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北海道噴火湾におけるブロモホルム分布の季節変動

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Title: 北海道噴火湾におけるブロモホルム分布の季節変動
Other Titles: Seasonal variations of bromoform distribution in the Funka Bay
Authors: 大木, 淳之1 Browse this author →KAKEN DB
三輪, 一爾2 Browse this author
大西, 広二3 Browse this author →KAKEN DB
亀井, 佳彦4 Browse this author
小林, 直人5 Browse this author →KAKEN DB
久万, 健志6 Browse this author →KAKEN DB
Authors(alt): Ooki, Atsushi1
Miwa, Kazuji2
Onishi, Hiroji3
Kamei, Yoshihiko4
Kobayashi, Naoto5
Kuma, Kenshi6
Keywords: Halocarbon
Macro algae
Phytoplankton
Seawater
Issue Date: Dec-2013
Publisher: 日本分析化学会
Journal Title: 分析化学
Journal Title(alt): Bunseki Kagaku
Volume: 62
Issue: 12
Start Page: 1071
End Page: 1078
Publisher DOI: 10.2116/bunsekikagaku.62.1071
Abstract: 2011年10月から2012年8月まで約2か月ごとに北海道噴火湾(内浦湾)で海洋観測を行った.海岸と沿岸,海盆域で海水を採取し揮発性有機ハロゲン化合物(ハロカーボン)の濃度をガスクロマトグラフ質量分析計にて測定した.海洋が主要起源と考えられているブロモホルムの濃度分布を捉え,同一水塊での濃度変化から起源推定を行った.植物プランクトンの大増殖が起こる3月から4月にかけて噴火湾海盆域では,ブロモホルムの濃度が約1.3倍になった(上昇率5 pmol L-1 month-1).この上昇は植物プランクトンによるブロモホルム生産によるものと考えられた.海岸付近の大型藻類の成長が活発になる4月から8月は,海岸付近でブロモホルム濃度が急上昇してから高濃度域が湾全体に広がり,海盆域平均で濃度が約1.7倍になった(上昇率4 pmol L-1 month-1).この上昇は大型藻類によるブロモホルム生産によるものと考えられた.噴火湾のブロモホルム濃度の変化は植物プランクトンと大型藻類の両方の影響を受けることが分かった.
A shipboard observation was conducted in Funka Bay of Hokkaido from October 2011 to August 2012. Volatile organic halogenated compounds (halocarbons) in seawater collected at coastal, basin and sea shore sampling sites were measured by purge and trap GC-MS method. The spatial and temporal distributions of bromoform (CHBr3) were obtained, and we analyzed the origin of the compound. The minimum concentration of bromoform (15 pmol L−1) was found in December. The bromoform concentration in the basin area increased from 20 pmol L−1 to 25 pmol L−1 at a rate of 5 pmol L−1 month−1 during the phytoplankton spring bloom period (March-April). This increase would have been derived from the phytoplankton production of bromoform. The concentration increased from April to August at a rate of 4 pmol L−1 month−1, and the maximum concentration of 42 pmol L−1 in basin area was found in August. Much higher concentrations were found in the coastal area (125 pmol L−1) and the sea shore (up to 1800 pmol L−1). The late summer bromoform maximum found in the basin area would be derived from macro algal production near the sea shore.
Type: article
URI: http://hdl.handle.net/2115/54677
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大木 淳之

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