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西部北太平洋亜寒帯海域における酸性海霧の発生要因

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Title: 西部北太平洋亜寒帯海域における酸性海霧の発生要因
Other Titles: Factors of sea fog acidification over the western subarctic North Pacific region
Authors: 植松, 光夫1 Browse this author
Authors(alt): Uematsu, Mitsuo1
Issue Date: 31-Mar-2010
Publisher: 北海道大学低温科学研究所
Citation: 大気圏と生物圏の相互利用. 北海道大学低温科学研究所編
Journal Title: 低温科学
Journal Title(alt): Low Temperature Science
Volume: 68
Start Page: 49
End Page: 52
Abstract: 西部北太平洋亜寒帯域は霧の多発する海域である. 海霧のpHは2.8-5.5と酸性を示し, 粒径分布は陸上の霧の一山型とは異なり, 霧粒の直径は7.0μmと27.5μmにピークを持つ二山型であった. エアロゾルと海霧のイオン成分の比較から, 硝酸イオンを含む粗大粒子が, 霧によって選択的に除去される事を明らかにした. これは大気経由の人為起源窒素化合物が海霧により海洋へ供給され, 海洋生態系へ影響を与えていることを示唆する.
Chemical and physical properties of sea fog over the sub-arctic North Pacific regions were determined. The mean size distribution of liquid water content (LWC) of sea fog indicated two peaks, which was different from the common single modal spectra of terrestrial fog. The mean pH values of fog water ranged from 2.8 to 5.5 over the investigated regions. Nitrate existed as coarse particles acts as condensation nuclei (CN) of sea fog droplets. These results suggest that sea fog over the subarctic North Pacific is one of important scavengers of natural and anthropogenic substances transported from the Asian continent and atmospheric nitrogen deposition to the marine environment may stimulate phytoplankton growth.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/45163
Appears in Collections:低温科学 = Low Temperature Science > 第68巻

Submitter: 低温科学研究所図書室

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