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Enhancement of the single layer snow model in TERRA: Global numerical experiments J. Helmert, G. Zängl, M. Raschendorfer, D. Mironov, H. Frank, B. Ritter.

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Presentation on theme: "Enhancement of the single layer snow model in TERRA: Global numerical experiments J. Helmert, G. Zängl, M. Raschendorfer, D. Mironov, H. Frank, B. Ritter."— Presentation transcript:

1 Enhancement of the single layer snow model in TERRA: Global numerical experiments
J. Helmert, G. Zängl, M. Raschendorfer, D. Mironov, H. Frank, B. Ritter

2 Outline Computing the snow density Snow depth, snow heat conductivity
Scalar roughness length over snow Global numerical experiments

3 Single layer snow model

4 Snow depth, heat conductivity, snow density:
Routine Snow depth, heat conductivity, snow density:

5 Snow density: Experiment

6 Case study: Snow storm „Daisy“
January 2010 PEPS Pictures from Tagesschau.de

7 Experiment: Daisy 2010010800 96h GME

8 Experiment: Daisy 2010010800 96h GME

9 Experiment: Daisy 2010010800 96h GME

10 Fresh snow

11 Snow depth

12 Snow density

13 ROUTI - EXP

14 ROUTI - EXP

15 Scalar roughness length over snow
Surface Heat Budget of the Arctic Ocean (SHEBA) field experiment Baltimore site with ridge in background. The main camp for the SHEBA project was based around the CCG Ice Breaker DeGroseilliers

16 Scalar roughness length over snow
Experiment: additional variable for z0t: gz0s: Minimum: zT= 1.E-4 m GME Exp Andreas et al., 2004 Ice station Weddel

17 Scalar roughness length over snow: SURFEX
Example: SWE=40mm, SWEmin=10mm beta_s=0.408s^2/m z0=10cm f_s=0.09 z0t=9.1cm

18 Experiment 7667 Computing the adapted snow density with implications for snow depth, snow heat conductivity Scalar roughness length over snow Winter 2009/2010; first month: December 2009

19 Verification T850 BIAS

20 Verification G500 ANOC

21 Verification

22 Global Verification EXP 7667 SNOW 02.12.2009-31.12.2009 00 UTC i192f
T_2M TDD_2M P_SURF SK: 2.37 SK: -0.57 SK: -0.39 Europe SK: -4.21 SK: -1.88 SK: -0.27 East Sibiria SK: -4.03 North-West Sibiria SK: 0.45 SK: -3.82 SK: -4.74 South-West Sibiria SK: -2.74 SK: -0.14 SK: 1.32 SK: 0.22 SK: 0.69 North America

23 Conclusions Routine snow density formulation leads to underestimation of snow depth, overestimation of snow heat conductivity Revised formulation could alleviate to a certain degree this problem Introduction of scalar roughness length over snow accounts for decrease in roughness length with increasing grid point snow amount Verification of EXP7667 for December 2009 shows positive impact of model changes for regions with warm 2m-temperature bias

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