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J. Helmert, H. Asensio, G. Vogel Land-surface model calibration: Results from global and limited-area numerical experiments.

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Presentation on theme: "J. Helmert, H. Asensio, G. Vogel Land-surface model calibration: Results from global and limited-area numerical experiments."— Presentation transcript:

1 J. Helmert, H. Asensio, G. Vogel Land-surface model calibration: Results from global and limited-area numerical experiments

2 J. Helmert, H. Asensio, G. Vogel

3 Aerosol climatology Emissivity Vegetation climatology (LAI, PLCOV) Minimum stomatal resistance Non-uniform root distribution Ground water with upward diffusion Soil moisture dependent heat conductivity Tested adaptions in int2lm and TERRA EXP 7224

4 Verification 7224

5

6 Result: less evapotranspiration, dry and warm PBL Reason ? : Tested combination of external parameters and TERRA adaptions could lead to increase in PRS/LAI ratio SMA tries to compensate T2M-Bias, wet soil Conclusions of EXP 7224

7 Adaptions in external parameters of COSMO Experiment 7224: aerosol + TERRA adaptions, June 2009 Result: Increase in soil moisture, Bowen ratio, and T2M Experiment 7533: Test of PRS_MIN(x,y) impact EXP 7224 setup with 0.5* PRS_MIN(x,y) Global Tests (GME) with different landuse parameters (look up tables) Status

8 BATS Plant transpiration (Dickinson, 1984) r stom stomatal resistance r lc res. btw. leaves and canopy air r ca res. btw. canopy air and atm. level rstom LAI E

9 Verification 7533

10

11 ROUTI Soil moisture analysis

12 EXP Soil moisture analysis

13 2m - Temperature 7224 7533

14 7224 2m – Dewpoint Temperature 7533 7224

15 Sensible Heat Flux 72247533

16 Latent Heat Flux 72247533

17 Soil Moisture 18cm 7224 7533

18 Soil Moisture 54cm 7224 7533

19 PRS/LAI ratio seems to have an impact on split-up of fluxes Increased evapotranspiration with impact on T_2M and SMA activity Expected decrease of the overestimated soil moisture of EXP 7224 is visible Conclusions of EXP 7533

20 Global experiments on the impact of the minimum stomatal resistance

21 PRS_MIN/LAI_MX ROUTI 1999-2007 PRS_MIN = 150 s/m

22 PRS_MIN/LAI June ROUTI 2007-

23 PRS_MIN/LAI June EXP Masson (2003) - Ecoclimap

24 PRS_MIN/LAI June EXP Dorman and Sellers (1989)

25 Global Verification

26 Europe East Sibiria SK: 2.00SK: -5.08SK: -3.30 SK: -9.72SK: -6.31 SK: 0.88 North America SK: -5.43 SK: -8.23 SK: -3.80 EXP 7601 ECOCLIMAP 01.06.2009-01.07.2009 00 UTC i192f Tropics Africa SK: 2.73 SK: 3.07 SK: 1.22 Tropics America SK: 4.49SK: 3.86SK: 0.09 Global Verification

27 Europe East Sibiria North America EXP 7602 D&S89 01.06.2009-01.07.2009 00 UTC i192f Tropics Africa Tropics America SK: -1.88SK: -4.00SK: 1.83 SK: -7.35SK: -5.87SK: -3.14 Global Verification SK: -3.75SK: -4.81 SK: -3.55 SK: 2.23 SK: 3.23 SK: 0.18 SK: 4.57SK: 4.54SK: 0.02

28 Vegetation albedo

29 Albedo (snow free): Vegetation albedo ROUTI

30 EXP 7750 Masson (2003) - Ecoclimap Albedo (snow free): Vegetation albedo EXP

31 Albedo (snow free): Mean diffuse bihemispherical (white sky) albedo values of 12-27 July for latitude belts: (c), (d) grassland, and (e), (f) mixed forest from (left) the 5-yr aggregate climatology and (right) the 2002 single-year albedo data. Moody et al., 2008 Vegetation albedo

32 Europe East Sibiria SK: 2.00SK: -5.08SK: -3.30 SK: -9.72SK: -6.31 SK: 0.88 North America SK: -5.43 SK: -8.23 SK: -3.80 EXP 7601 ECOCLIMAP 01.06.2009-01.07.2009 00 UTC i192f Tropics Africa SK: 2.73 SK: 3.07 SK: 1.22 Tropics America SK: 4.49 SK: 3.86 SK: 0.09 Global Verification

33 Europe East Sibiria North America EXP 7750 ECOCLIMAP+ALBEDO 02.06.2009-01.07.2009 00 UTC i192f Tropics Africa Tropics America Global Verification SK: -6.03SK: -5.68SK: 1.02 SK: -11.7SK: -6.36SK: -0.79 SK: -8.00SK: -9.8SK: -4.56 SK: 1.99 SK: 2.62 SK: 0.37 SK: 3.64 SK: 5.78SK: 0.78

34 PRS/LAI ratio and vegetation type albedo have strong impact on the split-up of fluxes Positive impact on T_2M and TD_2M in temperate zones Neutral or small negative impact in tropics Conclusions of EXP 7750

35 Albedo (snow free): Vegetation albedo ROUTI

36 20100708 12:00 MSG

37 EXP Masson (2003) - Ecoclimap Albedo (snow free): Vegetation albedo EXP

38 Meteosat MSG 2009061312 Case study 20090613

39 COSMO-DE Case study 20090613

40 Albedo Masson (2003) - Ecoclimap Case study 20090613

41 COSMO-DE ROUTI Case study 20090613

42 COSMO-DE ROUTI ALBEDO MASSON Case study 20090613

43 COSMO-DE shows warm T2M bias in summer Critical for introduction of aerosol climatology Vegetation albedo corrects T2M bias to some extent Further tests in COSMO-DE L65 experiments required to access the impact on regional scale Calibrated look-up tables for global and regional NWP application Conclusions and Outlook

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