A R C T E X
A R C T E X
A R C T E X
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Ratio of buoyancy / shear production - Free Convection conditions<br />
Ny-Alesund<br />
May 2006<br />
Ratio Buoyancy/Shear [ ]<br />
12<br />
9<br />
6<br />
3<br />
0<br />
-3<br />
-6<br />
-9<br />
+1 or -3<br />
Ratio B/S<br />
12<br />
9<br />
6<br />
3<br />
0<br />
-3<br />
-6<br />
-9<br />
-12<br />
07 08 09 10 11 12 13 14 15 16 17 18 19 20<br />
Determination if a free convection event or extreme stability (Stull 2000)<br />
B/S threshold of -3 buoyancy is three times greater than wind shear |B| > 3⋅|S|<br />
high possibility to generate free convection.<br />
B/S threshold of +1<br />
Time [Day]<br />
states dynamical stable, wave motion drive conditions.<br />
Most of the time in May 2006 relation thermal vs. mechanical produced TKE is near zero.<br />
Distinct, short periods of free convection or extreme stability (duration only 1 h to 2 h).<br />
Events at Ny-Ålesund appear mostly around noon or afternoon.<br />
-12<br />
Johannes Lüers<br />
DACH 2010 Bonn<br />
Universität Bayreuth Bayreuther Zentrum für Ökologie und Umweltforschung<br />
Abteilung Mikrometeorologie johannes.lueers@uni-bayreuth.de<br />
10
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