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Isoprene production in the water column and sediment in Funka Bay, Hokkaido, Japan

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Title: Isoprene production in the water column and sediment in Funka Bay, Hokkaido, Japan
Authors: Ooki, Atsushi Browse this author →KAKEN DB
Miyashita, Naoya Browse this author
Umezawa, Sachi Browse this author
Tozawa, Manami Browse this author
Nosaka, Yuichi Browse this author →KAKEN DB
Nomura, Daiki Browse this author →KAKEN DB
Onishi, Hiroji Browse this author →KAKEN DB
Abe, Hiroto Browse this author →KAKEN DB
Takatsu, Tetsuya Browse this author →KAKEN DB
Keywords: phytoplankton
volatile organic compound (VOC)
coastal ocean
primary production
Issue Date: 21-Feb-2023
Publisher: Geochemical Society of Japan(日本地球化学会)
Journal Title: Geochemical journal
Volume: 56
Issue: 5
Start Page: 142
End Page: 150
Publisher DOI: 10.2343/geochemj.GJ22013
Abstract: We conducted shipboard observations in Funka Bay, Hokkaido, Japan, in 2015, 2016 and 2019 to observe temporal variations of isoprene (C5H8) concentration in water and sediment. We found increases in C5H8 concentrations below and within the euphotic zone, which were associated with chl-a peaks and changes in nutrient and dissolved oxygen (DO). We found a C5H8 peak in the subsurface layer within the euphotic zone at 20-30 m depth in May-June 2019 that coincided with a decrease in DO, suggesting that there was net oxygen consumption. We hypothesize that the rapid cycle of regenerated production in the subsurface layer in early summer resulted in C5H8 production (1.00-1.75 pmol (mu g chl-a) d(-1) at 30 m), decreased DO, relatively high chl-a levels, and nutrient depletion. We propose that C5H8 can be used as a new chemical parameter reflecting primary production, in addition to the common parameters of chlorophyll-a, nutrients, and oxygen. We attributed a C5H8 peak at the surface in May-June 2019 to photosynthetic production of C5H8 associated with new production, likely stimulated by the sporadic input of nutrients to the sea surface. In addition, this is the first study to report the presence of C5H8 in seafloor sediments. We found very high C5H8 concentrations in the sediment from the surface to 5 cm depth. We propose that C5H8 production and degradation by the bacterial community in coastal marine sediments are approximately in balance.
Type: article
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)

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