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    • Rangeland Ecology & Management, Volume 63 (2010)
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    New Parameterization of a Global Vegetation Model for Steppe Ecosystem From Southern Siberian In Situ Measurements

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    Author
    Vuichard, Nicolas
    Ciais, Philippe
    Belelli-Marchesini, Luca
    Valentini, Riccardo
    Issue Date
    2010-01-01
    Keywords
    carbon fluxes
    model parameterization
    steppe
    
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    Citation
    Vuichard, N., Ciais, P., Belelli-Marchesini, L., & Valentini, R. (2010). New parameterization of a global vegetation model for steppe ecosystem from southern siberian in situ measurements. Rangeland Ecology & Management, 63(1), 51-61.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642764
    DOI
    10.2111/REM-D-09-00028.1
    Additional Links
    https://rangelands.org/
    Abstract
    This article presents a new parameterization of the global vegetation organizing carbon and hydrology in dynamic ecosystems (ORCHIDEE) model, modifying the assimilation, allocation, and phenology processes for a steppe ecosystem. It aims 1) to improve the modeled growth primary production (GPP) based on both in situ CO2 flux measurements and remote-sensing data of the fraction of absorbed photosynthetic radiation, and 2) to evaluate how GPP improvement results in better-modeled fluxes for ecosystem respiration, net ecosystem exchange, and latent heat. This new parameterization leads to a realistic annual GPP (comparable to the data within 10%), and a realistic seasonal variability of GPP (R2 = 0.80). Further, we found that improving GPP into ORCHIDEE immediately brings ecosystem respiration and net ecosystem exchange fluxes into better agreement with the eddy-covariance data, both on seasonal but also on interannual time scales. This result suggests that the response of this steppe ecosystem to interannual climate variations can be well reproduced from the response to seasonal variation, and that biotic effects are not interannual. This indicates the potential ability to reproduce climate-induced changes in the carbon balance of steppes with the use of a generic process-oriented vegetation model such as ORCHIDEE. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-09-00028.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 63, Number 1 (January 2010)

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