Fossil and modern sources of aerosol carbon in the Netherlands – A year-long radiocarbon study U. Dusek 1 , M. Monaco 1 , A. Kappetijn 1 , T. Röckmann 1 S. Szidat 2 , H. A. J. Meijer 3 , J. van der Plicht 3 , 1 Institute for Marine and Atmospheric research Utrecht (IMAU), the Netherlands 2 Center for Isotope Research, Groningen University, the Netherlands 3 Laboratory for Radiochemistry and Environmental Chemistry, University of Bern, Switzerland
16
Embed
Fossil and modern sources of aerosol carbon in the Netherlands – A year-long radiocarbon study
Fossil and modern sources of aerosol carbon in the Netherlands – A year-long radiocarbon study . U. Dusek 1 , M. Monaco 1 , A. Kappetijn 1 , T . Röckmann 1 S . Szidat 2 , H . A. J. Meijer 3 , J. van der Plicht 3 , - PowerPoint PPT Presentation
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Fossil and modern sources of aerosol carbon in the Netherlands – A year-long radiocarbon study
U. Dusek1, M. Monaco1, A. Kappetijn1, T. Röckmann1
S. Szidat2, H. A. J. Meijer3, J. van der Plicht3, 1 Institute for Marine and Atmospheric research Utrecht (IMAU), the Netherlands
2 Center for Isotope Research, Groningen University, the Netherlands3 Laboratory for Radiochemistry and Environmental Chemistry, University of Bern, Switzerland
Radiocarbon
Carbon isotopes:C12 : 98.89 %C13: 1.11 %
C14: 0.0000000001%Half life: 5730 yrs
Produced bycosmic rays
Exchange withBiosphere as 14CO2
Decay whenExchange withBiosphere stops
Unit of measurement:Fraction modern
fm = 14C sample/14C standard
Standard: oxalic acid (typical activity of 1950 biosphere)
fm > 1 possible through bomb tests
Carbonaceous aerosol: 14C for source apportionment
Biomass burning Fossil fuel Biogenic
EC OC
fm = 1.1 - 1.2 fm = 0 fm ~ 1.04
Thermally refractory Volatile - refractory
From aerosol particles to 14C measurement
Sampling: Goal: 50 – 500 ug C
High volume samplers: 500 l/min of air through filter
Convert OC and EC to CO2 Measure 14C content with AMS