1. General Model Information

Name: Microweather94

Acronym: MICROWEATHER94


Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: not specified
Main application:
Keywords: weather, crop canopy microclimate, soil energy contents, energy balance, evapotranspiration, carbon exchange

Contact:

Prof.dr.ir. J. Goudriaan
Wageningen Agricultural University
Dept. Theoretical Production Ecology
P.O.Box 430
6700 AK Wageningen
THE NETHERLANDS
Phone: +31.8370.83987
Fax : +31.8370.84892
email: jan.goudriaan@staff.tpe.wau.nl>

Author(s):

Abstract:

With the observed weather at 2 or 10 m height as input, the crop canopy microclimate is simulated, including the soil. The energy balance, evapotranspiration and carbon exchange is calculated. In-canopy profiles of radiation and windspeed are calculated, with their effects on leaf temperatures. An in-canopy profile of air temperature and humidity is ignored, because the K-theory has been proven not to be valid. There is however, an offset with respect to the above-canopy temperature and humidity. The soil energy balance is included, down to 1 meter depth.

Author of the abstract:
CAMASE Register of Agro-ecosystems Models


II. Technical Information

II.1 Executables:

Operating System(s): MS-DOS or Macintosh Executables can be obtained from the author jan.goudriaan@staff.tpe.wau.nl> without charge, but under some conditions.

II.2 Source-code:

Programming Language(s): FORTRAN The source code can be obtained from the author jan.goudriaan@staff.tpe.wau.nl without charge, but under some conditions.

II.3 Manuals:



II.4 Data:



III. Mathematical Information


III.1 Mathematics

Rate variables: Fluxes of transpiration (latent heat loss), sensible heat loss, carbon dioxide

III.2 Quantities

Rate variables: Fluxes of transpiration (latent heat loss), sensible heat loss, carbon dioxideassimilation, soil surface fluxes, in-soil fluxes of heat, radiation short-wave and long-wavetransmitted and reflected.
4Number of rate variables: About 100.
State variables: Soil energy contents. Leaf and air conditions are instantaneously calculated.
Number of state variables: About 30.
Above canopy climate, soil properties, vegetation properties.

III.2.1 Input

Above canopy climate, soil properties, vegetation properties. See state and rate variables.

III.2.2 Output

See state and rate variables.
Time interval of simulation: 1 hour, or less. Basic spatial unit: plot, 1 m2.


IV. References

Goudriaan, J., 1977.Crop micrometeorology: a simulation study. Dr.Landbouwwetenschappen: Dissertatie LH-683: Landbouwhogeschool Wageningen. Pudoc, 249 pp.



V. Further information in the World-Wide-Web


VI. Additional remarks


Last review of this document by: T. Gabele: 21. 07. 1997 -
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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