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Wenche Aas and Karl Espen Yttri (EMEP/CCC)

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Wenche Aas and Karl Espen Yttri (EMEP/CCC)

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Presentation Transcript

  1. Summary of what has been done and some first preliminary results related to the last EMEP intensive field measurements Wenche Aas and Karl Espen Yttri (EMEP/CCC)

  2. Outline • The experience and lesson learnt from the 2007-2008 intensive period • Background and content of the two latter periods • What has been measured by whom • How (methodology and time resolution) • First prelimenary results • How to proceed

  3. Experiences from the last EMEP Intensive periods in 2007 -2008 • Lot of different data –no clear priority • Problems with some non comparable data sets • OC, TC or OM are sometimes corrected and sometimes not. Not always known which temperature programme is used. Different filters. • Not known artefact for NO3, NH4 from filters (ex IT01) • Sometimes PM1 > PM2.5 > PM1.0 ( mass or speciation) • Non harmonised reporting • Different format and units, not always specified the PM size, neither method • Parallel reporting to EMEP/EUSAAR etc causing duplications and confusing • Unclear on Intellectual property rights • Nevertheless, a unique dataset for EMEP • Especially for hourly resolution – need a publication on this (MSC-W/CEH/PSI..) • What to do further with the speciation data is not decided

  4. Improvement for last periods • Clear guidelines of which measurements are needed/wanted • Harmonised measurement methods, especially needed for EC/OC –use reference • Data reporting in harmonised format • Improved information on Data ownership and IPR • (Better spatial distribution of the more advanced measurements )

  5. 1) What to measure • Mass closure (inorganic, crustal, EC/OC). Daily/weekly (EMEP) or hourly (EUCAARI) • Inorganic gas concentrations (HNO3, NH3) • Aerosol size distributions (EUCAARI/EUSAAR) • Separation of organic aerosol into • primary vs. secondary and • biogenic vs. anthropogenic components (e.g. levoglucosane, 14C); • Attempts to quantify aerosol water (EUCAARI) • Attempts to quantify the OC/OM ratio (EUCAARI) • Vertical profiles (coordinate with Earlinet)

  6. High resolution measurements EUCAARI: 11 AMS + 4 MARGA/GRAEGOR/SJAC To be presented by Eiko on wednesday

  7. Weekly speciation measurements

  8. 2) Harmonised measurement method • Filter from same batch (sendt from NILU) • Tandem filter approach (QBQ) • EC/OC with EUSAAR -2 • Levoglucosan at NILU • in addition FMI,Ispra, FR.. do levo analysis • Intercalibration beeing conducted • 14C at Bern (some at Lund) • Mineral dust –some guidelines given

  9. 3) Data reporting • Weekly speciation • 2008 data by normal EMEP data reporting before 31 July2009 (new deadline) • 2009 data with simplified excel format • Except from DE44, only EC/OC yet been reported • Hourly data (AMS) • Converting routines beetween AMS output to NASA AMES are beeing established (EUCAARI) • Eiko Nemitz received data (Wednesday)

  10. 4) Data ownership

  11. Results, EC/OC and Levoglucosan • OCp = particulate OC. Front – backup filter, conservative OC estimate • OC wood from levoglucosan analysis • Sites where we presently has data for both levoglucosan (analysed at NILU) and EC/OC • increasing concentrations along a Southern and Eastern transect.

  12. Further process • Weekly speciation • Filters sent to Bern for 14C analysis • Apportion analysis of the organic matter (latin hypercube) • EC from biomass and fossil fuel • OC from biomass, fossil fuel, biogenics • SOA from anthropogenic and bigenic precursors • QA: lab intercalibration for non central labs • Reporting and publication (EMEP special issue) • Hourly • Reporting format soon to be implemented • EUCAARI group to publish results