CalNex Data Workshop, Sacramento May 16-19, 2011 Characterization of black carbon-containing particles from AMS measurements on the R/V Atlantis during.

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Presentation transcript:

CalNex Data Workshop, Sacramento May 16-19, 2011 Characterization of black carbon-containing particles from AMS measurements on the R/V Atlantis during CalNex 2010 Paola Massoli 1, K. Hayden 2, I. Nuamaan 2,3, D. Sueper 4, S.M. Li 2, C. Cappa 5, J. Hakala 6, D. Worsnop 1, and Timothy Onasch 1 1 Aerodyne Research, Billerica, MA 2 Environment Canada, Toronto 3 York University, Toronto 4 CU Boulder 5 UC Davis 6 University of Helsinki

R/V Atlantis on the Sacramento River ( photo taken from the DoE G1 plane ) Guest Van PMEL aerosol inlet

SP-AMS (ARI) Guest Van Layout CalNex 2010 VH-TDMA (U. Helsinki) SMPS (Env. CA) PAS/CRD (UC Davis) HR-AMS (Env.CA) SP2 (Env. CA) ARI Thermal Denuder PM 1

Guest Van Measurement Objectives a) Soot particle mass loading, chemical composition, size distributions (SP-AMS, HR-AMS, SMPS, SP2) b) PM chemical composition and optical properties as a function of T (TD-SP-AMS; TD-HR-AMS; TD-PAS) c) Hygroscopic growth factors (GF) as a function of particle size, volatility, and RH (VH-TDMA) d) Particle optical properties: absorption, extinction, fRH (PAS, CRD)  Combine chemical, microphysical, optical properties  Source emission characterizations (e.g., shipping)

ToF Aerosol Mass Spectrometer (HR-AMS) ToF Aerosol Mass Spectrometer (HR-AMS)  Detect submicron refractory material (black carbon) under SP2-like incandescence conditions SP2-like incandescence conditions  Measure the chemical composition of the non-refractory coating material (e.g. organics, sulfate, nitrate) coating material (e.g. organics, sulfate, nitrate) Soot Particle Aerosol Mass Spectrometer (SP-AMS) Soot Particle Aerosol Mass Spectrometer (SP-AMS)

BC Quantification SP-AMS vs SP2 for different BC standards Regal Black represents well ambient BC during CalNex 2010

10 min average ship plumes removed Disagreement most likely related to BC shape (need to look at coating & size information from SP2)

CalNex 2010 Campaign Overview BCSO4NO3NH4ChlHOAOOA -NR PM1 associated with BC particles is ~ 20 % (lower limit – more calibrations on the way) -The fraction of SO4 associated with BC is significantly lower than the fraction of organics associated with BC HR-AMS (4 ± 2 ug/m3) (SP2) SP-AMS (0.8 ± 0.5 ug/m3)

Air Mass Classification based on BC loading & location LA Basin LA Basin Up to 4 ug/m3 BC near shore (LA Port, Long Beach) Up to 1 ug/m3 BC off-shore air (Santa Monica bight) Northern California Northern California ug/m3 BC (SF Bay, San Pablo Bay, & Sacramento river) Marine Marine < 0.1 ug/m3 BC (clean marine and/or very old polluted air)

Aerosol Aging Frameworks (HR-AMS) Aging moves the aerosol towards lower H/C & higher O/C values [Ng et al., ACPD, 2011] LA Basin = aerosol ranging from fresh to aged Clean Marine = moderately to aged aerosol Northern California = moderately aged aerosol II I

PM 1 composition and size distribution, LA basin I) LA Port emissions / Long Beach outflow (May 26, 0500 UTC to May 27, 1900 UTC) * NW winds clean air S and S-SE winds, polluted air S and S-SE winds, polluted air (port and port/urban)

I ) May –1030 UTC, LA Port + Long Beach (SE) (O/C = 0.2; H/C = 1.6) 26 % of ORG 4 % of SO4 4 % of SO4 associated w/ BC associated w/ BC HOA and SV-OOA HOA and SV-OOA dominate ORG HRSP

II ) Santa Monica Bay May 16, UTC ( variable winds, mainly NE) * FLEXPART surface res. time Coastal outflow event driven by land breeze to Santa Monica bay and Los Angeles bight (one of many events)

II ) Santa Monica Bay (O/C = 0.55; H/C = 1.28) 12 % of ORG 12 % of ORG 9 % of SO4 9 % of SO4 25 % of NO3 25 % of NO3 associated w/ BC associated w/ BC LVOOA > SV-OOA HRSP

Particle Volatility Quantify coating material removed as function of temperature (volatile PM comes off first) -ORG, NO3 are volatile; SO4 becomes volatile at T > 150 C - Thermal denuded information useful for optical properties (optical absorption enhancement) SPHR

R/V Miller Freeman “experiment” “The influence of operating speed on gas and particle-phase shipping emissions: results from the R/V Miller Freeman” C. D. Cappa et al., ES&T, submitted, 2011 EF from SP-AMS are in good agreement with other EF estimates

Conclusions and future work We characterized a variety of air masses downwind port sources and urban areas along coastal California. The combination of SP2, HR-AMS and SP-AMS offered a unique opportunity to characterize refractory and non refractory PM during Our preliminary result indicate that ~20% of the PM1 measured by ToF AMS (15% organics, 5% inorganics) was associated with BC during CalNex Numbers highly variable upon source type & location More exciting work left to do as we fully explore and combine the Guest Van instruments (credit to Tim Onasch)

Acknowledgements Edward Fortner (ARI) - laboratory SP-AMS calibrations Manjula Canagaratna (ARI) - PMF analysis John Jayne (ARI) - thermal denuder NOAA PMEL (Tim Bates, Trish Quinn, Derek Coffman, Jim Johnson and Drew Hamilton) WHOI R/V Atlantis crew NOAA Global Climate Change Program ($$$$$) contract # NA09AR

Extra Slides

Heavy Metals in Shipping Emissions

Schematic of the SP module Vaporization via intra-cavity pump laser (  = 1064 nm, 5-20  sec) Coatings evaporate first ( 1000 C) Ionization of vapour (core + coatings) by electron impact (EI) Detection (core + coatings) with Time-of-Flight mass spectrometry