A R C T E X

More documents

Recommendations

Info

Disturbed temperature profile close to the surface (Lüers & Bareiss, ACP 2010) Mean vertical profile of temperature and wind speed Case A reflects strong surface cooling and a sharp inversion within 1 or 2 meter (5 h to 8 h or 17 to 22 h CET). Case B occurs around noon (9 to 16 CET) indicating a disturbed profile caused by surface warming. Johannes Lüers DACH 2010 Bonn Universität Bayreuth Bayreuther Zentrum für Ökologie und Umweltforschung Abteilung Mikrometeorologie johannes.lueers@uni-bayreuth.de 8
Ratio of buoyancy / shear production - Free Convection conditions Production of Turbulent Kinetic Energy TKE B = g θ v ⋅ w′ θ′ v Buoyancy production: This term represents effect of thermal convection on the generation of TKE. S 2 = u ∗ ⋅ ∆v h ∆z Shear production: This term represents mechanical production of TKE or of turbulent eddies. Interaction of the vertical wind profile with the kinematic stress against the surface. Ratio B/S (B/S = flux Richardson number Ri f ) TKE produced or consumed by the buoyancy term B versus TKE produced by the mechanical or shear stress term S Usable to assess the dynamical stability or the convective activity of the atmospheric boundary layer. Johannes Lüers DACH 2010 Bonn Universität Bayreuth Bayreuther Zentrum für Ökologie und Umweltforschung Abteilung Mikrometeorologie johannes.lueers@uni-bayreuth.de 9
Page 1 and 2: A R C T E X Results of the Arctic T
Page 3 and 4: Direct near surface measurements of
Page 5 and 6: Meso-scale atmospheric circulation
Page 7: z/L z [ ] z/L z [ ] Ny-Alesund 2.0
Page 11 and 12: Surface energy budget of permafrost
Page 13 and 14: Dark Winter Oct to Mar Summer Jul &
Page 15 and 16: Surface energy budget of permafrost
Page 17 and 18: Conclusions : Process understanding
Page 19: Thanks 19

A R C T E X

Create successful ePaper yourself

Delete template?

Save as template?