Thermal-Denuder + AMS Measurements

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Presentation transcript:

Thermal-Denuder + AMS Measurements Alex Huffman, Ingrid Ulbrich, and Jose-Luis Jimenez University of Colorado-Boulder FLAME Meeting at CSU, 22-Feb-07

Rapid Chemistry + Volatility Analysis Ambient Air HR-ToF-AMS Thermal Denuder Mexico City 2006 Huffman et al.

Thermal Denuder + HR-ToF-AMS A. Huffman et al., CU Boulder

Evaporation in a Thermal Denuder Simple Model: 1) allow a (400 nm radius) particle to evaporate for 9 seconds 2) ignore diffusion (influence gets included w/ specified p0(T)) 3) assume particle composed of 1-7 individual components (each with unique DHvap and p0(T)) 25 °C 100 °C 200 °C From Chris Cappa, NOAA ESRL

Evaporation in a Thermal Denuder ● Model cannot reproduce observations using only one or two components with reasonable thermodynamics Huffman et al. DH = 100 kJ/mol DH = 30 kJ/mol DH = 10 kJ/mol DH = 5 kJ/mol ● However, observations can be nearly matched using just a single component (even better for two) in a highly parameterized way Chris Cappa, NOAA, Paul Ziemann (UCR) Alex Huffman (CU)

Evaporation in a Thermal Denuder 88 kJ/mol < DHvap < 156 kJ/mol ● Observed trends in organics can be (potentially) explained via a multi-component “liquid-like” model with reasonable thermodynamics Huffman et al. 7-component ● No unique solution ● Necessary to have non-volatile component Chris Cappa, NOAA, Paul Ziemann (UCR) Alex Huffman (CU)

Montana TD-AMS

Montana TD-AMS II T50

Distribution of Volatilities (T50) Urban HOA Urban OOA Volatility of Urban POA/HOA is big issue => also for BBOA

Volatility vs. Organic Fraction I

Volatility vs. Organic Fraction II

Character of Organic Spectra Hydrocarbon-Like OA HOA Oxygenated OA OOA Montana Biomass OA BBOA

Volatility vs. Organic Spectrum

Volatility vs. Organic Spectrum II

Summary of TD-AMS TD-AMS: chemically resolved volatility Interpret ~ distribution of Pvap and DHvap Smoke volatility varied widely Most were more volatile than urban aerosols Volatility is correlated w/ chemical character Organic fraction Character of the organic spectrum Spectra change with temperature Ongoing analysis