|
Read Full Article (file size: 1135498 bytes) Cited by
JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 113,
G01025,
doi:10.1029/2007JG000562,
2008
Use of FLUXNET in the Community Land Model development
R. Stöckli
Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA Climate Services, Federal Office of Meteorology and Climatology MeteoSwiss, Zürich, Switzerland NASA Earth Observatory, Goddard Space Flight Center, Greenbelt, Maryland, USA
D. M. Lawrence
Terrestrial Sciences Section, National Center for Atmospheric Research, Boulder, Colorado, USA
G.-Y. Niu
Department of Geological Sciences, University of Texas at Austin, Austin, Texas, USA
K. W. Oleson
Terrestrial Sciences Section, National Center for Atmospheric Research, Boulder, Colorado, USA
P. E. Thornton
Terrestrial Sciences Section, National Center for Atmospheric Research, Boulder, Colorado, USA
Z.-L. Yang
Department of Geological Sciences, University of Texas at Austin, Austin, Texas, USA
G. B. Bonan
Terrestrial Sciences Section, National Center for Atmospheric Research, Boulder, Colorado, USA
A. S. Denning
Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
S. W. Running
Numerical Terradynamics Simulation Group, University of Montana, Missoula, Montana, USA
Abstract
The Community Land Model version 3 (CLM3.0) simulates land-atmosphere exchanges in response to climatic forcings. CLM3.0 has
known biases in the surface energy partitioning as a result of deficiencies in its hydrological and biophysical parameterizations.
Such models, however, need to be robust for multidecadal global climate simulations. FLUXNET now provides an extensive data
source of carbon, water and energy exchanges for investigating land processes, and it encompasses a global range of ecosystem-climate
interactions. Data from 15 FLUXNET sites are used to identify and improve model deficiencies. Including a prognostic aquifer,
a bare soil evaporation resistance formulation and numerous other changes in the model result in a significantly improved
soil hydrology and energy partitioning. Terrestrial water storage increased by up to 300 mm in warm climates and decreased
in cold climates. Nitrogen control of photosynthesis is revealed as another missing process in the model. These improvements
increase the correlation coefficient of hourly and monthly latent heat fluxes from a range of 0.5–0.6 to the range of 0.7–0.9.
RMSE of the simulated sensible heat fluxes decrease by 20–50%. Primary production is overestimated during the wet season in
mediterranean and tropical ecosystems. This might be related to missing carbon-nitrogen dynamics as well as to site-specific
parameters. The new model (CLM3.5) with an improved terrestrial water cycle should lead to more realistic land-atmosphere
exchanges in coupled simulations. FLUXNET is found to be a valuable tool to develop and validate land surface models prior
to their application in computationally expensive global simulations.
Received 26
July
2007;
accepted 21
December
2007;
published 19
March
2008.
Keywords: land surface model;
land-atmosphere exchange;
FLUXNET;
terrestrial water storage;
soil moisture.
Index Terms: 1631 Global Change: Land/atmosphere interactions (1218, 1843, 3322); 1847 Hydrology: Modeling; 1878 Hydrology: Water/energy interactions (0495); 1848 Hydrology: Monitoring networks; 1626 Global Change: Global climate models (3337, 4928).
Read Full Article (file size: 1135498 bytes) Cited by
Citation: Stöckli, R., D. M. Lawrence, G.-Y. Niu, K. W. Oleson, P. E. Thornton, Z.-L. Yang, G. B. Bonan, A. S. Denning, and S. W. Running
(2008),
Use of FLUXNET in the Community Land Model development,
J. Geophys. Res.,
113,
G01025,
doi:10.1029/2007JG000562.
Copyright 2008 by the American Geophysical Union.
|