1. General Model Information

Name: Frankfurt Biosphere Model

Acronym: FBM

Main medium: terrestrial+air
Main subject: biogeochemistry
Organization level: ecosystem, landscape
Type of model: compartment model
Main application:
Keywords: soil vegetation, CO2, uptake of CO2, release of CO2, global,cliía, seasonal, long-term, carbon cycle,


Dr. Matthias K. B. Luedeke
Potsdam Institute for Climate Impact Research
P.O. Box 601203
14412 Potsdam, Germany
Phone: +49-331-288-2552
Fax : +49-331-288-2600
email: luedeke@pik-potsdam.de


Dr. Matthias K. B. Luedeke
Franz-Werner Badeck
Ralf D. Otto
Christof Haeger
Silke Doenges
Juergen Kindermann
Gudrun Wuerth
Torsten Lang
Ulrich Jaekel
Axel Klaudius
Peter Ramge
Stefan Habermehl
Gundolf H. Kohlmaier


contents of the model
FBM is a global model for calculating the seasonal pattern of uptake and release of $CO_2$ by the vegetation and soil in a steady state climate simulation as well as the long term development in a changing environment. Within the terrestrial ecosystems 32 vegetation types are distinguished and combined with 7 distinct soil types with respect to their water holding capacities. Within each vegetation type the living biomass is divided into twocompartments, one with a short (seasonal) turnover containing the photosynthesizing tissue, feeder roots, and assimilate store, and another one with a long turnover mainly consisting of structural plant material.
principles of the model
The mathematical description is based on two hypotheses: 1.\ vegetation tends to maximize photosynthesizing tissue; 2.\ a minimum amount of structural tissue is needed for support and maintain the productive parts, described by an allometric relation. The fluxes are modeled using standard equations for gross photosynthesis of the canopy, autotrophic respiration, and decomposition of dead organic matter depending on surface temperature, soil moisture, and irradiation. Within the system of differential equations the free parameters for each vegetation type are calibrated on the basis of a characteristic seasonal climate.

FBM-Home page

II. Technical Information

II.1 Executables:

Operating System(s):

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

Complete model documentation: Luedeke, M. K. B., F.-W. Badeck, R. D. Otto, Ch. Haeger, S. Doenges,J. Kindermann, G. Wuerth, T. Lang, U. Jaekel, A. Klaudius, P. Ramge, St. Habermehl, G. H. Kohlmaier: the Frankfurt biosphere model: a global process-oriented model for the seasonal and longterm $CO_2$ exchange between terrestrial ecosystems and the atmosphere. Part I: model description and il, Climate Research, 4 (1994), pp. 143-166.

II.4 Data:

III. Mathematical Information

III.1 Mathematics

This is a list of model equations sorted by their characteristics with hypertext links for more details.

III.2 Quantities

This is a list of model quantities sorted by their characteristics with hypertext links for more details.

III.2.1 Input

III.2.2 Output

IV. References

Clapp, R. B., Hornberger, G. M., 1978.
empirical equations for some soil hydraulic properties
Water Resources Research, 14(4), pp. 601-604.


Lüdeke, M. K. B.; Badeck, F.-W.; Otto, R. D.; Häger, C.; Dönges, S.; Kindermann, J.; Würth, G.;Lang, T.; Jäkel, U.; Klaudius, A.; Ramge, P.; Habermehl, S.; Kohlmaier, G. H. (1994). TheFrankfurt Biosphere Model. A Global Process Oriented Model for the Seasonal and LongtermCO2 Exchange between Terrestrial Ecosystems and the Atmosphere. Part 1: Model Descriptionand Illustrating Results for the Vegetation Types Cold Deciduous and Boreal Forests. ClimateResearch 4(2): 143-166.

V. Further information in the World-Wide-Web

VI. Additional remarks

The variable/function $\omega_{RC}$ (allometric relation) is denoted in the original reference as $\Omega$, also $Temp_d$ is denoted originally as $T_d$. These changes in notation are due to technical reasons.

Additional information
Last review of this document by: T. Gabele: 15 .10. 1998
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:42 CEST 2002

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