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  Towards operational remote sensing of forest carbon balance across Northern Europe

Olofsson, P., Lagergren, F., Lindroth, A., Lindstrom, J., Klemedtsson, L., Kutsch, W. L., et al. (2008). Towards operational remote sensing of forest carbon balance across Northern Europe. Biogeosciences, 5(3), 817-832. doi:10.5194/bg-5-817-2008.

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 Urheber:
Olofsson, P., Autor
Lagergren, F., Autor
Lindroth, A., Autor
Lindstrom, J., Autor
Klemedtsson, L., Autor
Kutsch, W. L.1, Autor           
Eklundh, L., Autor
Affiliations:
1Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497751              

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Schlagwörter: Gross primary production Light-use efficiency Net ecosystem exchange Modis atmosphere products Long-term measurements Satellite sensor data Kuparuk river-basin Leaf-area index Vegetation indexes Absorbed par
 Zusammenfassung: Monthly averages of ecosystem respiration ( ER), gross primary production (GPP) and net ecosystem exchange ( NEE) over Scandinavian forest sites were estimated using regression models driven by air temperature ( AT), absorbed photosynthetically active radiation (APAR) and vegetation indices. The models were constructed and evaluated using satellite data from Terra/MODIS and measured data collected at seven flux tower sites in northern Europe. Data used for model construction was excluded from the evaluation. Relationships between ground measured variables and the independent variables were investigated. It was found that the enhanced vegetation index (EVI) at 250m resolution was highly noisy for the coniferous sites, and hence, 1 km EVI was used for the analysis. Linear relationships between EVI and the biophysical variables were found: correlation coefficients between EVI and GPP, NEE, and AT ranged from 0.90 to 0.79 for the deciduous data, and from 0.85 to 0.67 for the coniferous data. Due to saturation, there were no linear relationships between normalized difference vegetation index (NDVI) and the ground measured parameters found at any site. APAR correlated better with the parameters in question than the vegetation indices. Modeled GPP and ER were in good agreement with measured values, with more than 90% of the variation in measured GPP and ER being explained by the coniferous models. The site-specific respiration rate at 10 degrees C (R-10) was needed for describing the ER variation between sites. Even though monthly NEE was modeled with less accuracy than GPP, 61% and 75% (dec. and con., respectively) of the variation in the measured time series was explained by the model. These results are important for moving towards operational remote sensing of forest carbon balance across Northern Europe. [References: 67]

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 Datum: 2008
 Publikationsstatus: Erschienen
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 Identifikatoren: Anderer: BGC1139
DOI: 10.5194/bg-5-817-2008
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Titel: Biogeosciences
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Katlenburg-Lindau, Germany : Copernicus GmbH on behalf of the European Geosciences Union
Seiten: - Band / Heft: 5 (3) Artikelnummer: - Start- / Endseite: 817 - 832 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/111087929276006
ISSN: 1726-4170