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Global Modeling of the Oceanic source of Organic Aerosols: Primary and Secondary sources.

Global Modeling of the Oceanic source of Organic Aerosols: Primary and Secondary sources. Stelios Myriokefalitakis 1 Elisabetta Vignati 2 Kostas Tsigaridis 3 Christos Papadimas 4 Maria Kanakidou 1 mariak@chemistry.uoc.gr

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Global Modeling of the Oceanic source of Organic Aerosols: Primary and Secondary sources.

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  1. Global Modeling of the Oceanic source of Organic Aerosols: Primary and Secondary sources. Stelios Myriokefalitakis1 Elisabetta Vignati 2 Kostas Tsigaridis3 Christos Papadimas4Maria Kanakidou1 mariak@chemistry.uoc.gr 1- Environmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, Voutes Campus, 71003 Heraklion, Greece 2- EI-JRC, Italy 3- GISS NASA, New York, USA 4- University of Ioannina, Greece With experimental input from Cristina Facchini5 Jean Sciare6 Nikos Mihalopoulos1 5-CNR Bologna, Italy 6- LSCE- Gif-sur-Yvette France Presented at the IGAC Conference Sept 2008  improved since then S. Crete, July 2008

  2. TM4- ECPLglobal modeling of marine OAApproach • Sea-salt i) from AEROCOM • ii) wind driven parameterisation (2 modes) • OM % (three different fitting parameterisations) • %OM=63.015 [Chl-a] +10 O’Dowd et al GRL 2008 • [%] OM= 49.129 [Chl-a] [mg.m-3] Langmann et al AE 2008 • %OM = 43.5[Chl-a] +13.8 update by MCF & EV 2008 • Chl-a monthly mean retrievals from i) MODIS • ii) SeaWiFs • Marine SOA from marine isoprene & from DMS oxidation (MS-) MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr

  3. Annual mean surface distribution of Chl-a in mg m-3 as retrieved from MODIS from SeaWiFS MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr

  4. MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr

  5. Sea-salt Marine SOA from isoprene % POA in ss Marine isoprene Annual mean MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr marine POA marine POA

  6. SOA components –annual mean - surface SOA from marine isoprene Marine SOA from isoprene Gas to particle conversion 40% MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr Marine SOA from DMS MS- multiphase 60%

  7. North Atlantic S. Indian Ocean MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr East Mediterranean

  8. Methanesulfonate (MS-) TM4 model versus observations MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr

  9. Contribution to the marine OA –surface -annual mean POA_oc/OA_oc SOA_oc/OA_oc OA_ocean / OA_land+ocean marine OA/ total OA –surface -annual mean MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr

  10. summary & challenges • The Global Oceanic Source of POA is estimated at 13 Tg/y with a large uncertainty range from 2.4 to 20 Tg-POA/y (to compare with ~12 Tg/y of fossil fuel + biofuel emissions ) • %OM=63.015 [Chl-a] +10 O’Dowd et al GRL 2008 • ~6.5Tg/y • [%] OM= 49.129 [Chl-a] [mg.m-3] Langmann et al AE 2008 • 2.4Tg/y • %OM = 43.5[Chl-a] +13.8 update by MCF & EV 2008 • ~6.5Tg/y • The global source of Marine SOA is estimated at about 4 Tg/y. • SOA source from marine isoprene oxidation is ~0.05 Tg/y on global scale with 60% produced via multiphase chemistry. • Paper to be submitted in 2008 Myriokefalitakis et al. • Marine SOA from DMS appears to be the major component of marine SOA on global scale – updated scheme that seems to work at various locations MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr

  11. Missing information on VOC emissions from the oceans (monoterpenes , high hydrocarbons with potential to form SOA)  could produce more SOA than calculated here ? • How to account for organic nitrogen formation and amines in the marine environment? • Evaluate model against clean sector observations • Use of daily Chl-a distributions? MAP Final meeting WP5- ECPL Kanakidou M mariak@chemistry.uoc.gr

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