Inclusion of CO2 fluxes in a coupled mesoscale land surface and atmospheric model

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Title:Main Title: Inclusion of CO2 fluxes in a coupled mesoscale land surface and atmospheric model
Description:Abstract: An essential part of a successful weather prediction with numerical models is an accurate simulation of the interaction of the land surface with the lower atmosphere. The model system TerrSysMP couples the atmospheric model COSMO with the Community Land Model (CLM) which again can be coupled to the hydrological model ParFlow. TerrSysMP comprehensively simulates the exchange processes between the soil, the vegetation and the atmosphere in terms of water, carbon dioxide (CO2), heat and momentum fluxes. Field measurements on the regional scale indicate distinct spatio-temporal heterogeneities in the atmospheric CO2 concentration. This variability is caused by different plant types (e.g. agriculture, forest, grassland) that produce different net CO2 fluxes as well as by atmospheric transport. The net CO2 flux consists of the photosynthesis rate as an atmospheric sink as well as plant and soil respiration as sources for the atmospheric CO2 concentration. The stomatal resistance of the plants that controls the plant transpiration and photosynthesis depends mainly on the atmospheric humidity and CO2 distribution. Thus, for a consistent modeling of latent and sensible heat fluxes at the land surface a detailed treatment of the net CO2 flux between the canopy and the atmospheric planetary boundary layer (PBL) is of particular importance. In the default configuration of CLM photosynthesis and transpiration are calculated by utilizing a constant value of the atmospheric CO2 partial pressure. In contrast to this treatment, TerrSysMP couples a prognostic atmospheric CO2 concentration with the CLM that computes the net CO2 flux. This flux in turn is coupled with the COSMO model. We expect that the direct response of the stomatal resistance on the varying CO2 patterns has a noticeable influence on the moisture and heat fluxes at the land surface which in turn may have a strong impact on the time evolution of the PBL. Whereas in the first and second semi-annual reports the focus was on the inclusion of a tracer in COSMO for the atmospheric transport of CO2 and on a detailed description of the coupling procedure, this report mainly concentrates on the parameterization of the CO2 fluxes. Furthermore, first model results and future working steps will be described.
Responsible Party
Creator:Markus Übel (Author)
Publisher:CRC/TR32 Database (TR32DB)
Publication Year:2013
Topic
TR32 Topic:Atmosphere
Related Subproject:C4
Subject:Keyword: PhD Report
File Details
Filename:Report4_Uebel_2013.pdf
Data Type:Text - Text
File Size:2.3 MB
Date:Available: 13.05.2013
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
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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Specific Information - Report
Report Date:13th of May, 2013
Report Type:PhD Report
Report City:Bonn, Germany
Report Institution:Meteorological Institute, University Bonn
Number of Pages:14 (1 - 14)
Further Information:TR32 Student Report Phase II
Metadata Details
Metadata Creator:Markus Übel
Metadata Created:06.12.2013
Metadata Last Updated:06.12.2013
Subproject:C4
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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