Evidence of formation of submicrometer water‐soluble organic aerosols at a deciduous forest site in northern Japan in summer
Identifieur interne : 000365 ( Main/Exploration ); précédent : 000364; suivant : 000366Evidence of formation of submicrometer water‐soluble organic aerosols at a deciduous forest site in northern Japan in summer
Auteurs : Yuzo Miyazaki [Japon] ; Jinsang Jung [Japon, Corée du Sud] ; Pingqing Fu [Japon, République populaire de Chine] ; Yasuko Mizoguchi [Japon] ; Katsumi Yamanoi [Japon] ; Kimitaka Kawamura [Japon]Source :
- Journal of Geophysical Research: Atmospheres [ 0148-0227 ] ; 2012-10-16.
Abstract
Semicontinuous measurements of submicrometer water‐soluble organic aerosols and particle size distributions were conducted at a deciduous forest site in northern Japan in August 2010. Increases in particle number concentration were frequently observed in daytime, accompanied by an increase in the concentrations of water‐soluble organic carbon (WSOC). We found that daily averaged WSOC concentrations positively correlated with gross primary production of CO2 by the forest ecosystem (r2 = 0.63) and ambient temperature during daytime. These relations suggest that the formation of WSOC is closely linked to photosynthetic activity by the forest ecosystem, which depends on both temperature and solar radiation. Off‐line chemical analysis of samples of particles with aerodynamic diameter smaller than 1 μm collected during a 2 day event of elevated WSOC levels suggests that photochemical aging of both α‐ andβ‐pinene and isoprene oxidation products contributes to the particle growth and the WSOC mass. Organic tracers of primary biological aerosol particles (PBAPs) showed distinct diurnal variations with a maximum around noontime, also indicating that higher temperature and light intensity induce emissions of PBAPs. However, their contribution to the submicrometer WSOC mass was likely insignificant. During the day, the concentrations of 3‐methyl‐1,2,3‐butanetricarboxylic acid (3‐MBTCA) showed a strong dependence on temperature, and the ratios of WSOC to particle volume concentration increased with an increase in the concentration ratios of 3‐MBTCA to pinonic acid (PA). This result supports a previous proposal that the 3‐MBTCA/PA ratios in submicrometer particles can be a useful tracer for chemical aging of biogenic secondary organic aerosol from forest vegetation.
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DOI: 10.1029/2012JD018250
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Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2012-10-16">2012-10-16</date><biblScope unit="volume">117</biblScope><biblScope unit="issue">D19</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">9D892DFB9EF11470FA11B1F60E9C3F184E63EF2C</idno><idno type="DOI">10.1029/2012JD018250</idno><idno type="ArticleID">2012JD018250</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Semicontinuous measurements of submicrometer water‐soluble organic aerosols and particle size distributions were conducted at a deciduous forest site in northern Japan in August 2010. Increases in particle number concentration were frequently observed in daytime, accompanied by an increase in the concentrations of water‐soluble organic carbon (WSOC). We found that daily averaged WSOC concentrations positively correlated with gross primary production of CO2 by the forest ecosystem (r2 = 0.63) and ambient temperature during daytime. These relations suggest that the formation of WSOC is closely linked to photosynthetic activity by the forest ecosystem, which depends on both temperature and solar radiation. Off‐line chemical analysis of samples of particles with aerodynamic diameter smaller than 1 μm collected during a 2 day event of elevated WSOC levels suggests that photochemical aging of both α‐ andβ‐pinene and isoprene oxidation products contributes to the particle growth and the WSOC mass. Organic tracers of primary biological aerosol particles (PBAPs) showed distinct diurnal variations with a maximum around noontime, also indicating that higher temperature and light intensity induce emissions of PBAPs. However, their contribution to the submicrometer WSOC mass was likely insignificant. During the day, the concentrations of 3‐methyl‐1,2,3‐butanetricarboxylic acid (3‐MBTCA) showed a strong dependence on temperature, and the ratios of WSOC to particle volume concentration increased with an increase in the concentration ratios of 3‐MBTCA to pinonic acid (PA). This result supports a previous proposal that the 3‐MBTCA/PA ratios in submicrometer particles can be a useful tracer for chemical aging of biogenic secondary organic aerosol from forest vegetation.</div></front></TEI><affiliations><list><country><li>Corée du Sud</li><li>Japon</li><li>République populaire de Chine</li></country><settlement><li>Pékin</li></settlement></list><tree><country name="Japon"><noRegion><name sortKey="Miyazaki, Yuzo" sort="Miyazaki, Yuzo" uniqKey="Miyazaki Y" first="Yuzo" last="Miyazaki">Yuzo Miyazaki</name></noRegion><name sortKey="Fu, Pingqing" sort="Fu, Pingqing" uniqKey="Fu P" first="Pingqing" last="Fu">Pingqing Fu</name><name sortKey="Jung, Jinsang" sort="Jung, Jinsang" uniqKey="Jung J" first="Jinsang" last="Jung">Jinsang Jung</name><name sortKey="Kawamura, Kimitaka" sort="Kawamura, Kimitaka" uniqKey="Kawamura K" first="Kimitaka" last="Kawamura">Kimitaka Kawamura</name><name sortKey="Miyazaki, Yuzo" sort="Miyazaki, Yuzo" uniqKey="Miyazaki Y" first="Yuzo" last="Miyazaki">Yuzo Miyazaki</name><name sortKey="Mizoguchi, Yasuko" sort="Mizoguchi, Yasuko" uniqKey="Mizoguchi Y" first="Yasuko" last="Mizoguchi">Yasuko Mizoguchi</name><name sortKey="Yamanoi, Katsumi" sort="Yamanoi, Katsumi" uniqKey="Yamanoi K" first="Katsumi" last="Yamanoi">Katsumi Yamanoi</name></country><country name="Corée du Sud"><noRegion><name sortKey="Jung, Jinsang" sort="Jung, Jinsang" uniqKey="Jung J" first="Jinsang" last="Jung">Jinsang Jung</name></noRegion></country><country name="République populaire de Chine"><noRegion><name sortKey="Fu, Pingqing" sort="Fu, Pingqing" uniqKey="Fu P" first="Pingqing" last="Fu">Pingqing Fu</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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