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| Titel |
An integrated model of soil-canopy spectral radiances, photosynthesis, fluorescence, temperature and energy balance |
| VerfasserIn |
C. Tol, W. Verhoef, J. Timmermans, A. Verhoef, Z. Su |
| 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 ; 6, no. 12 ; Nr. 6, no. 12 (2009-12-18), S.3109-3129 |
| Datensatznummer |
250004234
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| Publikation (Nr.) |
 copernicus.org/bg-6-3109-2009.pdf |
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| Zusammenfassung |
| This paper presents the model SCOPE (Soil Canopy Observation, Photochemistry
and Energy fluxes), which is a vertical (1-D) integrated radiative transfer
and energy balance model. The model links visible to thermal infrared
radiance spectra (0.4 to 50 μm) as observed above the canopy to the
fluxes of water, heat and carbon dioxide, as a function of vegetation
structure, and the vertical profiles of temperature. Output of the model is
the spectrum of outgoing radiation in the viewing direction and the turbulent
heat fluxes, photosynthesis and chlorophyll fluorescence. A special routine
is dedicated to the calculation of photosynthesis rate and chlorophyll
fluorescence at the leaf level as a function of net radiation and leaf
temperature. The fluorescence contributions from individual leaves are
integrated over the canopy layer to calculate top-of-canopy fluorescence. The
calculation of radiative transfer and the energy balance is fully integrated,
allowing for feedback between leaf temperatures, leaf chlorophyll
fluorescence and radiative fluxes. Leaf temperatures are calculated on the
basis of energy balance closure. Model simulations were evaluated against
observations reported in the literature and against data collected during
field campaigns. These evaluations showed that SCOPE is able to reproduce
realistic radiance spectra, directional radiance and energy balance fluxes.
The model may be applied for the design of algorithms for the retrieval of
evapotranspiration from optical and thermal earth observation data, for
validation of existing methods to monitor vegetation functioning, to help
interpret canopy fluorescence measurements, and to study the relationships
between synoptic observations with diurnally integrated quantities. The model
has been implemented in Matlab and has a modular design, thus allowing for
great flexibility and scalability. |
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