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Temporal variability and bioavailability of iron and other nutrients during the spring phytoplankton bloom in the Oyashio region

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タイトル: Temporal variability and bioavailability of iron and other nutrients during the spring phytoplankton bloom in the Oyashio region
著者: Nakayama, Yuta 著作を一覧する
Kuma, Kenshi 著作を一覧する
Fujita, Satoshi 著作を一覧する
Sugie, Koji 著作を一覧する
Ikeda, Tsutomu 著作を一覧する
キーワード: Iron
Spring phytoplankton bloom
Vertical water mixing
Coastal Oyashio Water
Oyashio region
Northwestern North Pacific
発行日: 2010年 9月
出版者: Elsevier
誌名: Deep Sea Research Part II: Topical Studies in Oceanography
巻: 57
号: 17-18
開始ページ: 1618
終了ページ: 1629
出版社 DOI: 10.1016/j.dsr2.2010.03.006
抄録: Iron [dissolved Fe (D-Fe) and total dissolvable Fe (T-Fe)] and nutrient concentrations in the surface water of the Oyashio region (northwestern North Pacific) were measured before and during spring phytoplankton bloom (March to May in 2007). During the pre-bloom period (middle of March), we observed vertically uniform concentrations of iron (0.3-0.5 nM [D-Fe] and 3-5 nM [T-Fe]), macronutrients (10-15 μM NO3+NO2, 1.0-1.5 μM PO4 and 20-30 μM Si(OH)4) and chlorophyll a (Chl-a, 0.3-0.4 μg ^[-1]) throughout the upper 125 to 150 m due to vertical mixing during winter. Water temperature and salinity before the bloom were also vertically uniform with > 5℃ and S > 33.5, the conditions of a modified Kuroshio warm-water (MKW) ring, higher than those of the Coastal Oyashio Water (COW). The cold COW ( < 2℃, S < 33.2) intruded a few times into the surface during the bloom period with high iron (0.4-0.6 nM [D-Fe] and 10-25 nM [T-Fe]) and Chl-a (10-23 μg l^[-1]) concentrations. The high Chl-a observed in the COW is due to the higher original concentrations of iron and macronutrients in the COW than in the MKW. An incubation experiment conducted during a COW intrusion in early April resulted in robust phytoplankton growth and complete exhaustion of nutrients, indicating an adequate supply of bioavailable iron. This result is also consistent with robust in situ phytoplankton growth and Chl-a production due to the presence of high iron levels in the COW. The most important mechanisms transporting iron to the surface water, which would regulate the primary production during spring bloom in the Oyashio region, are the surface intrusions of iron- and nutrient-rich COW derived from vertical and lateral mixing processes and vertical mixing in MKW during winter and spring.
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 久万 健志


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