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Water column iron dynamics in the subarctic North Pacific Ocean and the Bering Sea

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Title: Water column iron dynamics in the subarctic North Pacific Ocean and the Bering Sea
Authors: Uchida, Ren Browse this author
Kuma, Kenshi Browse this author →KAKEN DB
Omata, Aya Browse this author
Ishikawa, Satoko Browse this author
Hioki, Nanako Browse this author
Ueno, Hiromichi Browse this author →KAKEN DB
Isoda, Yutaka Browse this author →KAKEN DB
Sakaoka, Keiichiro Browse this author →KAKEN DB
Kamei, Yoshihiko Browse this author
Takagi, Shohgo Browse this author
Issue Date: Mar-2013
Publisher: Amer Geophysical Union
Journal Title: Journal of Geophysical Research: Oceans
Volume: 118
Issue: 3
Start Page: 1257
End Page: 1271
Publisher DOI: 10.1002/jgrc.20097
Abstract: We measured water-column iron concentrations from west to east along 47 degrees N in the subarctic North Pacific, and in the Bering Sea. In the North Pacific dissolved Fe (D-Fe) showed surface depletion, mid-depth maxima at 1000-1500 m (west, 1.3-1.6 nM; east, 0.9-1.1 nM), and a gradual decrease with depth below 3500-4000 m depth (west, 1.1-1.4 nM; east, 0.6-0.7 nM). D-Fe and total soluble Fe (T-Fe) in deep water showed a decreasing trend eastward. The higher iron concentrations in western deep waters probably result from higher inputs of dissolved Fe through atmospheric deposition or lateral transport. In contrast, D-Fe throughout the Bering Sea showed a consistent depth regime characterized by a rapid increase with depth to mid-depths, a gradual increase with depth in intermediate water to a maximum of 1.6-1.7 nM at 1500-2250 m, and a gradual decrease with depth to 1.3-1.4 nM at 3700 m. Higher iron concentrations and deeper D-Fe maxima in the Bering Sea are likely due to higher biological productivity and greater and deeper D-Fe input from the decomposition of sinking particulate organic matter in deep water. We suggest that the higher concentrations and deeper input of D-Fe as well as PO4 and humic-type fluorescent dissolved organic matter in the Bering Sea probably results from the longer time for the accumulation of decomposition products resulting from iron supply from the organic-rich downslope sediment along the steep continental slopes and slow replacement of the deep water in the Bering Sea Basin.
Rights: Copyright 2013 American Geophysical Union.
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)

Submitter: 久万 健志

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