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

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)

rstom stomatal resistancerlc res. btw. leaves and canopy airrca res. btw. canopy air and atm. level

rstom

LAIE

Verification 7533

Verification 7533

ROUTI

Soil moisture analysis

EXP

Soil moisture analysis

2m - Temperature

7224 7533

7224

2m – Dewpoint Temperature

75337224

Sensible Heat Flux

7224 7533

Latent Heat Flux

7224 7533

Soil Moisture 18cm

7224

7533

Soil Moisture 54cm

7224

7533

• 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 onthe impact of the minimum stomatal

resistance

PRS_MIN/LAI_MX ROUTI 1999-2007PRS_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: -3.30

SK: -9.72 SK: -6.31 SK: 0.88

North AmericaSK: -5.43

SK: -8.23 SK: -3.80

EXP 7601 ECOCLIMAP 01.06.2009-01.07.2009 00 UTC i192f

Tropics AfricaSK: 2.73

SK: 3.07

SK: 1.22

Tropics AmericaSK: 4.49 SK: 3.86 SK: 0.09

Global Verification

Europe

East Sibiria

North America

EXP 7602 D&S89 01.06.2009-01.07.2009 00 UTC i192f

Tropics Africa

Tropics America

SK: -1.88 SK: -4.00 SK: 1.83

SK: -7.35 SK: -5.87 SK: -3.14

Global Verification

SK: -3.75 SK: -4.81

SK: -3.55

SK: 2.23

SK: 3.23

SK: 0.18

SK: 4.57 SK: 4.54 SK: 0.02

Vegetation albedo

BSvegveg )1(15.0

Albedo (snow free):

Vegetation albedo ROUTI

EXP 7750Masson (2003) - Ecoclimap

BS

D

E

veg

ff

fveg

)1(

)2.0)1(15.0

1.0(

Albedo (snow free):

Vegetation albedo EXP

BS

D

E

veg

ff

fveg

)1(

)2.0)1(15.0

1.0(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

Europe

East Sibiria

SK: 2.00SK: -5.08SK: -3.30

SK: -9.72 SK: -6.31 SK: 0.88

North AmericaSK: -5.43

SK: -8.23 SK: -3.80

EXP 7601 ECOCLIMAP 01.06.2009-01.07.2009 00 UTC i192f

Tropics AfricaSK: 2.73

SK: 3.07

SK: 1.22

Tropics AmericaSK: 4.49 SK: 3.86 SK: 0.09

Global Verification

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: -5.68 SK: 1.02

SK: -11.7 SK: -6.36 SK: -0.79

SK: -8.00 SK: -9.8 SK: -4.56

SK: 1.99

SK: 2.62

SK: 0.37

SK: 3.64 SK: 5.78 SK: 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

BSvegveg )1(15.0

Albedo (snow free):

Vegetation albedo ROUTI

20100708 12:00 MSG

EXP Masson (2003) - Ecoclimap

BS

D

E

veg

ff

fveg

)1(

)2.0)1(15.0

1.0(

Albedo (snow free):

Vegetation albedo EXP

Meteosat MSG 2009061312

Case study 20090613

COSMO-DE

Case study 20090613

Albedo Masson (2003) - Ecoclimap

Case study 20090613

COSMO-DE ROUTI

Case study 20090613

COSMO-DE ROUTI ALBEDO MASSON

Case study 20090613

• 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