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| Titel |
Airborne characterization of smoke marker ratios from prescribed burning |
| VerfasserIn |
A. P. Sullivan, A. A. May, T. Lee, G. R. McMeeking, S. M. Kreidenweis, S. K. Akagi, R. J. Yokelson, S. P. Urbanski, J. L. Jr. Collett |
| 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 ; 14, no. 19 ; Nr. 14, no. 19 (2014-10-09), S.10535-10545 |
| Datensatznummer |
250119082
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| Publikation (Nr.) |
 copernicus.org/acp-14-10535-2014.pdf |
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| Zusammenfassung |
| A Particle-Into-Liquid Sampler – Total Organic Carbon (PILS-TOC) and
fraction collector system was flown aboard a Twin Otter aircraft sampling
prescribed burning emissions in South Carolina in November 2011 to obtain
smoke marker measurements. The fraction collector provided 2 min
time-integrated offline samples for carbohydrate (i.e., smoke markers
levoglucosan, mannosan, and galactosan) analysis by high-performance
anion-exchange chromatography with pulsed amperometric detection. Each fire
location appeared to have a unique Δlevoglucosan/Δwater-soluble organic carbon (WSOC) ratio (RF01/RF02/RF03/RF05 =
0.163 ± 0.007 μg C μg−1 C, RF08 = 0.115
± 0.011 μg C μg−1 C, RF09A = 0.072 ±
0.028 μg C μg−1 C, and RF09B = 0.042 ± 0.008
μg C μg−1 C, where RF means research flight). These
ratios were comparable to those obtained from controlled laboratory burns and
suggested that the emissions sampled during RF01/F02/RF03/RF05 were dominated
by the burning of grasses, RF08 by leaves, RF09A by needles, and RF09B by
marsh grasses. These findings were further supported by the Δgalactosan/Δlevoglucosan ratios (RF01/RF02/RF03/RF05 = 0.067
± 0.004 μg μg−1, RF08 = 0.085 ± 0.009
μg μg−1, and RF09A = 0.101 ± 0.029
μg μg−1) obtained as well as by the ground-based fuel
and filter sample analyses during RF01/RF02/RF03/RF05. Differences between
Δpotassium/Δlevoglucosan ratios obtained for these
prescribed fires vs. laboratory-scale measurements suggest that some
laboratory burns may not accurately represent potassium emissions from
prescribed burns. The Δlevoglucosan/ΔWSOC ratio had no
clear dependence on smoke age or fire dynamics suggesting that this ratio is
more dependent on the type of fuel being burned. Levoglucosan was stable over
a timescale of at least 1.5 h and could be useful to help estimate the air
quality impacts of biomass burning. |
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