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| Titel |
Seasonal variations of water-soluble organic carbon, dicarboxylic acids, ketocarboxylic acids, and α-dicarbonyls in Central Himalayan aerosols |
| VerfasserIn |
P. Hegde, K. Kawamura |
| 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 ; 12, no. 14 ; Nr. 12, no. 14 (2012-07-26), S.6645-6665 |
| Datensatznummer |
250011349
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| Publikation (Nr.) |
 copernicus.org/acp-12-6645-2012.pdf |
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| Zusammenfassung |
| Aerosol samples were collected from a high elevation
mountain site (Nainital, India; 1958 m a.s.l.) in the central Himalayas, a
location that provides an isolated platform above the planetary boundary
layer to better understand the composition of the remote continental
troposphere. The samples were analyzed for water-soluble dicarboxylic acids
(C2-C12) and related compounds (ketocarboxylic acids and α-dicarbonyls),
as well as organic carbon, elemental carbon and water
soluble organic carbon. The contributions of total dicarboxylic acids to
total aerosol carbon during wintertime were 1.7% and 1.8%, for day and
night, respectively whereas they were significantly smaller during summer.
Molecular distributions of diacids revealed that oxalic (C2) acid was
the most abundant species followed by succinic (C4) and malonic
(C3) acids. The average concentrations of total diacids
(433±108 ng m−3), ketoacids (48±23 ng m−3), and α-dicarbonyls
(9±4 ng m−3) were similar to those from large
Asian cities such as Tokyo, Beijing and Hong Kong. During summer most of the
organic species were several times more abundant than in winter. Phthalic
acid, which originates from oxidation of polycyclic aromatic hydrocarbons
such as naphthalene, was found to be 7 times higher in summer than winter.
This feature has not been reported before in atmospheric aerosols. Based on
molecular distributions and air mass backward trajectories, we conclude that
dicarboxylic acids and related compounds in Himalayan aerosols are derived
from anthropogenic activities in the highly populated Indo-Gangetic plain
areas. |
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