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| Titel |
Latitudinal distributions of organic nitrogen and organic carbon in marine aerosols over the western North Pacific |
| VerfasserIn |
Y. Miyazaki, K. Kawamura, J. Jung, H. Furutani, M. Uematsu |
| 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 ; 11, no. 7 ; Nr. 11, no. 7 (2011-04-01), S.3037-3049 |
| Datensatznummer |
250009578
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| Publikation (Nr.) |
 copernicus.org/acp-11-3037-2011.pdf |
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| Zusammenfassung |
| Marine aerosol samples were collected over the western North Pacific along
the latitudinal transect from 44° N to 10° N in late summer 2008 for
measurements of organic nitrogen (ON) and organic carbon (OC) as well as
isotopic ratios of total nitrogen (TN) and total carbon (TC). Increased
concentrations of methanesulfonic acid (MSA) and diethylammonium (DEA+)
at 40–44° N and subtropical regions (10–20° N) together with
averaged satellite chlorophyll-a data and 5-day back trajectories suggest a
significant influence of marine biological activities on aerosols in these
regions. ON exhibited increased concentrations up to 260 ngN m−3 in
these marine biologically influenced aerosols. Water-insoluble organic
nitrogen (WION) was found to be the most abundant nitrogen in the aerosols,
accounting for 55 ± 16% of total aerosol nitrogen. In particular, the
average WION/ON ratio was as high as 0.93 ± 0.07 at 40–44° N. These
results suggest that marine biological sources significantly contributed to
ON, a majority of which is composed of water-insoluble fractions in the
study region. Analysis of the stable carbon isotopic ratios (δ13C) indicated that, on average, marine-derived carbon accounted for
~88 ± 12% of total carbon in the aerosols. In addition, the
δ13C showed higher values (from −22 to −20‰) when ON/OC
ratios increased from 0.15 to 0.35 in marine biologically influenced
aerosols. These results clearly show that organic nitrogen is enriched in
organic aerosols originated from an oceanic region with high biological
productivity, indicating a preferential transfer of nitrogen-containing
organic compounds from the sea surface to the marine atmosphere. Both WION
concentrations and WION/water-insoluble organic carbon (WIOC) ratios tended
to increase with increasing local wind speeds, indicating that sea-to-air
emissions of ON via sea spray contribute significantly to the marine organic
aerosols over the study region. |
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