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| Titel |
Chemical characterization of biogenic secondary organic aerosol generated from plant emissions under baseline and stressed conditions: inter- and intra-species variability for six coniferous species |
| VerfasserIn |
C. L. Faiola, M. Wen, T. M. VanReken |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 7 ; Nr. 15, no. 7 (2015-04-01), S.3629-3646 |
| Datensatznummer |
250119610
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| Publikation (Nr.) |
 copernicus.org/acp-15-3629-2015.pdf |
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| Zusammenfassung |
| The largest global source of secondary organic aerosol (SOA) in the atmosphere is
derived from the oxidation of biogenic emissions. Plant stressors associated
with a changing environment can alter both the quantity and composition of
the compounds that are emitted. Alterations to the biogenic volatile organic compound (BVOC) profile
could impact the characteristics of the SOA formed from those emissions.
This study investigated the impacts of one global change stressor, increased
herbivory, on the composition of SOA derived from real plant emissions.
Herbivory was simulated via application of methyl jasmonate (MeJA), a proxy
compound. Experiments were repeated under pre- and post-treatment conditions
for six different coniferous plant types. Volatile organic compounds (VOCs) emitted from the plants were
oxidized to form SOA via dark ozone-initiated chemistry. The SOA
chemical composition was measured using a Aerodyne high-resolution time-of-flight
aerosol mass spectrometer (HR-AMS). The aerosol mass spectra
of pre-treatment biogenic SOA from all plant types tended to be similar with
correlations usually greater than or equal to 0.90. The presence of a
stressor produced characteristic differences in the SOA mass spectra.
Specifically, the following m/z were identified as a possible biogenic
stress AMS marker with the corresponding HR ion(s) shown in parentheses: m/z
31 (CH3O+), m/z 58 (C2H2O2+,
C3H6O+), m/z 29 (C2H5+), m/z 57
(C3H5O+), m/z 59 (C2H3O2+,
C3H7O+), m/z 71 (C3H3O2+,
C4H7O+), and m/z 83 (C5H7O+). The first
aerosol mass spectrum of SOA generated from the oxidation of the plant
stress hormone, MeJA, is also presented. Elemental analysis
results demonstrated an O : C range of baseline biogenic SOA between 0.3 and 0.47.
The O : C of standard MeJA SOA was 0.52. Results presented here
could be used to help identify a biogenic plant stress marker in ambient
data sets collected in forest environments. |
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