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Comparing global models of terrestrial net primary productivity (NPP): overview and key results

Authors

  • W. Cramer,

    1. Potsdam Institut für Klimafolgenforschung e.V. (PIK), Postfach 60 12 03, Telegrafenberg, D-14412 Potsdam, Germany,
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  • D. W. Kicklighter,

    1. The Ecosystems Center, Marine Biological Laboratory (MBL), Woods Hole, MA 02543, USA,
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  • A. Bondeau,

    1. Potsdam Institut für Klimafolgenforschung e.V. (PIK), Postfach 60 12 03, Telegrafenberg, D-14412 Potsdam, Germany,
    2. Previous name: A. Fischer.
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  • B. Moore Iii,

    1. Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Morse Hall, Durham, NH 03824, USA,
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  • G. Churkina,

    1. School of Forestry, University of Montana, Missoula, MT 59812, USA,
    2. Present address: Lehrstuhl für Pflanzenökologie, Universität Bayreuth, D-95440 Bayreuth, Germany,
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  • B. Nemry,

    1. Laboratoire de Physique Atmosphérique et Planétaire (LPAP), Institut d’Astrophysique et de Géophysique, Université de Liège, B-4020 Liège, Belgium,
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  • A. Ruimy,

    1. Laboratoire d’Ecophysiologie Végétale, Bâtiment 362, Université Paris-Sud, F-91405 Orsay Cedex, France
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  • A. L. Schloss,

    1. Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Morse Hall, Durham, NH 03824, USA,
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  • ThE. Participants OF. ThE. Potsdam NpP. Model Intercomparison

    1. The following participated in the Potsdam NPP Model Intercomparison: A. Bondeau (previous name: A. Fischer), G. Churkina, W. Cramer, G. Colinet, J. Collatz, G. Dedieu, W. Emanuel, G. Esser, C. Field, L. Franc˛ois, A. Friend, A. Haxeltine, M. Heimann, J. Hoffstadt, J. Kaduk, L. Kergoat, D. W. Kicklighter, W. Knorr, G. Kohlmaier, B. Lurin, P. Maisongrande, P. Martin, R. McKeown, B. Meeson, B. Moore III, R. Nemani, B. Nemry, R. Olson, R. Otto, W. Parton, M. Plöchl, S. Prince, J. Randerson, I. Rasool, B. Rizzo, A. Ruimy, S. Running, D. Sahagian, B. Saugier, A. L. Schloss, J. Scurlock, W. Steffen, P. Warnant, and U. Wittenberg
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Professor W. Cramer, fax: + 49–331–288–2600, E-mail: Wolfgang.Cramer@pik-potsdam.de

Summary

Seventeen global models of terrestrial biogeochemistry were compared with respect to annual and seasonal fluxes of net primary productivity (NPP) for the land biosphere. The comparison, sponsored by IGBP-GAIM/DIS/GCTE, used standardized input variables wherever possible and was carried out through two international workshops and over the Internet. The models differed widely in complexity and original purpose, but could be grouped in three major categories: satellite-based models that use data from the NOAA/AVHRR sensor as their major input stream (CASA, GLO-PEM, SDBM, SIB2 and TURC), models that simulate carbon fluxes using a prescribed vegetation structure (BIOME-BGC, CARAIB 2.1, CENTURY 4.0, FBM 2.2, HRBM 3.0, KGBM, PLAI 0.2, SILVAN 2.2 and TEM 4.0), and models that simulate both vegetation structure and carbon fluxes (BIOME3, DOLY and HYBRID 3.0). The simulations resulted in a range of total NPP values (44.4–66.3 Pg C year–1), after removal of two outliers (which produced extreme results as artefacts due to the comparison). The broad global pattern of NPP and the relationship of annual NPP to the major climatic variables coincided in most areas. Differences could not be attributed to the fundamental modelling strategies, with the exception that nutrient constraints generally produced lower NPP. Regional and global NPP were sensitive to the simulation method for the water balance. Seasonal variation among models was high, both globally and locally, providing several indications for specific deficiencies in some models.

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