A R C T E X

Conclusions : Practical recommendations
Main technical error source drifting snow and precipitation effects through flux sensor pathways (over- or
underestimation and misleading flux directions)
Solution
Measurement height should be recorded (variation of snow depth) and must be adjusted according to change of
seasons, service of a present weather detector (weather code, visibility).
Decoupling effect (disturbed temperature profiles) and the determination of the surface temperature
Solution
Additional meteorological data + near-surface vertical gradients of wind, temperature, humidity.
Surf. temp.: IR-Thermometer or pyrgeometer or extrapolation applying a hydrodynamic three-layer temperatureprofile
model (Lüers & Bareiss ACP 10/1).
Measurement height of instrumentation (eddy-covariance systems or gradient towers) should be in appropriate
layer within and above this disturbed wind and temperature profiles.
General
Adaptation to polar conditions of flux data corrections and quality assessment and quality control (QA/QC)
techniques (rotation of coordinate system).
Detection of intermittent turbulent conditions, of free-convection events, of wave motion.
Investigation of meso-scale circulation pattern and micro-scale near surface profiles.
Observation of variability of the snow and tundra soil surface conditions (e.g. Web-Cam).
Finding a compromise between conflicting nature of the effect of the disturbed temperature profile and the search
for an acceptable fetch and desired footprint area.
Johannes Lüers
DACH 2010 Bonn
Universität Bayreuth Bayreuther Zentrum für Ökologie und Umweltforschung
Abteilung Mikrometeorologie johannes.lueers@uni-bayreuth.de
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