The bottom-up approach
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The European Carbon Balance by atmospheric and terrestrial mesurements
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An update of the dual constraint approach
to derive a continental C balance
E-D Schulze, P Ciais, S Luyssaert, JF Soussana, P Smith, I Janssens, H Dolman, R Valentini, M Heimann
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The European Carbon BalanceE-D Schulze et al.
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The European Carbon BalanceE-D Schulze et al.
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The European Carbon BalanceE-D Schulze et al.
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The European Carbon BalanceE-D Schulze et al.
The bottom-up approach
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The European Carbon BalanceE-D Schulze et al.
Soils Network
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The European Carbon BalanceE-D Schulze et al.
Eddy Flux network
main flux sites
active associated
sitestotal
coniferous 12 11 23
deciduous 8 3 11
evergreen broadleaf 4 2 6
mixed coniferous/deciduous
2 1 3
crops 9 16 25
grassland 15 8 23
total 50 41 91
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The European Carbon BalanceE-D Schulze et al.
Zanch
i et
al. in p
ress
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The European Carbon BalanceE-D Schulze et al.
Ciais et al., 2008
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The European Carbon BalanceE-D Schulze et al.
Magnani et al., 2007
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The European Carbon BalanceE-D Schulze et al.
Harrison et al., 2000
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The European Carbon BalanceE-D Schulze et al.
Kutsch, Rebmann,unpublished
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The European Carbon BalanceE-D Schulze et al.
Janssens, Ciais, Luyssaert and Schulze, unpublished
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The European Carbon BalanceE-D Schulze et al.
Janssens, Ciais, Luyssaert and Schulze, unpublished
at canopy levelGPP is very similar
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The European Carbon BalanceE-D Schulze et al.
Janssens, Ciais, Luyssaert and Schulze, unpublished
grassland > forest
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The European Carbon BalanceE-D Schulze et al.
Janssens, Ciais, Luyssaert and Schulze, unpublished
other GHGs-balance the grassland sink-increase cropland losses
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The European Carbon BalanceE-D Schulze et al.
forest biomasssink not secure
Janssens, Ciais, Luyssaert and Schulze, unpublished
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The European Carbon BalanceE-D Schulze et al.
The top-down approach
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The European Carbon BalanceE-D Schulze et al.
Atmospheric network
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The European Carbon BalanceE-D Schulze et al.
Figure: M. Heimann
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The European Carbon BalanceE-D Schulze et al.
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The European Carbon BalanceE-D Schulze et al.
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The European Carbon BalanceE-D Schulze et al.
The European GHG balance
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The European Carbon BalanceE-D Schulze et al.
GHGs add10% toGWP
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The European Carbon BalanceE-D Schulze et al.
ecosystemscompensate 10% of fossil and other fluxes
the N2O flux is as large as the forest sink
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The European Carbon BalanceE-D Schulze et al.
Average of top-down & bottom-up fluxes
The continent of Europe
New estimate by CarboEurope-IP
EU-25 New estimate by CarboEurope-IP
Flux
(Tg C yr-1) Relative
uncertainty Flux
(Tg C yr-1) Relative
uncertainty
Av. land-atmosphere CO2-flux 1294 * * 945 * *
Av. GHG CO2eq flux (CO2+CH4+N2O) 1513 * -1086 *
Av. ecosystem CO2 balance (forest, grassland, crops, peatland)
-337 * -143 *
Av. ecosystem GHG CO2eq balance (CO2+CH4+N2O) -117 * -3 *
Av. land-based CO2 balance (ecosystems+river export+peat extraction+landfill)
-344 * -143 *
Av. land-based GHG CO2eq balance -124 * -2 *
the entire European sink is in Eastern Europe
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The European Carbon BalanceE-D Schulze et al.
• 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