HR: 1330h
AN: A32A-0106    [PDF]
TI: Elements of a Process-based Model of Leaf Photosynthesis
AU: Noe, S M
EM: noe@bio.tu-darmstadt.de
AF: Dept. of Biology, Botany, University of Technology Darmstadt, Schnittspahnstr. 3-5, Darmstadt, D-64287 Germany
AU: Giersch, C
EM: giersch@bio.tu-darmstadt.de
AF: Dept. of Biology, Botany, University of Technology Darmstadt, Schnittspahnstr. 3-5, Darmstadt, D-64287 Germany
AU: Schnitzler, J
EM: joerg-peter.schnitzler@imk.fzk.de
AF: Institut fuer Meteorologie und Klimaforschung (IMK-IFU) Forschungszentrum Karlsruhe GmbH, Kreuzeckbahnstr. 19, Garmisch-Partenkirch, D-82467 Germany
AU: * Steinbrecher, R
EM: rainer.steinbrecher@imk.fzk.de
AF: Institut fuer Meteorologie und Klimaforschung (IMK-IFU) Forschungszentrum Karlsruhe GmbH, Kreuzeckbahnstr. 19, Garmisch-Partenkirch, D-82467 Germany
AB: Process-based modelling of photosynthesis requires appropriate description of leaf photosynthesis. Essential aspects are stomatal conductance and the CO$_{2}$ assimilation proper, both as affected by the environment. Here we propose and analyse a photosynthesis model with two variables (stomatal conductance ($g_s$) and the CO$_{2}$ partial pressure inside the leaf ($p_i$)) for the stomatal part and five variables to model the Calvin cycle intermediates. The actual stomatal conductance is calculated via a target function $G(I,\Delta VP)$ which describes the effects of light ($I$) and vapour pressure deficit ($\Delta VP$). CO$_{2}$ fixation is modelled as a sink term for $p_i$ so that a differential equation for $p_i$ is derived which greatly simplifies explicit modelling of the Calvin cycle. A plausibility check of the model employing sinusoidal time courses for $I$ and $\Delta VP$ is carried out. Using field data, the model is shown to produced a reasonable fit to data sets collected for oak leaves. Preliminary modelling results indicate that also the Calvin cycle intermediates and ATP are in acceptable agreement with experimental data. The model is intended to use as a base module of the isoprene emission model (SIM-BIM), which is a subproject of the BEWA2000 project within the national joint research project AFO2000 (Atmosphaeren Forschungsprogramm 2000).
UR: http://imk-ifu.fzk.de/bewa2000/
DE: 1620 Climate dynamics (3309)
DE: 3309 Climatology (1620)
DE: 3337 Numerical modeling and data assimilation
DE: 3367 Theoretical modeling
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting