Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 2 2009 10.5194/bg-6-225-2009 http://www.biogeosciences.net/6/225/2009/ http://www.biogeosciences.net/6/225/2009/bg-6-225-2009.html http://www.biogeosciences.net/6/225/2009/bg-6-225-2009.pdf 225 234 2009-02-19 Using MODIS derived fPAR with ground based flux tower measurements to derive the light use efficiency for two Canadian peatlands J. Connolly john.connolly0@ucd.ie N. T. Roulet J. W. Seaquist N. M. Holden P. M. Lafleur E. R. Humphreys B. W. Heumann S. M. Ward Biosystems Engineering, UCD School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Dublin, Ireland Department of Geography and Global Environmental and Climate Change Centre (GEC3), McGill University, Montreal, Quebec, Canada Department of Physical Geography and Ecosystems Analysis, Sölvegatan 12, 223 62 Lund, Sweden Department of Geography, Trent University, Peterborough, Ontario, Canada Department of Geography, Carleton University, Ottawa, Ontario, Canada Department of Geography, Carolina Population Center, University of North Carolina at Chapel Hill, USA We used satellite remote sensing data; fraction of photosynthetically active radiation absorbed by vegetation (fPAR) from the Moderate Resolution Imaging Spectroradiometer (MODIS) in combination with tower eddy covariance and meteorological measurements to characterise the Light Use Efficiency parameter (ε) variability and the maximum ε (εmax) for two contrasting Canadian peatlands. Eight-day MODIS fPAR data were acquired for the Mer Bleue (2000 to 2003) and Western Peatland (2004). Flux tower eddy covariance and meteorological measurements were integrated to the same eight-day time stamps as the MODIS fPAR data. A light use efficiency model: GPP = ε×APAR (where GPP is Gross Primary Productivity and APAR is absorbed photosynthetically active radiation) was used to calculate ε. The εmax value for each year (2000 to 2003) at the Mer Bleue bog ranged from 0.58 g C MJ−1 to 0.78 g C MJ−1 and was 0.91 g C MJ−1 in 2004, for the Western Peatland. The average growing season ε for the Mer Bleue bog for the four year period was 0.35 g C MJ−1 and for the Western Peatland in 2004 was 0.57 g C MJ−1. The average snow free period for the Mer Bleue bog over the four years was 0.27 g C MJ−1 and for the Western Peatland in 2004 was 0.39 g C MJ−1. Using the light use efficiency method we calculated the εmax and the annual variability in ε for two Canadian peatlands. 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