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G. Vogel, F. Ament*, C. Heret, U. Rummel. COSMO-EU. COSMO-EU. Vertical profile of specific humidity at MO Lindenberg. June 2006. May 2006. Transition zone (min->max). Transition zone (max->min). Plant cover. Plant cover. Measurement. COSMO-EU. TERRA (stand-alone).

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slide2

COSMO-EU

COSMO-EU

slide5

Transition zone (min->max)

Transition zone (max->min)

Plant cover

Plant cover

Measurement

COSMO-EU

TERRA (stand-alone)

soil moisture (3-9cm) sand

Falkenberg (MOL DWD)

End of snow period

slide6

Solar albedo

Falken-berg 2006

measurement

reference sim.

sim (mod. melting & snow albedo)

Snow height

(6 UTC)

rain

slide7

reference sim.

measurement

sim (mod. melting & snow albedo)

rain

slide8

Modifications to improve the soil moisture simulation with TERRA7 (COSMO-EU)

evaporation of bare soil according to Noilhan et Planton (1989)

infiltration based on hydraulic conductivity*

modified root density function with exponential reduction*

modified transpiration rate of dry leaves*

*adopted from GME

slide11

Improvement of turbulent heat fluxes (Falkenberg)

Sensible heat flux May 2006

Latent heat flux May 2006

Bowen ratio (12UTC): 0.43 1.80 0.60 0.28

slide12

Improvement of turbulent heat fluxes (Forest site)

Latent heat flux May 2006

Sensible heat flux May 2006

(No1D)

COSMO-EU

slide13

CONCLUSIONS

Measurement-driven stand-alone simulations are a useful tool to study the model behaviour of the soil module TERRA in detail. Our valida- tion activities focussed to soil moisture processes as a key factor in near-surface boundary layer modelling.

By introducing some minor modifications the Bowen ratio could be improved in our one-month test data set at the measurement sites Falkenberg (grass) and Kehrigk (coniferous forest). The studies should be extended to several months in the annual cycle.

In order to further improve the turbulent heat fluxes above forested areas the parameterisation of interception should be revised. In par-ticular its quantitative effect on the latent heat flux should be more precisely derived from the measurements.

slide15

Transition zone (min->max)

Transition zone (max->min)

Plant cover

Plant cover

Measurement

COSMO-EU

TERRA (stand-alone)

soil moisture (3-9cm) sand

Falkenberg (MOL DWD)

End of snow period

slide18

Improvement of turbulent heat fluxes (Falkenberg)

Sensible heat flux May 2006

Latent heat flux May 2006

Bowen ratio (12UTC): 0.43 1.80 0.60 0.28

slide19

Improvement of turbulent heat fluxes (Forest site)

Latent heat flux May 2006

Sensible heat flux May 2006

(No1D)

COSMO-EU

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