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| Titel |
Organosulfates and organic acids in Arctic aerosols: speciation, annual variation and concentration levels |
| VerfasserIn |
A. M. K. Hansen, K. Kristensen, Q. T. Nguyen, A. Zare, F. Cozzi, J. K. Nøjgaard, H. Skov, J. Brandt, J. H. Christensen, J. Ström, P. Tunved, R. Krejci, M. Glasius |
| 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. 15 ; Nr. 14, no. 15 (2014-08-07), S.7807-7823 |
| Datensatznummer |
250118924
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| Publikation (Nr.) |
 copernicus.org/acp-14-7807-2014.pdf |
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| Zusammenfassung |
| Sources, composition and occurrence of secondary organic aerosols in the
Arctic were investigated at Zeppelin Mountain, Svalbard, and Station Nord,
northeastern Greenland, during the full annual cycle of 2008 and 2010,
respectively. Speciation of organic acids, organosulfates and nitrooxy organosulfates – from both
anthropogenic and biogenic precursors were in focus. A total of 11 organic
acids (terpenylic acid, benzoic acid, phthalic acid, pinic acid, suberic
acid, azelaic acid, adipic acid, pimelic acid, pinonic acid, diaterpenylic
acid acetate and 3-methyl-1,2,3-butanetricarboxylic acid), 12 organosulfates
and 1 nitrooxy organosulfate were identified in aerosol samples from the
two sites using a high-performance liquid chromatograph (HPLC) coupled to
a quadrupole Time-of-Flight mass spectrometer. At Station Nord, compound
concentrations followed a distinct annual pattern, where high mean
concentrations of organosulfates (47 ± 14 ng m−3) and organic
acids (11.5 ± 4 ng m−3) were observed in January, February and
March, contrary to considerably lower mean concentrations of organosulfates
(2 ± 3 ng m−3) and organic acids (2.2 ± 1 ng m−3)
observed during the rest of the year. At Zeppelin Mountain, organosulfate and
organic acid concentrations remained relatively constant during most of the
year at a mean concentration of 15 ± 4 ng m−3 and
3.9 ± 1 ng m−3, respectively. However during four weeks of
spring, remarkably higher concentrations of total organosulfates
(23–36 ng m−3) and total organic acids (7–10 ng m−3) were
observed. Elevated organosulfate and organic acid concentrations coincided
with the Arctic haze period at both stations, where northern Eurasia was
identified as the main source region. Air mass transport from northern
Eurasia to Zeppelin Mountain was associated with a 100% increase in the
number of detected organosulfate species compared with periods of air mass
transport from the Arctic Ocean, Scandinavia and Greenland. The results from
this study suggested that the presence of organic acids and organosulfates at
Station Nord was mainly due to long-range transport, whereas indications of
local sources were found for some compounds at Zeppelin Mountain.
Furthermore, organosulfates contributed significantly to organic matter throughout the
year at Zeppelin Mountain (annual mean of 13 ± 8%) and during
Arctic haze at Station Nord (7 ± 2%), suggesting organosulfates to
be important compounds in Arctic aerosols. |
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