HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Institute of Low Temperature Science >
Peer-reviewed Journal Articles, etc >

Seasonal variation of levoglucosan in aerosols over the western North Pacific and its assessment as a biomass-burning tracer

Files in This Item:
AE44-29_3511-3518.pdf1.63 MBPDFView/Open
Please use this identifier to cite or link to this item:

Title: Seasonal variation of levoglucosan in aerosols over the western North Pacific and its assessment as a biomass-burning tracer
Authors: Mochida, Michihiro Browse this author
Kawamura, Kimitaka Browse this author →KAKEN DB
Fu, Pingqing Browse this author
Takemura, Toshihiko Browse this author
Keywords: Levoglucosan
Biomass-burning aerosol
Long-range transport
Organic carbon
Molecular marker
Issue Date: Sep-2010
Publisher: Elsevier
Journal Title: Atmospheric Environment
Volume: 44
Issue: 29
Start Page: 3511
End Page: 3518
Publisher DOI: 10.1016/j.atmosenv.2010.06.017
Abstract: Levoglucosan is considered as a useful molecular tracer of biomass-burning aerosols in the atmosphere. To characterize the seasonal variation of its concentrations over the Pacific Ocean and to assess its usefulness as a tracer after long-range transport, we investigated long-term variations of levoglucosan over Chichi-jima in the western North Pacific, from 2001 to 2004. Organic carbon (OC), elemental carbon (EC) and D-glucose were analyzed for comparison. The seasonal variation of levoglucosan concentrations shows a maximum in the winter, which is consistent with the enhanced Asian outflow to the Pacific indicated by backward air-mass trajectories. The concentration levels of levoglucosan estimated from global aerosol model outputs in the winter are, on average, comparable to the observed levels, suggesting that a considerable fraction of levoglucosan did not decompose during long-range transport from the Asian continent by westerly/northwesterly winds. This result is supported by comparable ratios of levoglucosan to EC in Chichi-jima and the East Asian coastal region. Conversely, the measured concentrations of levoglucosan in the summer are significantly lower than the modeled one. This implies a degradation of levoglucosan in the air masses that stagnated over the Pacific, although uncertainties in the model estimate may also be partly responsible for this discrepancy. One possible degradation pathway is oxidation by OH radicals; the contribution of acid-catalyzed reactions needs further investigation.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河村 公隆

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University