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UPR Preliminary Results from Analysis of Filter and Impactor Samples Collected at FNS during SMOCC

UPR Preliminary Results from Analysis of Filter and Impactor Samples Collected at FNS during SMOCC. Olga L. Mayol-Bracero , Susimar Gonzalez, Lydia Soto Institute for Tropical Ecosystem Studies University of Puerto Rico - Rio Piedras Campus, Puerto Rico

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UPR Preliminary Results from Analysis of Filter and Impactor Samples Collected at FNS during SMOCC

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  1. UPR Preliminary Results from Analysis of Filter and Impactor Samples Collected at FNS during SMOCC Olga L. Mayol-Bracero, Susimar Gonzalez, Lydia Soto Institute for Tropical Ecosystem Studies University of Puerto Rico - Rio Piedras Campus, Puerto Rico M. O. Andreae, T. W. Andreae, W. Elbert, G. Frank, A. Hoffer, I. Trebs Department of Biogeochemistry, Max Planck Institute for Chemistry Mainz, Germany W. Maenhaut Institute for Nuclear Sciences, Ghent University, Ghent, Belgium

  2. Samplers at FNS • Aerosol Filter/Impactor Sampling • Dekati Low-Pressure Impactor (DLPI) – 14 stages, 7 nm to 10 mm, running since Sept 15. • 2 Stacked Filter Units (SFUs) in parallel – fine and coarse modes, running since Sept 11. • Denuder Filter Pack (DFP) – fine mode (Dp < 2.5 mm), running since Sept 19. • SFU system using Nuclepore gold-plated filters (Dp < 2.5 mm), running since Sept 26.

  3. Analyses for Filter/Substrate Samples • Gravimetric - mass • Evolved Gas Analysis (EGA) - TC, ECa, ECw, OC • Ion Chromatography (IC)- water-soluble ions • Total Organic Carbon Analysis (TOC)– WSOC • Single Particle Analysis (e.g., Scanning electron microscope/Energy Dispersive Spectrometry, SEM/EDS) – morphology and elemental composition

  4. Analysis and Preliminary Results • Gravimetric Analysis – U. of Gent (WM) • Most of SFUs and DLPI samples • Plot of gravimetric data available for SFUs (fine vs coarse) • Size distribution of total aerosol mass for DLPI (sample 30 Oct – 1 Nov) • Evolved Gas Analysis – MPI-C (MOA) • Workshop samples (2 SFUs and 1 DLPI) • DLPI (23-24 Sept) – size-resolved aerosol TC mass concentrations • SFU (23-24 Sept and 30 Oct - 1 Nov) • Ion Chromatography – MPI-C (MOA) • Some of the DFP samples, NH4+ and NO3- (unprocessed data) • Total Carbon Analysis • Single Particle Analysis

  5. Preliminary Mass Concentrations during SMOCC (SFUs sampling - UPR-RP)

  6. Total Aerosol Mass Concentration as Function of Particle Size on Impactor Stage Workshop Sample 2 – DLPI 30 Oct – 1 Nov (Nighttime), Al foils (no chemical composition yet)

  7. Aerosol Total Carbon Mass Concentration as Function of Particle Size on Impactor StageWorkshop Sample 1 – DLPI 23-24 Sept (Nighttime), Quartz filters (not weighed) – EGA analysis

  8. Evolved Gas Analysis, Workshop Sample 1, SFU 23-24 Sept, EGA Analysis, Preliminary Results TC = 48.5 mg m-3 ECa = 30.7 mg m-3 ECw = 4.8 mg m-3 TH = 43.7 mg m-3 ECw/TC = 0.10 ECa/TC = 0.63 ECa removed by water = 84% Sample 2 (not shown): ECw/TC = 0.66 ECa/TC = 0.89 ECa removed by water = 25%

  9. Next Steps • Complete gravimetric analyses for DLPI and SFUs • Complete EGA analyses of DLPI and SFUs quartz filters • Complete IC analyses of DLPI, SFUs, and DFP • Try to perform TOC analysis in some DLPI samples • Calculate size-resolved mass concentrations for species of interest • Calculate the contribution of these species to the total aerosol mass • Compare results of the SFU, DFP and denuder-SJAC (water-soluble ions) • Gain a better understanding of what the properties are (molecular composition, functional groups,…) of the ECa that is water soluble since this species might play an important role in the CCN activity of biomass burning aerosols (polyacids, HULIS, lowering surface tension).

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