j. helmert, h. asensio, g. vogel land-surface model calibration: results from global and...
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![Page 1: J. Helmert, H. Asensio, G. Vogel Land-surface model calibration: Results from global and limited-area numerical experiments](https://reader037.vdocument.in/reader037/viewer/2022110403/56649e605503460f94b5a498/html5/thumbnails/1.jpg)
J. Helmert, H. Asensio, G. Vogel
Land-surface model calibration:
Results from global and limited-area numerical experiments
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J. Helmert, H. Asensio, G. Vogel
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• 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
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Verification 7224
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Verification 7224
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• 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
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• 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
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BATS Plant transpiration (Dickinson, 1984)
rstom stomatal resistancerlc res. btw. leaves and canopy airrca res. btw. canopy air and atm. level
rstom
LAIE
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Verification 7533
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Verification 7533
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ROUTI
Soil moisture analysis
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EXP
Soil moisture analysis
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2m - Temperature
7224 7533
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7224
2m – Dewpoint Temperature
75337224
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Sensible Heat Flux
7224 7533
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Latent Heat Flux
7224 7533
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Soil Moisture 18cm
7224
7533
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Soil Moisture 54cm
7224
7533
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• 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
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Global experiments onthe impact of the minimum stomatal
resistance
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PRS_MIN/LAI_MX ROUTI 1999-2007PRS_MIN = 150 s/m
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PRS_MIN/LAI June ROUTI 2007-
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PRS_MIN/LAI June EXP Masson (2003) - Ecoclimap
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PRS_MIN/LAI June EXP Dorman and Sellers (1989)
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Global Verification
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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
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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
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Vegetation albedo
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BSvegveg )1(15.0
Albedo (snow free):
Vegetation albedo ROUTI
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EXP 7750Masson (2003) - Ecoclimap
BS
D
E
veg
ff
fveg
)1(
)2.0)1(15.0
1.0(
Albedo (snow free):
Vegetation albedo EXP
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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
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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
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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
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• 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
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BSvegveg )1(15.0
Albedo (snow free):
Vegetation albedo ROUTI
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20100708 12:00 MSG
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EXP Masson (2003) - Ecoclimap
BS
D
E
veg
ff
fveg
)1(
)2.0)1(15.0
1.0(
Albedo (snow free):
Vegetation albedo EXP
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Meteosat MSG 2009061312
Case study 20090613
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COSMO-DE
Case study 20090613
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Albedo Masson (2003) - Ecoclimap
Case study 20090613
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COSMO-DE ROUTI
Case study 20090613
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COSMO-DE ROUTI ALBEDO MASSON
Case study 20090613
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• 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