Deposition of Aerosols on Leaves in a Cool-temperate Larch Forest in Northern Hokkaido, Japan

被引:1
|
作者
Fukazawa Tatsuya
Murao Naoto
Sato Hisashi
Takahashi Masahiro
Akiyama Masayuki
Yamaguchi Takashi
Noguchi Izumi
Takahashi Hiroyuki
Kozuka Chikara
Sakai Rei
Takagi Kentaro
Fujinuma Yasumi
Saigusa Nobuko
Matsuda Kazuhide
机构
[1] Environmental & Geological Research Department,Institute of Environmental Sciences
[2] Hokkaido Research Organization N19 W12,Forest Research Station, Field Science Center for Northern Biosphere
[3] Hokkaido University,Department of Environmental Management
[4] Tottori University of Environmental Studies,Center for Global Environmental Research
[5] National Institute of Environmental Studies,Department of Environmental Systems
[6] Meisei University,Faculty of Engineering
[7] Hokkaido University,undefined
关键词
Deposition; Aerosol; Leaf; Hybrid larch; Sasa bamboo; Black carbon;
D O I
10.5572/ajae.2012.6.4.281
中图分类号
学科分类号
摘要
Aerosol concentrations at the CC-Lag site in the Teshio Experimental Forest increased from winter to spring and sometimes showed extremely high values associated with Kosa and/or forest-fire events. The range and mean of the mass concentrations of aerosol chemical species were as follows: total particulate mass, 1.2–29, 5.0; elemental carbon, 0.061–2.2, 0.43; organic carbon, 0.059–3.5, 0.79; and sulfate, 0.12–6.2, 1.8 μg/m3. The total masses of the deposited particles on hybrid larch and on bamboo leaves were approximately 35 and 30 μg/cm2, respectively. The amounts of soil particles on the leaves were 6 μg/cm2 for the upper part of hybrid larch, 2 μg/cm2 for the lower part of hybrid larch, and 1 μg/ cm2 for Sasa bamboo leaves. The amounts of deposited black carbon were 2.3 μg/cm2 for the upper part of hybrid larch, 0.6 μg/cm2 for the lower part of hybrid larch, and 0.2 μg/cm2 for Sasa bamboo leaves. Half of the total deposited particular mass was attached on the hybrid larch; however, most of the total deposited mass was adhered on the Sasa bamboo leaves. Regardless of the species, there tend to be more deposited particles on the leaves in the upper part than in the lower part, with only a few meters height difference. Comparing the composition of the deposited particles to that of the atmospheric aerosols without any size cut, the fractions of water-soluble material sulfate and sea salt in the deposited aerosols were about one tenth and one hundredth lower than that in the aerosols, respectively. On the basis of the measured concentration and the deposited amount on leaves, the deposition velocity of black carbon was estimated to be approximately 0.5 cm/s.
引用
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页码:281 / 287
页数:6
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