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| Titel |
Technical Note: The Simple Diagnostic Photosynthesis and Respiration Model (SDPRM) |
| VerfasserIn |
B. Badawy, C. Rödenbeck, M. Reichstein, N. Carvalhais, M. Heimann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 10 ; Nr. 10, no. 10 (2013-10-11), S.6485-6508 |
| Datensatznummer |
250085363
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| Publikation (Nr.) |
 copernicus.org/bg-10-6485-2013.pdf |
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| Zusammenfassung |
| We present a Simple Diagnostic Photosynthesis and Respiration Model (SDPRM)
that has been developed based on pre-existing formulations. The
photosynthesis model is based on the light use efficiency logic for
calculating the gross primary production (GPP), while the ecosystem
respiration (Reco) is a modified version of an Arrhenius-type equation.
SDPRM is driven by satellite-derived fAPAR (fraction of Absorbed
Photosynthetically Active Radiation) and climate data from the National Center for Environmental
Prediction/National Center for Atmospheric Research Reanalysis (NCEP/NCAR). The
model estimates 3-hourly values of GPP for seven major biomes and daily
Reco. The motivation is to provide a priori fields of surface CO2
fluxes with fine temporal and spatial scales for atmospheric CO2
inversions. The estimated fluxes from SDPRM showed that the model is capable
of producing flux estimates consistent with the ones inferred from
atmospheric CO2 inversion or simulated from process-based models. In this
Technical Note, different analyses were carried out to test the sensitivity
of the estimated fluxes of GPP and CO2 to their driving forces. The
spatial patterns of the climatic controls (temperature, precipitation, water)
on the interannual variability of GPP are consistent with previous studies,
even though SDPRM has a very simple structure and few adjustable parameters
and hence it is much easier to modify in an inversion than more sophisticated
process-based models. In SDPRM, temperature is a limiting factor for the
interannual variability of Reco over cold boreal forest, while
precipitation is the main limiting factor of Reco over the tropics and the
southern hemisphere, consistent with previous regional studies. |
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