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| Titel |
Molecular composition of sugars in atmospheric particulate matter from interior Alaska |
| VerfasserIn |
Md. Mozammel Haque, Kimitaka Kawamura, Yongwon Kim |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250101020
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| Publikation (Nr.) |
 EGU/EGU2015-107.pdf |
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| Zusammenfassung |
| Sugars can account for 0.5-8% of carbon in atmospheric particulate matter, affecting the
earth climate, air quality and public health. Total of 33 total suspended particle
(TSP) samples were collected from Fairbanks, Alaska in June 2008 to June 2009
using a low volume air sampler. Here, we report the molecular characteristics of
anhydro-sugars (levoglucosan, galactosan and mannosan), primary saccharides (xylose,
fructose, glucose, sucrose and trehalose) and sugar alcohols (erythritol, arabitol,
mannitol and inositol). The average contribution of sugars to the organic carbon (OC)
was also determined to be 0.92%. Sugar compounds were measured using solvent
extraction/TMS-derivatization technique followed by gas chromatography-mass spectrometry
(GC-MS) determination. The concentrations of total quantified sugar compounds ranged
from 2.3 to 453 ng m-3 (average 145 ng m-3). The highest concentration was
recorded for levoglucosan in summer, with a maximum concentration of 790 ng m-3
(average 108 ng m-3). Levoglucosan, which is specifically formed by a pyrolysis of
cellulose, has been used as an excellent tracer of biomass burning. The highest level of
levoglucosan indicates a significant contribution of biomass burning in ambient aerosols.
Galactosan (average 20 ng m-3) and mannosan (average 27 ng m-3), which are also
formed through the pyrolysis of cellulose/hemicelluloses, were identified in all
samples. The average concentrations of arabitol, mannitol, glucose and sucrose
were also found 14.7, 14.6, 14.1 and 16.8 ng m-3, respectively. They have been
proposed as tracers for resuspension of surface soil and unpaved road dust, which
contain biological materials including fungi and bacteria. These results suggest that
there is some impact of bioaerosols on climate over Interior Alaska. We will also
measure water-soluble organic carbon (WSOC) and inorganic ions for all samples. |
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