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Organic tracers of primary biological aerosol particles at subtropical Okinawa Island in the western North Pacific Rim

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Title: Organic tracers of primary biological aerosol particles at subtropical Okinawa Island in the western North Pacific Rim
Authors: Zhu, Chunmao Browse this author
Kawamura, Kimitaka Browse this author →KAKEN DB
Kunwar, Bhagawati Browse this author
Keywords: primary biological aerosol particles
fungal spores
Asian outflow
Issue Date: 17-Jun-2015
Publisher: American Geophysical Union
Journal Title: Journal of geophysical research atmospheres
Volume: 120
Issue: 11
Start Page: 5504
End Page: 5523
Publisher DOI: 10.1002/2015JD023611
Abstract: Primary biological aerosol particles (PBAPs) play an important role in affecting atmospheric physical and chemical properties. Aerosol samples were collected at Cape Hedo, Okinawa Island, Japan, from October 2009 to February 2012 and analyzed for five primary saccharides and four sugar alcohols as PBAP tracers. We detected high levels of sucrose in spring when blossoming of plants happens and prolifically emits pollen to the air. Concentrations of glucose, fructose, and trehalose showed levels higher than the other saccharides in spring in 2010. In comparison, primary saccharide levels were mutually comparable in spring, summer, and autumn in 2011, indicating the interannual variability of their local production in subtropical forests, which is driven by local temperature and radiation. High trehalose events were found to be associated with Asian dust outflows, indicating that Asian dust also contributes to PBAPs at Okinawa. Sugar alcohols peaked in summer and correlated with local precipitation and temperature, indicating high microbial activities. Positive matrix factorization analysis confirmed that the PBAPs are mainly derived from local vegetation, pollen, and fungal spores. A higher contribution of PBAP tracers to water-soluble organic carbon (WSOC) was found in summer (14.9%). The annual mean ambient loadings of fungal spores and PBAPs were estimated as 0.49 mu gm(-3) and 4.12 mu gm(-3), respectively, using the tracer method. We report, for the first time, year-round biomarkers of PBAP and soil dust and their contributions to WSOC in the subtropical outflow region of the Asian continent.
Rights: Copyright 2015 American Geophysical Union.
Type: article
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

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