A R C T E X
A R C T E X
A R C T E X
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Surface energy budget (SEB) of permafrost on Svalbard<br />
Annual cycle<br />
During polar night - main components SEB:<br />
* IR-radiation *sensible heat flux *heat input refreezing active layer<br />
Determining factor surface temperature of snow:<br />
*incoming atmospheric IR-radiation and *downward sensible heat flux<br />
During spring - Apr/May - long-lasting snow cover - high albedo:<br />
Limitation of *short-wave radiation<br />
Dominant component: energy consumed by melting snow<br />
Albedo change by snow melt is of critical importance for annual SEB<br />
Marking transition point between two fundamentally different regimes<br />
During polar day - Jul/Aug - snow-free period - system governed by<br />
*short-wave radiation<br />
Main balancing factors in the surface energy budget<br />
*turbulent heat fluxes and *IR-radiation balance<br />
Johannes Lüers<br />
DACH 2010 Bonn<br />
Universität Bayreuth Bayreuther Zentrum für Ökologie und Umweltforschung<br />
Abteilung Mikrometeorologie johannes.lueers@uni-bayreuth.de
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