Combined CO2 state and flux estimation with the 4D-Var system EURAD-IM
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| Titles: | Main Title: Combined CO2 state and flux estimation with the 4D-Var system EURAD-IM Alternative Title: PhD-Report |
| Description: | 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: | Johannes Klimpt (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2016 |
Topic
| TR32 Topic: | Atmosphere |
| Related Subproject: | D3 |
| Subjects: | Keywords: Data Assimilation, CO2 Flux, PhD Report |
File Details
| Filename: | 15_07_15_klimpt_c.pdf |
| Data Type: | Text - Text |
| File Size: | 5.1 MB |
| Date: | Created: 30.01.2014 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| 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 |
Geographic
Specific Information - Report
| Report Date: | 15th of July, 2015 |
| Report Type: | PhD Report |
| Report City: | Cologne |
| Report Institution: | RIU |
Metadata Details
| Metadata Creator: | Johannes Klimpt |
| Metadata Created: | 06.01.2016 |
| Metadata Last Updated: | 06.01.2016 |
| Subproject: | D3 |
| Funding Phase: | 3 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 776 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 2 |
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