In this work eddy covariance measurements for determining the sensible heat flux, latent heat flux and the shear stress near the earth's surface are presented. Two systems at different sites are considered in the following investigations, one measures continuously close to the village Ny-Ålesund (N 78° 55.287’, E 011° 54.851’) since September 2010, the other one was located on Kongsvegen glacier (N 78° 50.725’, E 012° 40.106’) for a short period in April 2011 contemporary to the Polar Airborne Measurements and Arctic Regional Climate Model Simulation Project (PAMARCMiP) 2011. The comparison of the measured data for a selected period in April 2011 shows an example of the possible small scale spatial variability of exchange processes depending on the topographic site conditions and synoptic influences. Further, data of November 2010, evaluated at the site Ny-Ålesund are shown as example of the possible small scale temporal variability of exchange processes, in detail the formation of external gravity waves in polar night conditions. All this work shall lead to a better understanding of the exchange processes in the Arctic Atmospheric Boundary Layer.