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

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Thum , T , Zaehle , S , Köhler , P , Aalto , T , Aurela , M , Guanter , L , Kolari , P , Laurila , T , Lohila , A , Magnani , F , Van der Tol , C & Markkanen , T 2017 , ' Modelling sun-induced fluorescence and photosynthesis with a land surface model at local and regional scales in northern Europe ' , Biogeosciences , vol. 14 , no. 7 , pp. 1969-1987 . https://doi.org/10.5194/bg-14-1969-2017

Title: Modelling sun-induced fluorescence and photosynthesis with a land surface model at local and regional scales in northern Europe
Author: Thum, Tea; Zaehle, Sönke; Köhler, Philipp; Aalto, Tuula; Aurela, Mika; Guanter, Luis; Kolari, Pasi; Laurila, Tuomas; Lohila, Annalea; Magnani, Federico; Van der Tol, Christiaan; Markkanen, Tiina
Contributor: University of Helsinki, Department of Physics
Date: 2017-04-11
Language: eng
Number of pages: 19
Belongs to series: Biogeosciences
ISSN: 1726-4170
URI: http://hdl.handle.net/10138/183968
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 Hyytiala, 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 r(2) of 0.86. The GOME-2-based SIF was a better proxy for GPP than the remotely sensed fA-PAR (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.
Subject: TERRESTRIAL CHLOROPHYLL FLUORESCENCE
BOREAL CONIFEROUS FOREST
DATA ASSIMILATION SYSTEM
SCOTS PINE FOREST
EDDY COVARIANCE
FLUX MEASUREMENTS
CO2 EXCHANGE
BIOCHEMICAL-MODEL
ENERGY-BALANCE
PHOTOSYSTEM-II
114 Physical sciences
4112 Forestry
1172 Environmental sciences
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