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The European land and inland water CO2, CO, CH4 and N2O balance between 2001 and 2005
CEA CNRS UVSQ, France .
University of Bordeaux, France .
Oak Ridge National Lab, USA .
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
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2012 (English)In: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 9, no 8, 3357-3380 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
European Geosciences Union (EGU) / Copernicus Publications , 2012. Vol. 9, no 8, 3357-3380 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-84363DOI: 10.5194/bg-9-3357-2012ISI: 000308290200034OAI: oai:DiVA.org:liu-84363DiVA: diva2:558771
Note

Funding Agencies|ERC|242564263522233366|US Department of Energy, Office of Science, Biological and Environmental Research (BER) programs||Oak Ridge National Laboratory (ORNL) under US Department of Energy|DE-AC05-00OR22725|Swedish Research councils VR||FORMAS||Linkoping University||European Commission under EU|212196|German Research Foundation (DFG)|EXC117HA4472-6/1|EU-project GHG Europe|244122|EU||Geoland-2||

Available from: 2012-10-05 Created: 2012-10-05 Last updated: 2017-12-07

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Bastviken, David

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