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

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Presentation transcript:

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

J. Helmert, H. Asensio, G. Vogel

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

Verification 7224

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

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

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

Verification 7533

ROUTI Soil moisture analysis

EXP Soil moisture analysis

2m - Temperature

7224 2m – Dewpoint Temperature

Sensible Heat Flux

Latent Heat Flux

Soil Moisture 18cm

Soil Moisture 54cm

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

Global experiments on the impact of the minimum stomatal resistance

PRS_MIN/LAI_MX ROUTI PRS_MIN = 150 s/m

PRS_MIN/LAI June ROUTI 2007-

PRS_MIN/LAI June EXP Masson (2003) - Ecoclimap

PRS_MIN/LAI June EXP Dorman and Sellers (1989)

Global Verification

Europe East Sibiria SK: 2.00SK: -5.08SK: SK: -9.72SK: SK: 0.88 North America SK: SK: SK: EXP 7601 ECOCLIMAP UTC i192f Tropics Africa SK: 2.73 SK: 3.07 SK: 1.22 Tropics America SK: 4.49SK: 3.86SK: 0.09 Global Verification

Europe East Sibiria North America EXP 7602 D&S UTC i192f Tropics Africa Tropics America SK: -1.88SK: -4.00SK: 1.83 SK: -7.35SK: -5.87SK: Global Verification SK: -3.75SK: SK: SK: 2.23 SK: 3.23 SK: 0.18 SK: 4.57SK: 4.54SK: 0.02

Vegetation albedo

Albedo (snow free): Vegetation albedo ROUTI

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

Albedo (snow free): Mean diffuse bihemispherical (white sky) albedo values of 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

Europe East Sibiria SK: 2.00SK: -5.08SK: SK: -9.72SK: SK: 0.88 North America SK: SK: SK: EXP 7601 ECOCLIMAP 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

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

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

Albedo (snow free): Vegetation albedo ROUTI

:00 MSG

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

Meteosat MSG Case study

COSMO-DE Case study

Albedo Masson (2003) - Ecoclimap Case study

COSMO-DE ROUTI Case study

COSMO-DE ROUTI ALBEDO MASSON Case study

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