A R C T E X
A R C T E X
A R C T E X
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DS<br />
-18<br />
DL<br />
+41<br />
Q H<br />
-18<br />
Q E<br />
+0.7<br />
Light Winter<br />
15 Mar<br />
to 15 Apr<br />
DS<br />
-41<br />
DL<br />
+33<br />
Q H<br />
-8<br />
Pre melt 15 Apr<br />
to 31 May<br />
Q E<br />
+2.5<br />
C ~0<br />
Q G<br />
-5.9<br />
Q G<br />
+3<br />
C +10.5<br />
DS<br />
-91<br />
Q G<br />
+12<br />
DL<br />
+43<br />
Q Melt<br />
+27<br />
Snow melt<br />
Jun<br />
Q H<br />
-6<br />
Q E<br />
+11<br />
C +3<br />
Light winter: Net short-wave radiation increasing à limited by high snow albedo.<br />
Energy loss by ∆L compensated by sensible heat flux and short-wave radiation.<br />
Snow heat flux negative à further cooling underlying soil column à lowest soil<br />
temperatures.<br />
Pre melt: Net short-wave radiation dominant energy supply. Sensible heat flux<br />
add. melt energy.<br />
Net long-wave radiation main balancing factor. Latent heat remains insignificant.<br />
Snow and soil column start to warm (now positive snow heat flux).<br />
Snow melt: Warming of snow pack towards 0°C à followed by snow melt.<br />
Energy consumed by melting snow is dominant component.<br />
Strong net short-wave radiation (albedo change) à Compensated by net longwave<br />
radiation.<br />
Total net radiation is much stronger energy suppler compared to Q H .<br />
Snow melt almost entirely controlled by radiation.<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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