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An attempt to quantify fossil fuel CO 2 over Europe

An attempt to quantify fossil fuel CO 2 over Europe. Ute Karstens 1 , Ingeborg Levin 2. 1 Max-Planck-Institut für Biogeochemie, Jena 2 Institut für Umweltphysik, Universität Heidelberg. How large is the contribution from fossil fuels to the amount of CO 2 in the atmosphere?.

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An attempt to quantify fossil fuel CO 2 over Europe

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  1. An attempt to quantify fossil fuel CO2 over Europe Ute Karstens1, Ingeborg Levin2 1 Max-Planck-Institut für Biogeochemie, Jena 2 Institut für Umweltphysik, Universität Heidelberg

  2. How large is the contribution from fossil fuels to the amount of CO2 in the atmosphere? … from a modeller’s perspective

  3. -10 0 10 20 30 40 50 February CO2 Fluxes Fossil fuel CO2 (EDGAR V3.2 FT, Olivier et al., 2005) Biome-BGC NEE (Churkina et al., 2003) annual mean 2000 February 2002 10-9 kg C m-2 s-1

  4. Heidelberg: February 2002 (REgional MOdel)

  5. Heidelberg: June 2002(REgional MOdel)

  6. Schauinsland: February 2002(REgional MOdel)

  7. Fossil fuel experiment Objective: Assess the impact of new « hourly estimates » of fossil fuel emissions over Europe at continental sites using different transport models • Inventories: • TransCom 3 • EDGAR ft 2000 yearly • EDGAR ft 2000 hourly • IER 2000 hourly • Models: • LMDz • TM5 • TM3 • DEHM • REMO

  8. Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2002 Fossil fuel experiment

  9. How to measure fossil fuel CO2in the atmosphere? —› Radiocarbon (14C) in atmospheric CO2 … … because fossil fuel CO2 contains no 14C and dilutes atmospheric 14CO2

  10. 14CO2 monitoring sites in (Carbo)Europe Mace Head Lutjewad Paris Heidelberg Schauinsland Krakow Jungfraujoch Kasprowy REMO mean european fossil fuel CO2 in January 2002 at 130m [ppm]

  11. Comparison with REMO 20 15 10 5 0 20 15 10 5 0 35 30 25 20 15 10 5 0 35 30 25 20 15 10 5 0 CO2 fossil fuel [ppm] CO2 fossil fuel [ppm] 5 4 3 2 1 0 5 4 3 2 1 0 35 30 25 20 15 10 5 0 35 30 25 20 15 10 5 0 Measured CO2(foss) mixing ratio Data provided by R. Neubert (Lutjewad) and K. Rozanski (Krakow)

  12. jfj jfj tvr tvr hei hei pal pal prs prs sch sch hun hun cbw cbw mhd mhd Measured CO2(foss) mixing ratio Comparison with models TM3 LMDZ HANK DEHM REMO OBS JULY – 1998 DECEMBER – 1998 20 15 10 5 0 -5 12 10 8 6 4 2 0 -2 CO2 fossil fuel [ppm] Geels et al., 2005, CO2 model comparison

  13. 14C is an excellent tracer for fossil fuel CO2 … but the network of 14C measurements is sparse: 8 - 10 stations across Europe … and the temporal resolution is poor: weekly means

  14. —›proxies/surrogates needed to substitute 14CO2 observations Carbon Monoxide (CO)

  15. EDGAR V3.2 FT 2000 (Olivier et al., 2005) IER mean 2000 (Scholz et al., IER 2005) mmol / mol 0 10 20 30 40 50 60 hourly emissions on 50 km x 50 km grid annual mean emissions on global 1°x1° grid CO/CO2 fossil fuel emission ratios 2000

  16. Comparison of measured and REMO-modelled atmospheric CO and CO2(foss) CO and CO2(foss) corrected with 222Rn(obs)/222Rn(mod)

  17. Comparison of measured and REMO-modelled CO/CO2(foss) ratios Mean ratios [ppb/ppm]: Observations: 13.5±2.5 REMO & EDGAR: 12.7±0.6 REMO & IER: 11.0±0.8 CO2(foss)corr RMSE [%] REMO & EDGAR: 21.4 REMO & IER: 42.7

  18. Conclusions (I): • Fossil fuel CO2 emissions in Europe contribute almost half to the continental CO2 signal. • Monthly mean fossil fuel CO2 levels at urban sites can be determined by high precision 14CO2 measurements to better than ±10% in winter and about ±30% in summer. • At remote sites, the mean fossil fuel CO2 signal is small (1-5 ppm) and can be determined by 14CO2 measurements only to about 30%. • 14C-derived fossil fuel CO2 at selected stations is needed to validate emissions inventories and assess model estimates of fossil fuel CO2.

  19. Conclusions (II): CO is a potentially applicable surrogate tracer for fossil fuel CO2, however, • Emissions inventories of CO and fossil fuel CO2 are yet not accurate enough to apply it quantitatively, • Non-fossil CO sources, in particular soil emissions and their temporal variations, strongly influence the results and need to be estimated more accurately, • The catchment area and relative mix of emissions needs to be known accurately, this requires modelling, • Validation at a larger number of sites is necessary e.g. at one site per country, at least in Europe.

  20. Thank you !

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