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Investigating Sources and Sinks of Organic Aerosols: NO₃ initiated Oxidation of Isoprene and Heterogeneous Oxidation of Organic Aerosol

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Table 1. Initial conditions and results for yield experiments     Date  T (K)  RH (%)  ,HC (ppb)  a 3 ,M o  ("g/m 3 )  b 3 SOA Yield (%)   8/9/07  294  5.1  101.6 ± 0.6  68.1 ± 1.1  23.8 ± 0.5  8/10/07  293  4.7  30.2 ± 0.1  11.5 ± 0.4  13.5 ± 0.5  8/1
Table 2.  SOA products identified using UPLC/(")ESI-TOFMS.  Retention  Time  (min) Measured [M " H]"Ion (m/z) TOFMS Suggested   [M " H]" Ion  Formula Error  (mDa, ppm) Measured           [M " H + C2H4O2]"Ion (m/z) TOFMS      Sug
Table 4. Global estimation of isoprene using GEOS-Chem  Emission Model    GEIAaMEGANb Isoprene emission (Tg/y) 507 389  Global isoprene burden (Tg) 1.7 1.7  Isoprene lifetime (days) 1.2 1.6  Isoprene reacted (Tg/y) by Isoprene + OH 407 304  Isoprene + O 36
Figure 1.  3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Mass conc. (!g/m 3) 200150100500 Time (min)2.52.01.51.00.5Volume conc
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