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| Titel |
Daily and hourly chemical impact of springtime transboundary aerosols on Japanese air quality |
| VerfasserIn |
T. Moreno, T. Kojima, F. Amato, F. Lucarelli, J. Rosa, G. Calzolai, S. Nava, M. Chiari, A. Alastuey, X. Querol, W. Gibbons |
| 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 ; 13, no. 3 ; Nr. 13, no. 3 (2013-02-04), S.1411-1424 |
| Datensatznummer |
250017637
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| Publikation (Nr.) |
 copernicus.org/acp-13-1411-2013.pdf |
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| Zusammenfassung |
| The regular eastward drift of transboundary aerosol intrusions from the
Asian mainland into the NW Pacific region has a pervasive impact on air
quality in Japan, especially during springtime. Analysis of 24-h filter
samples with Inductively Coupled Plasma Atomic Emission Spectroscopy
(ICP-AES) and Mass Spectrometry (ICP-MS), and hourly Streaker with Particle
Induced X-ray Emission (PIXE) samples collected continuously for six weeks
reveal the chemistry of successive waves of natural mineral desert dust
("Kosa") and metalliferous sulphatic pollutants arriving in western Japan
during spring 2011. The main aerosol sources recognised by Positive Matrix
Factorization (PMF) analysis of Streaker data are mineral dust and fresh sea
salt (both mostly in the coarser fraction PM2.5–10), As-bearing
sulphatic aerosol (PM0.1–2.5), metalliferous sodic particulate matter
(PM) interpreted as aged, industrially contaminated marine aerosol, and
ZnCu-bearing aerosols. Whereas mineral dust arrivals are typically highly
transient, peaking over a few hours, sulphatic intrusions build up and
decline more slowly, and are accompanied by notable rises in ambient
concentrations of metallic trace elements such as Pb, As, Zn, Sn and Cd. The
magnitude of the loss in regional air quality due to the spread and
persistence of pollution from mainland Asia is especially clear when
cleansing oceanic air advects westward across Japan, removing the
continental influence and reducing concentrations of the undesirable
metalliferous pollutants by over 90%. Our new chemical database,
especially the Streaker data, demonstrates the rapidly changing complexity
of ambient air inhaled during these transboundary events, and implicates
Chinese coal combustion as the main source of the anthropogenic aerosol
component. |
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