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  Modelling sun-induced fluorescence and photosynthesis with a land surface model at local and regional scales in northern Europe

Thum, T., Zaehle, S., Köhler, P., Aalto, T., Aurela, M., Guanter, L., et al. (2017). Modelling sun-induced fluorescence and photosynthesis with a land surface model at local and regional scales in northern Europe. Biogeosciences, 14(7), 1969-1987. doi:10.5194/bg-14-1969-2017.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-0885-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-7D42-C
Genre: Journal Article

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http://dx.doi.org/10.5194/bg-14-1969-2017 (Publisher version)
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 Creators:
Thum, Tea1, Author              
Zaehle, Sönke1, 2, Author              
Köhler, Philipp, Author
Aalto, Tuula, Author
Aurela, Mika, Author
Guanter, Luis, Author
Kolari, Pasi, Author
Laurila, Tuomas, Author
Lohila, Annalea, Author
Magnani, Federico, Author
Tol, Christiaan Van Der, Author
Markkanen, Tiina, Author
Affiliations:
1Terrestrial Biosphere Modelling, Dr. Sönke Zähle, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1938309              
2Terrestrial Biosphere Modelling, Dr. Sönke Zähle, Department Biogeochemical Integration, Prof. Dr. Martin Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497787              

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 Abstract: Recent satellite observations of sun-induced chlorophyll fluorescence (SIF) are thought to provide a large-scale proxy for gross primary production (GPP), thus providing a new way to assess the performance of land surface models (LSMs). In this study, we assessed how well SIF is able to predict GPP in the Fenno-Scandinavian region and what potential limitations for its application exist. We implemented a SIF model into the JSBACH LSM and used active leaf-level chlorophyll fluorescence measurements (Chl F) to evaluate the performance of the SIF module at a coniferous forest at Hyytiälä, Finland. We also compared simulated GPP and SIF at four Finnish micrometeorological flux measurement sites to observed GPP as well as to satellite-observed SIF. Finally, we conducted a regional model simulation for the Fenno-Scandinavian region with JSBACH and compared the results to SIF retrievals from the GOME-2 (Global Ozone Monitoring Experiment-2) space-borne spectrometer and to observation-based regional GPP estimates. Both observations and simulations revealed that SIF can be used to estimate GPP at both site and regional scales. At regional scale the model was able to simulate observed SIF averaged over 5 years with r2 of 0.86. The GOME-2-based SIF was a better proxy for GPP than the remotely sensed fAPAR (fraction of absorbed photosynthetic active radiation by vegetation). The observed SIF captured the seasonality of the photosynthesis at site scale and showed feasibility for use in improving of model seasonality at site and regional scale.

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 Dates: 2017-03-092017-04-112017-04
 Publication Status: Published in print
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 Identifiers: Other: BGC2623
DOI: 10.5194/bg-14-1969-2017
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Project name : QUINCY
Grant ID : 647204
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Biogeosciences
  Other : Biogeosciences
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : Copernicus GmbH on behalf of the European Geosciences Union
Pages: - Volume / Issue: 14 (7) Sequence Number: - Start / End Page: 1969 - 1987 Identifier: ISSN: 1726-4170
CoNE: /journals/resource/111087929276006