期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 49, 期 17, 页码 10330-10339出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b02031
关键词
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资金
- NSF [AGS-1243354, 1243356, 1247421, 1246918]
- NOAA [NA13OAR4310063]
- DOE (BER/ASR) [DE-SC0011105]
- CIRES
- CU Graduate School
- EPA STAR [FP-91770901-0]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1246918, 1243354, 1247421] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1628530, 1243356] Funding Source: National Science Foundation
Gas-phase low volatility organic compounds (LVOC), produced from oxidation of isoprene 4-hydroxy-3-hydroperoxide (4,3-ISOPOOH) under low-NO conditions, were observed during the FIXCIT chamber study. Decreases in LVOC directly correspond to appearance and growth in secondary organic aerosol (SOA) of consistent elemental composition, indicating that LVOC condense (at OA below 1 mu g m(-3)). This represents the first simultaneous measurement of condensing low volatility species from isoprene oxidation in both the gas and particle phases. The SOA formation in this study is separate from previously described isoprene epoxydiol (IEPDX) uptake. Assigning all condensing LVOC signals to 4,3-ISOPOOH oxidation in the chamber study implies a wall-loss corrected non-IEPDX SOA mass yield of similar to 4%. By contrast to monoterpene oxidation, in which extremely low volatility VOC (ELVOC) constitute the organic aerosol, in the isoprene system LVOC with saturation concentrations from 10(-2) to 10 mu g m(-3) are the main constituents. These LVOC may be important for the growth of nanoparticles in environments with low OA concentrations. LVOC observed in the chamber were also observed in the atmosphere during SOAS-2013 in the Southeastern United States, with the expected diurnal cycle. This previously uncharacterized aerosol formation pathway could account for similar to 5.0 Tg yr(-1) of SOA production, or 3.3% of global SOA.
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