1. General Model Information

Name: A biosphere model of CO2 fertilization effect

Acronym: TsuBiMo

Main medium: terrestrial
Main subject: biogeochemistry
Organization level:
Type of model: not specified
Main application:
Keywords: CO2, productivity, biosphere



NIES, Onogawa 16-2, Tsukuba, Ibaraki 305, Japan
email: g.alexandrov@nies.go.jp


Georgii Alexandrov and Takehisa Oikawa


The stimulation of photosynthesis at higher CO2 concentration is the fact repeatedly observed in case of short-term experiment at a single leaf level. We scaled up from leaf to globe and come to conclusion that CO2-induced increase in the terrestrial Net Primary Production (NPP) may be described by the same simple formula that was heavily used over last two decades: NPP(Ca)=NPP0*[1+b*ln(Ca/Co)], where Ca is atmospheric CO2 concentration. We also concluded that NPP0=61.6 Pg C/yr and b=0.35 for C0=340 ppmv. Modellers rarely convert their results into simple formulas to avoid the false impression that their conclusions remain valid outside the domain of model settings. To maintain the balance between credibility and usability of our results, we recorded CD-R containing the information about the settings of our model. This CD-R contains the global grid (half to half degree) of NPP produced by our model, the global grids of environmental conditions that determine NPP, and the FORTRAN programs that we used in calc ulations. Proceeding from this, one can repeat our calculation, trace our logic, and if necessary modify our assumptions for making its own judgment from the same data.

II. Technical Information

II.1 Executables:

Operating System(s): PC

II.2 Source-code:

Programming Language(s): FORTRAN TsuBiMo on CD-R

II.3 Manuals:

TsuBiMo on CD-R Yes TsuBiMo on CD-R

II.4 Data:

TsuBiMo on CD-R TsuBiMo on CD-R

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: Mon Aug 24 03:33:33 1998
Status of the document: Contributed by Georgii Alexandrov
last modified by Tobias Gabele Wed Aug 21 21:44:51 CEST 2002

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