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| Titel |
The European land and inland water CO2, CO, CH4 and N2O balance between 2001 and 2005 |
| VerfasserIn |
S. Luyssaert, G. Abril, R. Andres, D. Bastviken, V. Bellassen, P. Bergamaschi, P. Bousquet, F. Chevallier, P. Ciais, M. Corazza, R. Dechow, K.-H. Erb, G. Etiope, A. Fortems-Cheiney, G. Grassi, J. Hartmann, M. Jung, J. Lathière, A. Lohila, E. Mayorga, N. Moosdorf, D. S. Njakou, J. Otto, D. Papale, W. Peters, P. Peylin, P. Raymond, C. Rödenbeck, S. Saarnio, E.-D. Schulze, S. Szopa, R. Thompson, P. J. Verkerk, N. Vuichard, R. Wang, M. Wattenbach, S. Zaehle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 8 ; Nr. 9, no. 8 (2012-08-24), S.3357-3380 |
| Datensatznummer |
250007252
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| Publikation (Nr.) |
 copernicus.org/bg-9-3357-2012.pdf |
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| Zusammenfassung |
| Globally, terrestrial ecosystems have absorbed about 30% of anthropogenic
greenhouse gas emissions over the period 2000–2007 and inter-hemispheric
gradients indicate that a significant fraction of terrestrial carbon
sequestration must be north of the Equator. We present a compilation of the
CO2, CO, CH4 and N2O balances of Europe following a dual
constraint approach in which (1) a land-based balance derived mainly from
ecosystem carbon inventories and (2) a land-based balance derived from flux
measurements are compared to (3) the atmospheric data-based balance derived
from inversions constrained by measurements of atmospheric GHG (greenhouse gas)
concentrations. Good agreement between the GHG balances based on fluxes
(1294 ± 545 Tg C in CO2-eq yr−1), inventories (1299 ± 200 Tg C in CO2-eq yr−1) and inversions (1210 ± 405 Tg C in
CO2-eq yr−1) increases our confidence that the processes underlying
the European GHG budget are well understood and reasonably sampled. However,
the uncertainty remains large and largely lacks formal estimates. Given that
European net land to atmosphere exchanges are determined by a few dominant
fluxes, the uncertainty of these key components needs to be formally
estimated before efforts could be made to reduce the overall uncertainty.
The net land-to-atmosphere flux is a net source for CO2, CO, CH4
and N2O, because the anthropogenic emissions by far exceed the biogenic
sink strength. The dual-constraint approach confirmed that the European
biogenic sink removes as much as 205 ± 72 Tg C yr−1 from fossil
fuel burning from the atmosphere. However, This C is being sequestered in
both terrestrial and inland aquatic ecosystems. If the C-cost for ecosystem
management is taken into account, the net uptake of ecosystems is estimated
to decrease by 45% but still indicates substantial C-sequestration.
However, when the balance is extended from CO2 towards the main GHGs,
C-uptake by terrestrial and aquatic ecosystems is offset by emissions of
non-CO2 GHGs. As such, the European ecosystems are unlikely to
contribute to mitigating the effects of climate change. |
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