWIN MST radar) without the assumption of a predetermined temperature gradient. The second method for determining temperature height profiles uses the direct measurement of the ambipolar diffusion coefficient in conjunction with pressure data to estimate temperatures. Pressure data from empirical models are often too unreliable, therefore pressure data derived from rocket-borne falling spheres measurements could be used for a reliable temperature determination. Objective 2: Proof of the method using co-located meteor radar measurements and falling sphere soundings conducted in 2002 at Andenes (69N) during the MaCWAVE campaign. It should be possible to estimate meteor temperature profiles in a height range between 82 km and about 94 km.

Radar Atmospheric processes Geophysics Arctic Atmosphere temperature
2. Fluxes of Mercury from the Arctic Ice Surface during Polar Sunrise Conditions and Melt Conditions

The objectives of this project are: A) to determine the pathway for the transfer of mercury in snowmelt to sea water during the melt period at Alert; B) to determine the extent of open water and wet ice in the summer Arctic as it affects the surface exchange of Hg using satellite radar imagery; and C) to determine the atmospheric dynamics associated with the photochemistry of mercury episodically during the polar sunrise period.

trace metals satellite radar imagery radar Atmospheric processes melt open water acoustic sounding mercury Mapping Heavy metals Long-range transport Spatial trends Contaminant transport Hg Modelling Ice Arctic GIS radar imagery wet ice Atmosphere atmospheric boundary layer boundary layer