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| Titel |
Stable Carbon Isotope Ratio of OC and TC in Aerosol Particles at Urban, Marine and Forest Sites |
| VerfasserIn |
Agne Masalaite, Ulrike Dusek, Rupert Holzinger, Thomas Röckmann, Vidmantas Remeikis |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100834
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| Publikation (Nr.) |
 EGU/EGU2014-16836.pdf |
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| Zusammenfassung |
| Atmospheric aerosols contain up to 50 % (of) organic substances, thus substantially
contributing to aerosol climate forcing and affecting human health. In addition to health and
climate impacts, aerosol particulate matter is increasingly recognized for its role in
biogeochemical cycles. δ13C value of carbonaceous aerosols is a useful tracer for
distinguishing the origin of carbonaceous materials. Stable carbon isotope ratios were
determined for organic carbon (OC) fraction and total carbon (TC) of PM1 collected on
quartz fiber filters in Lithuania in March 2013 at three sites: the urban location of Vilnius, the
coastal location of Preila and forest location of Rugsteliskis. The isotope values varied
from -27.5 o to -25.5 o for OC and -27.9 o to -25.4 o for TC. δ13C values of
TC of the marine site were depleted with some exceptions, at the forest site they
were most enriched and the values of the city were in between. The city had the
narrowest variation in TC indicating one main source of aerosol particles. The situation
was different for OC values. δ13C values of the marine and the forest sites were
relatively depleted, meanwhile the city site values were enriched and OC had a highest
variability (1.6 o). The city samples had the best correlation (TC via OC). The marine
values varied over a wide range (1.5 o) compared to the forest ones. The difference
between TC and OC was not as high at the marine and city sites as at the forest
site (the variation was about 5 times larger - the average OC was 1 o depleted).
This indicates that VOC had a different origin than TC in the forest and in the city.
Meanwhile marine aerosol particles had more or less the same source of OC and
TC. |
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