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Understanding the European Greenhouse Gas Balance: A Bottom-Up vs Top-Down Approach

This paper discusses the European greenhouse gas (GHG) balance utilizing both bottom-up and top-down approaches. It highlights the similarities in gross primary productivity (GPP) at the canopy level and examines the carbon dioxide (CO2) and nitrous oxide (N2O) fluxes. Key findings indicate that while grassland sinks may increase, the forest biomass sink in Eastern Europe is not secure. Overall, the GHG balance for EU-25 is found to be zero, emphasizing the need to consider the nitrogen cycle alongside carbon cycling in environmental studies.

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Understanding the European Greenhouse Gas Balance: A Bottom-Up vs Top-Down Approach

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  1. The bottom-up approach

  2. Soils Network

  3. Eddy Flux network

  4. Zanchi et al. in press

  5. Ciais et al., 2008

  6. Magnani et al., 2007

  7. Harrison et al., 2000

  8. Kutsch, Rebmann, unpublished

  9. Janssens, Ciais, Luyssaert and Schulze, unpublished

  10. at canopy level GPP is very similar Janssens, Ciais, Luyssaert and Schulze, unpublished

  11. grassland > forest Janssens, Ciais, Luyssaert and Schulze, unpublished

  12. other GHGs • balance the grassland sink • increase cropland losses Janssens, Ciais, Luyssaert and Schulze, unpublished

  13. forest biomass sink not secure Janssens, Ciais, Luyssaert and Schulze, unpublished

  14. The top-down approach

  15. Atmospheric network

  16. Figure: M. Heimann

  17. The European GHG balance

  18. GHGs add 10% to GWP

  19. ecosystems compensate 10% of fossil and other fluxes the N2O flux is as large as the forest sink

  20. the entire European sink is in Eastern Europe

  21. Conclusions • The GHG balance of EU-25 is zero • The Euopean GHG sink is located in eastern Europe • We cannot study the carbon cycle in isolation. We have to seriously take the N-cycle on board

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