Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean
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 chemi...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/57659 2023-05-15T14:46:36+02:00 Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean Hioki, Nanako Kuma, Kenshi Morita, Yuichirou Sasayama, Ryouhei Ooki, Atsushi Kondo, Yoshiko Obata, Hajime Nishioka, Jun Yamashita, Youhei Nishino, Shigeto Kikuchi, Takashi Aoyama, Michio http://hdl.handle.net/2115/57659 https://doi.org/10.1038/srep06775 eng eng Nature Publishing Group http://hdl.handle.net/2115/57659 Scientific reports, 4: 6775 http://dx.doi.org/10.1038/srep06775 http://creativecommons.org/licenses/by/4.0/ CC-BY 660 article fthokunivhus https://doi.org/10.1038/srep06775 2022-11-18T01:03:21Z 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. Article in Journal/Newspaper Arctic Arctic Ocean Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Arctic Arctic Ocean Scientific Reports 4 1 |
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Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
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fthokunivhus |
language |
English |
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660 |
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660 Hioki, Nanako Kuma, Kenshi Morita, Yuichirou Sasayama, Ryouhei Ooki, Atsushi Kondo, Yoshiko Obata, Hajime Nishioka, Jun Yamashita, Youhei Nishino, Shigeto Kikuchi, Takashi Aoyama, Michio Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean |
topic_facet |
660 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Hioki, Nanako Kuma, Kenshi Morita, Yuichirou Sasayama, Ryouhei Ooki, Atsushi Kondo, Yoshiko Obata, Hajime Nishioka, Jun Yamashita, Youhei Nishino, Shigeto Kikuchi, Takashi Aoyama, Michio |
author_facet |
Hioki, Nanako Kuma, Kenshi Morita, Yuichirou Sasayama, Ryouhei Ooki, Atsushi Kondo, Yoshiko Obata, Hajime Nishioka, Jun Yamashita, Youhei Nishino, Shigeto Kikuchi, Takashi Aoyama, Michio |
author_sort |
Hioki, Nanako |
title |
Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean |
title_short |
Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean |
title_full |
Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean |
title_fullStr |
Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean |
title_full_unstemmed |
Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean |
title_sort |
laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the arctic ocean |
publisher |
Nature Publishing Group |
url |
http://hdl.handle.net/2115/57659 https://doi.org/10.1038/srep06775 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_relation |
http://hdl.handle.net/2115/57659 Scientific reports, 4: 6775 http://dx.doi.org/10.1038/srep06775 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/srep06775 |
container_title |
Scientific Reports |
container_volume |
4 |
container_issue |
1 |
_version_ |
1766317797664620544 |