EGU2020-5567
https://doi.org/10.5194/egusphere-egu2020-5567
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Impact of using various prior flux models on the posterior NEE derived from the Jena Carboscope regional inversion system

Saqr Munassar1, Christoph Gerbig1, Frank-Thomas Koch2, and Christian Rödenbeck1
Saqr Munassar et al.
  • 1Max-Planck Institute for Biogeochemistry, Jena, Germany (smunas@bgc-jena.mpg.de)
  • 2Deutscher Wetterdienst, Meteorological Observatory Hohenpeissenberg, Germany

Regional flux estimates over Europe have been calculated using the two-step inverse system of the Jena CarboScope Regional inversion (CSR) to estimate the annual CO2 budgets for recent years, in cooperation with the research project VERIFY. The CSR system assimilates observational datasets of CO2 mixing ratio provided by the Integrated Carbon Observation System (ICOS) across the European domain to optimize Net Ecosystem Exchange (NEE) fluxes computed from biosphere models at a spatial resolution of 0.25 degree. Ocean fluxes are assumed to be constant over time. Fossil fuel emissions are obtained from EDGAR_v4.3 and updated based on British Petroleum (BP) statistics. Therefore, only biosphere-atmosphere exchange fluxes are considered to be optimized against the atmospheric data.

In this study we focus on the impact of using a-priori fluxes from different biosphere and ocean models on the annual CO2 budget of posterior fluxes. Results calculated using the Vegetation and Photosynthesis Respiration Model (VPRM) and Simple Biosphere/Carnegie-Ames Stanford Approach (SiBCASA) models show a consistent posterior interannual variability, largely independent of which prior fluxes are used, even though those prior fluxes show considerable differences on annual scales.

How to cite: Munassar, S., Gerbig, C., Koch, F.-T., and Rödenbeck, C.: Impact of using various prior flux models on the posterior NEE derived from the Jena Carboscope regional inversion system, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-5567, https://doi.org/10.5194/egusphere-egu2020-5567, 2020

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