Ozonolysis of α‐pinene at atmospherically relevant concentrations: Temperature dependence of aerosol mass fractions (yields)

Ravi K Pathak; Charles O Stanier; Neil M Donahue; Spyros N Pandis

doi:10.1029/2006JD007436

$Ozonolysis of α‐pinene at atmospherically relevant concentrations: Temperature dependence of aerosol mass fractions (yields)$

Journal article

Peer reviewed

Ozonolysis of α‐pinene at atmospherically relevant concentrations: Temperature dependence of aerosol mass fractions (yields)

Ravi K Pathak, Charles O Stanier, Neil M Donahue and Spyros N Pandis

Journal of Geophysical Research: Atmospheres, Vol.112(D3), pp.D03201-n/a

02/16/2007

DOI: 10.1029/2006JD007436

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Abstract

Despite a number of smog chamber studies of the α‐pinene/O3 system, the effect of temperature on α‐pinene secondary organic aerosol (SOA) mass fractions (or yields) remains poorly understood. In this study, the temperature dependence of secondary organic aerosol mass fractions (AMF) during ozonolysis of α‐pinene is investigated in a temperature controlled smog chamber. Experiments were performed with and without ammonium sulfate aerosol seeds at RH < 10% and at 0°C, 15°C, 20°C, 30°C and 40°C. The initial α‐pinene concentration varied from 3.5 to 50 ppb, and an excess of ozone was used. High time resolution secondary organic AMFs were obtained combining continuous gas‐phase concentration measurements (using proton transfer reaction mass spectrometry, PTR‐MS) with continuous aerosol concentration measurements (using a scanning mobility particle sizer, SMPS). The presence of inert aerosol seeds is often necessary to minimize experimental errors due to loss of semivolatile vapors to the walls of the chamber. The α‐pinene secondary organic AMFs show a weak dependence on temperature in the 15° to 40°C range and stronger temperature dependence in the 0° and 15°C range.

SOA

aerosol yield

biogenic aerosol

Details

Title: Subtitle: Ozonolysis of α‐pinene at atmospherically relevant concentrations: Temperature dependence of aerosol mass fractions (yields)
Creators: Ravi K Pathak - Carnegie Mellon University
Charles O Stanier - University of Iowa
Neil M Donahue - Carnegie Mellon University
Spyros N Pandis - University of Patras
Resource Type: Journal article
Publication Details: Journal of Geophysical Research: Atmospheres, Vol.112(D3), pp.D03201-n/a
DOI: 10.1029/2006JD007436
ISSN: 0148-0227
eISSN: 2156-2202
Number of pages: 8
Language: English
Date published: 02/16/2007
Academic Unit: Chemical and Biochemical Engineering
Record Identifier: 9984003433602771

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