Isoprene production in seawater of Funka Bay, Hokkaido, Japan

Ooki, Atsushi; Shida, Ryuta; Otsu, Masashi; Onishi, Hiroji; Kobayashi, Naoto; Iida, Takahiro; Nomura, Daiki; Suzuki, Kota; Yamaoka, Hideyoshi; Takatsu, Tetsuya

Isoprene production in seawater of Funka Bay, Hokkaido, Japan

Ooki, Atsushi; Shida, Ryuta; Otsu, Masashi et al.

Journal of Oceanography, 2019, 75(6), 485-501

Permalink : https://hdl.handle.net/2115/79856

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アクセス権	open access
URI	https://hdl.handle.net/2115/79856
タイトル	Isoprene production in seawater of Funka Bay, Hokkaido, Japan
著者	Ooki, Atsushi ; Shida, Ryuta ; Otsu, Masashi ; Onishi, Hiroji ; Kobayashi, Naoto ; Iida, Takahiro ; Nomura, Daiki ; Suzuki, Kota ; Yamaoka, Hideyoshi ; Takatsu, Tetsuya
e-Rad_Researcher 70450252 著者名 Ooki, Atsushi
著者名 Shida, Ryuta
著者名 Otsu, Masashi
e-Rad_Researcher 80241371 著者名 Onishi, Hiroji
e-Rad_Researcher 00250506 著者名 Kobayashi, Naoto
e-Rad_Researcher 90455189 著者名 Iida, Takahiro
e-Rad_Researcher 70550739 著者名 Nomura, Daiki
著者名 Suzuki, Kota
著者名 Yamaoka, Hideyoshi
e-Rad_Researcher 50241378 著者名 Takatsu, Tetsuya
言語	英語
キーワード	Volatile organic compound (VOC)
	Phytoplankton
	Bloom
	Photosynthesis
	Dark production
	C5H8
	Hydrocarbon
発行日	2019-12
収録物名	Journal of Oceanography
巻(号)	75(6)
ページ	485-501
抄録	We carried out shipboard observations in Funka Bay, Hokkaido, Japan, monthly or bimonthly from December 2015 to November 2016. We measured vertical profiles of isoprene, chlorophyll-a (chl-a), and other parameters from surface to bottom layer (about 95 m) near the center of the bay. We found substantial increases in isoprene concentration in the surface mixed layer from February to March during the peak of the spring diatom bloom, in the bottom layer from March to April after the peak of the bloom, and in the subsurface layer (below the surface mixed layer) in summer from July to August, where there were also substantial chl-a concentration maxima. We attribute the increased isoprene in the surface and subsurface layers to photosynthetic production of isoprene by the dominant phytoplankton in the spring bloom and in summer, and that in the bottom layer to dark production of isoprene by diatom aggregates that settled from the surface euphotic zone. We also measured isoprene production in laboratory incubation experiments. The rates of in situ production of isoprene per unit chl-a in the surface mixed layer during the spring bloom, in the dark bottom layer during the bloom, and in the subsurface layer in summer (0.82, 0.03–0.13, and 7.38 pmol (μg chl-a)^−1 day^−1, respectively) were consistent with our incubation results. We believe that this is the first report focused on dark production of isoprene by diatoms; the rate of isoprene production under dark conditions ranged from 4% to 16% of that by photosynthesis.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	This is a post-peer-review, pre-copyedit version of an article published in Journal of Oceanography. The final authenticated version is available online at: https://dx.doi.org/10.1007/s10872-019-00517-6
PISSN	0916-8370
EISSN	1573-868X
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1007/s10872-019-00517-6