The Simulation of the Opposing Fluxes of Latent Heat and CO2 over Various Land-Use Types: Coupling a Gas Exchange Model to a Mesoscale Atmospheric Model

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Title:Main Title: The Simulation of the Opposing Fluxes of Latent Heat and CO2 over Various Land-Use Types: Coupling a Gas Exchange Model to a Mesoscale Atmospheric Model
Description:Abstract: Amesoscalemeteorological model (FOOT3DK) is coupled with a gas exchange model to simulate surface fluxes of CO2 and H2O under field conditions. The gas exchange model consists of a C3 single leaf photosynthesis sub-model and an extended big leaf (sun/shade) sub-model that divides the canopy into sunlit and shaded fractions. Simulated CO2 fluxes of the stand-alone version of the gas exchange model correspond well to eddycovariance measurements at a test site in a rural area in the west of Germany. The coupled FOOT3DK/gas exchange model is validated for the diurnal cycle at singular grid points, and delivers realistic fluxes with respect to their order of magnitude and to the general daily course. Compared to the Jarvis-based big leaf scheme, simulations of latent heat fluxes with a photosynthesis-based scheme for stomatal conductance are more realistic. As expected, flux averages are strongly influenced by the underlying land cover. While the simulated net ecosystem exchange is highly correlated with leaf area index, this correlation ismuch weaker for the latent heat flux. Photosynthetic CO2 uptake is associated with transpirational water loss via the stomata, and the resulting opposing surface fluxes of CO2 and H2O are reproduced with the model approach. Over vegetated surfaces it is shown that the coupling of a photosynthesis-based gas exchange model with the land-surface scheme of a mesoscale model results in more realistic simulated latent heat fluxes.
Identifier:10.1007/s10546-010-9574-0 (DOI)
Responsible Party
Creators:Mark Reyers (Author), Andreas Krüger (Author), Christiane Werner (Author), Stefan Zacharias (Author), Michael Kerschgens (Author)
Publisher:Springer
Publication Year:2013
Topic
TR32 Topic:Atmosphere
Related Subproject:D1
Subjects:Keywords: C3 Single Leaf Photosynthesis, Latent Heat Flux, NEE, Stomatal Conductance, Sun-Shade
File Details
Filename:2010_Reyers_BLM.pdf
Data Type:Text - Article
Size:21 Pages
File Size:967 KB
Dates:Accepted: 07.10.2010
Issued: 28.10.2010
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:[TR32DB] Data policy agreement
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Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Boundary-Layer Meteorology
Source Website:www.Springerlink.com
Volume:139
Number of Pages:21 (121 - 141)
Metadata Details
Metadata Creator:Mark Reyers
Metadata Created:03.12.2013
Metadata Last Updated:03.12.2013
Subproject:D1
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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