fungal spores overwhelm biogenic organic aerosols in a midlatitudinal forest
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2016
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Abstract
Both primary biological aerosol particles (PBAPs) and oxidation products of
biogenic volatile organic compounds (BVOCs) contribute significantly to
organic aerosols (OAs) in forested regions. However, little is known about their
relative importance in diurnal timescales. Here, we report biomarkers of
PBAP and secondary organic aerosols (SOAs) for their diurnal variability in a
temperate coniferous forest in Wakayama, Japan. Tracers of fungal spores,
trehalose, arabitol and mannitol, showed significantly higher levels in
nighttime than daytime (p < 0.05), resulting from the nocturnal
sporulation under near-saturated relative humidity. On the contrary, BVOC
oxidation products showed higher levels in daytime than nighttime,
indicating substantial photochemical SOA formation. Using tracer-based
methods, we estimated that fungal spores account for 45 % of organic
carbon (OC) in nighttime and 22 % in daytime, whereas BVOC oxidation
products account for 15 and 19 %, respectively. To our knowledge, we
present for the first time highly time-resolved results that fungal spores
overwhelmed BVOC oxidation products in contributing to OA especially in
nighttime. This study emphasizes the importance of both PBAPs and SOAs in
forming forest organic aerosols.
| Reference Key |
zhu2016atmosphericfungal
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|---|---|
| Authors | ;C. Zhu;C. Zhu;C. Zhu;K. Kawamura;K. Kawamura;Y. Fukuda;Y. Fukuda;M. Mochida;M. Mochida;Y. Iwamoto;Y. Iwamoto |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-7497-2016
|
| URL | |
| Keywords |
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