Intensive mixing along an island chain controls oceanic biogeochemical cycles

Nishioka, Jun; Nakatsuka, Takeshi; Watanabe, Yutaka W.; Yasuda, Ichiro; Kuma, Kenshi; Ogawa, Hiroshi; Ebuchi, Naoto; Scherbinin, Alexey; Volkov, Yuri N.; Shiraiwa, Takayuki; Wakatsuchi, Masaaki

Intensive mixing along an island chain controls oceanic biogeochemical cycles

Nishioka, Jun; Nakatsuka, Takeshi; Watanabe, Yutaka W. et al.

Global biogeochemical cycles, 2013, 27(3), 920-929

Permalink : https://hdl.handle.net/2115/54810

このアイテムのアクセス数:1,321件（2026-08-12 17:51 集計）

閲覧可能ファイル

ファイル	フォーマット	サイズ	閲覧回数	説明
gbc20088	pdf	3.14 MB	1,185

論文情報

ファイル出力 EndNote Basic出力 Mendeley出力

アクセス権	open access
URI	https://hdl.handle.net/2115/54810
タイトル	Intensive mixing along an island chain controls oceanic biogeochemical cycles
著者	Nishioka, Jun ; Nakatsuka, Takeshi ; Watanabe, Yutaka W. ; Yasuda, Ichiro ; Kuma, Kenshi ; Ogawa, Hiroshi ; Ebuchi, Naoto ; Scherbinin, Alexey ; Volkov, Yuri N. ; Shiraiwa, Takayuki ; Wakatsuchi, Masaaki
e-Rad_Researcher 90371533 著者名 Nishioka, Jun
e-Rad_Researcher 60242880 著者名 Nakatsuka, Takeshi
e-Rad_Researcher 90333640 著者名 Watanabe, Yutaka W.
e-Rad_Researcher 80270792 著者名 Yasuda, Ichiro
e-Rad_Researcher 30205158 著者名 Kuma, Kenshi
e-Rad_Researcher 50260518 著者名 Ogawa, Hiroshi
e-Rad_Researcher 10203655 著者名 Ebuchi, Naoto
著者名 Scherbinin, Alexey
著者名 Volkov, Yuri N.
e-Rad_Researcher 90235739 著者名 Shiraiwa, Takayuki
e-Rad_Researcher 60002101 著者名 Wakatsuchi, Masaaki
言語	英語
キーワード	iron
	islands chain mixing
	biogeochemical cycle
	subarctic North Pacific
	IPY-GEOTRACES
発行日	2013-09
出版者	Amer geophysical union
収録物名	Global biogeochemical cycles
巻(号)	27(3)
ページ	920-929
記述	Copyright 2013 American Geophysical Union.
抄録	The subarctic Pacific is a high-nutrient low-chlorophyll (HNLC) region in which phytoplankton growth is broadly limited by iron (Fe) availability. However, even with Fe limitation, the western subarctic Pacific (WSP) has significant phytoplankton growth and greater seasonal variability in lower trophic levels than the eastern subarctic Pacific. Therefore, differences in Fe supply must explain the west-to-east decrease in seasonal phytoplankton growth. The Fe flux to the euphotic zone in the WSP occurs at a moderate value, in that it is significantly higher than its value on the eastern side, yet it is not sufficient enough to cause widespread macronutrient depletion, that is, HNLC status is maintained. Although we recognize several Fe supply processes in the WSP, the mechanisms that account for this moderate value of Fe supply have not previously been explained. Here we demonstrate the pivotal role of tidal mixing in the Kuril Islands chain (KIC) for determining the moderate value. A basin-scale meridional Fe section shows that Fe derived from sediments in the Sea of Okhotsk is discharged through the KIC into the intermediate water masses (similar to 800m) of the western North Pacific. The redistribution of this Fe-rich intermediate water by intensive mixing as it crosses the KIC is the predominant process determining the ratio of micronutrient (Fe) to macronutrients (e.g., nitrate) in subsurface waters. This ratio can quantitatively explain the differences in surface macronutrient consumption between the western and eastern subarctic, as well as the general formation and biogeochemistry of HNLC waters of the subarctic North Pacific.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
PISSN	0886-6236
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1002/gbc.20088