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| Titel |
Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse |
| VerfasserIn |
K. Hara, F. Nakazawa, S. Fujita, K. Fukui, H. Enomoto, S. Sugiyama |
| 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. 18 ; Nr. 14, no. 18 (2014-09-25), S.10211-10230 |
| Datensatznummer |
250119065
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| Publikation (Nr.) |
 copernicus.org/acp-14-10211-2014.pdf |
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| Zusammenfassung |
| Measurements of aerosol number concentrations and direct aerosol sampling
were conducted on continental Antarctica during the traverse of the
Japanese–Swedish joint Antarctic expedition (JASE) from 14 November 2007
until 24 January 2008. Aerosol concentrations in background conditions
decreased gradually with latitude in inland regions during the traverse. The
lowest aerosol number concentrations were 160 L−1 in Dp
> 0.3 μm, and 0.5 L−1 in Dp 2 μm.
In contrast, aerosol concentrations reached 3278 L−1 in Dp > 0.3 μm, and 215 L−1 in Dp > 2 μm
under strong wind conditions. The estimated aerosol mass concentrations were
0.04–5.7 μg m−3. Single particle analysis of aerosol particles
collected during the JASE traverse was conducted using a scanning electron
microscope equipped with an energy dispersive x ray spectrometer. Major
aerosol constituents were sulfates in fine mode, and sulfate, sea salts,
modified sea salts, and fractionated sea salts in coarse mode. K-rich
sulfates, Mg-rich sulfate, Ca-rich sulfates, and minerals were identified as
minor aerosol constituents. Horizontal features of Cl / Na ratios imply that
sea-salt modification (i.e. Cl loss) occurred on the Antarctic continent
during the summer. Most sea-salt particles in the continental region near
the coast were modified with acidic sulfur species such as H2SO4
and CH3SO3H. By contrast, acidic species other than the acidic
sulfur species (likely HNO3) contributed markedly to sea-salt
modification in inland areas during the traverse. Mg-rich sea-salt particles
and Mg-free sea-salt particles were present in coarse and fine modes from
the coast to inland areas. These sea-salt particles might be associated with
sea-salt fractionation on the snow surface of continental Antarctica. |
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