[1211] - Combined CO2 state and flux estimation with the 4D-Var system EURAD-IM

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Klimpt, J., 2015. Combined CO2 state and flux estimation with the 4D-Var system EURAD-IM. PhD Report, RIU, Cologne. Accessed from https://www.tr32db.uni-koeln.de/data.php?dataID=1211 at 2019-07-20.
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Title(s):Main Title: Combined CO2 state and flux estimation with the 4D-Var system EURAD-IM
Alternative Title: PhD-Report
Description(s):Abstract: Regional CO2 inversion requires the use of fine spatial and temporal resolutions. The short term variability of CO2 concentrations is very high due to terrestrial fluxes and atmospheric transport. The inversion of CO2 fluxes can be influenced by wrong initial values of atmospheric concentration. The joint optimisation seeks to improve the inversion of CO2 fluxes by taking uncertainties of initial concentrations into account. In this paper the 4D-Var cost function for a joint optimisation of fluxes and initial values is shown. A series of synthetic data experiments with the 4D-Var system EURAD-IM is shown. 1D experiments illustrate the dependecy of the flux strength to the gradient of the adjoint model. The background error covariance matrices are modelled such that a compromise between sensitivity and robustness of the minimisation procedure can be accomplished. Identical twin experiment using anthropogenic emissions from TNO and biogenic CO2 fluxes calculated with WRF-CLM are performed. The joint optimisation shows supperior analysis results compared to the optimisation of only one parameter, but bears also new risks.
Responsible Party
Creator(s):Author: Johannes Klimpt
Publisher:CRC/TR32 Database (TR32DB)
TR32 Topic:Atmosphere
Related Sub-project(s):D3
Subject(s):CRC/TR32 Keywords: Data Assimilation, CO2 Flux, PhD Report
File Details
File Name:15_07_15_klimpt_c.pdf
Data Type:Text
File Size:5204 kB (5.082 MB)
Date(s):Created: 2014-01-30
Mime Type:application/pdf
Data Format:PDF
Download Permission:Free
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:None
Measurement Location:--None--
Specific Informations - Report
Report Date:15th of July, 2015
Report Type:PhD Report
Report City:Cologne
Report Institution:RIU
Number Of Pages:23
Metadata Details
Metadata Creator:Johannes Klimpt
Metadata Created:2016-01-06
Metadata Last Updated:2016-01-06
Funding Phase:3
Metadata Language:English
Metadata Version:V41
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Dataset Downloads:2
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