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Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean

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Title: Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean
Authors: Hioki, Nanako Browse this author
Kuma, Kenshi Browse this author →KAKEN DB
Morita, Yuichirou Browse this author
Sasayama, Ryouhei Browse this author
Ooki, Atsushi Browse this author →KAKEN DB
Kondo, Yoshiko Browse this author
Obata, Hajime Browse this author →KAKEN DB
Nishioka, Jun Browse this author →KAKEN DB
Yamashita, Youhei Browse this author →KAKEN DB
Nishino, Shigeto Browse this author
Kikuchi, Takashi Browse this author
Aoyama, Michio Browse this author
Issue Date: 27-Oct-2014
Publisher: Nature Publishing Group
Journal Title: Scientific reports
Volume: 4
Start Page: 6775
Publisher DOI: 10.1038/srep06775
Abstract: The location and magnitude of oceanic iron sources remain uncertain owing to a scarcity of data, particularly in the Arctic Ocean. The formation of cold, dense water in the subsurface layer of the western Arctic Ocean is a key process in the lateral transport of iron, macronutrients, and other chemical constituents. Here, we present iron, humic-like fluorescent dissolved organic matter, and nutrient concentration data in waters above the continental slope and shelf and along two transects across the shelf-basin interface in the western Arctic Ocean. We detected high concentrations in shelf bottom waters and in a plume that extended in the subsurface cold dense water of the halocline layer in slope and basin regions. At sigma(theta) = 526.5, dissolved Fe, humic-like fluorescence intensity, and nutrient maxima coincided with N* minima (large negative values of N* indicate significant denitrification within shelf sediments). These results suggest that these constituents are supplied from the shelf sediments and then transported laterally to basin regions. Humic dissolved organic matter probably plays the most important role in the subsurface maxima and lateral transport of dissolved Fe in the halocline layer as natural Fe-binding organic ligand.
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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