caa a22 4500 467902836 CHVBK 20180406152823.0 cr unu---uuuuu 170328e20060601xx s 000 0 eng 10.1007/s10661-006-0775-4 doi (NATIONALLICENCE)springer-10.1007/s10661-006-0775-4 Identifying the European Fossil Fuel Plumes in the Atmosphere Over the Northeast Atlantic Region Through Isotopic Observations and Numerical Modelling [Elektronische Daten] [C. Geels, J. Christensen, A. Hansen, J. Heinemeier, S. Kiilsholm, N. Larsen, S. Larsen, T. Pedersen, L. Sørensen, J. Brandt, L. Frohn, S. Djurhuus] As part of the Danish NEAREX project the origin and variability of anthropogenic atmospheric CO2 over the Northeast Atlantic Region (NEAR) has been studied. The project consisted of a combination of experimental and modelling activities. Local volunteers operated CO2 sampling stations, built at University of Copenhagen, for 14C analysis at four locations (East Denmark, Shetland Isles, Faroe Isles and Iceland). The samples were only collected during winter periods of south-easterly winds in an attempt to trace air enriched in fossil-fuel derived CO2 due to combustion of fossil fuels within European countries. In order to study the transport and concentration fields over the region in detail, a three-dimensional Eulerian hemispheric air pollution model has been extended to include the main anthropogenic sources for atmospheric CO2. During the project period (1998-2001) only a few episodes of transport from Central Europe towards NEAR arose, which makes the data set for the evaluation of the method sparse. The analysed samples indicate that the signal for fossil CO2, as expected, is largest (up to 3.7±0.4% fossil CO2) at the Danish location closest to the European emissions areas and much weaker (up to ∼1.5±0.6% fossil CO2) at the most remote location. As the anthropogenic signal is weak in the clean atmosphere over NEAR these numbers will, however, be very sensitive to the assumed background 14CO2 activity and the precision of the measurements. The model simulations include the interplay between the driving processes from the emission into the boundary layer and the following horizontal/vertical mixing and atmospheric transport and are used to analyse the meteorological conditions leading to the observed events of high fossil CO2 over NEAR. This information about the history of the air masses is essential if an observed signal is to be utilised for identifying and quantifying sources for fossil CO2. Springer Science + Business Media, Inc., 2006 atmospheric transport nationallicence 14C nationallicence fossil fuel CO2 nationallicence numerical modeling nationallicence the North East Atlantic Region nationallicence Geels C. Department of Atmospheric Environment, National Environmental Research Institute, Denmark aut Christensen J. Department of Atmospheric Environment, National Environmental Research Institute, Denmark aut Hansen A. Department of Geophysics, University of Copenhagen, Denmark aut Heinemeier J. AMS 14C Dating Laboratory, Department of Physics and Astronomy, University of Aarhus, Denmark aut Kiilsholm S. Danish Meteorological Institute, Denmark aut Larsen N. Institute of Chemistry, University of Copenhagen, Denmark aut Larsen S. Risø National Laboratory, Denmark aut Pedersen T. Institute of Chemistry, University of Copenhagen, Denmark aut Sørensen L. Risø National Laboratory, Denmark aut Brandt J. Department of Atmospheric Environment, National Environmental Research Institute, Denmark aut Frohn L. Department of Atmospheric Environment, National Environmental Research Institute, Denmark aut Djurhuus S. Risø National Laboratory, Denmark aut Environmental Monitoring and Assessment Kluwer Academic Publishers 117/1-3(2006-06-01), 387-409 0167-6369 117:1-3<387 2006 117 10661 https://doi.org/10.1007/s10661-006-0775-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-006-0775-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Geels C. Department of Atmospheric Environment, National Environmental Research Institute, Denmark aut NATIONALLICENCE 700 1- Christensen J. Department of Atmospheric Environment, National Environmental Research Institute, Denmark aut NATIONALLICENCE 700 1- Hansen A. Department of Geophysics, University of Copenhagen, Denmark aut NATIONALLICENCE 700 1- Heinemeier J. AMS 14C Dating Laboratory, Department of Physics and Astronomy, University of Aarhus, Denmark aut NATIONALLICENCE 700 1- Kiilsholm S. Danish Meteorological Institute, Denmark aut NATIONALLICENCE 700 1- Larsen N. Institute of Chemistry, University of Copenhagen, Denmark aut NATIONALLICENCE 700 1- Larsen S. Risø National Laboratory, Denmark aut NATIONALLICENCE 700 1- Pedersen T. Institute of Chemistry, University of Copenhagen, Denmark aut NATIONALLICENCE 700 1- Sørensen L. Risø National Laboratory, Denmark aut NATIONALLICENCE 700 1- Brandt J. Department of Atmospheric Environment, National Environmental Research Institute, Denmark aut NATIONALLICENCE 700 1- Frohn L. Department of Atmospheric Environment, National Environmental Research Institute, Denmark aut NATIONALLICENCE 700 1- Djurhuus S. Risø National Laboratory, Denmark aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 117/1-3(2006-06-01), 387-409 0167-6369 117:1-3<387 2006 117 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer