DOI: 10.1002/gbc.20088
Scopus记录号: 2-s2.0-84883734616
论文题名: Intensive mixing along an island chain controls oceanic biogeochemical cycles
作者: Nishioka J ; , Nakatsuka T ; , Watanabe Y ; W ; , Yasuda I ; , Kuma K ; , Ogawa H ; , Ebuchi N ; , Scherbinin A ; , Volkov Y ; N ; , Shiraiwa T ; , Wakatsuchi M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 3 起始页码: 920
结束页码: 929
语种: 英语
英文关键词: biogeochemical cycle
; IPY-GEOTRACES
; iron
; islands chain mixing
; subarctic North Pacific
Scopus关键词: Biogeochemical cycle
; Chain mixing
; Intermediate waters
; IPY-GEOTRACES
; North Pacific
; Phytoplankton growth
; Seasonal variability
; Western North Pacific
; Biogeochemistry
; Chains
; Ecology
; Iron
; Phytoplankton
; Waterworks
; Mixing
; biogeochemical cycle
; biogeochemistry
; chlorophyll
; euphotic zone
; growth rate
; iron
; mixing
; nitrate
; nutrient availability
; nutrient limitation
; phytoplankton
; seasonal variation
; subarctic region
; tidal cycle
; water mass
; Kuril Islands
; Pacific Ocean
; Pacific Ocean (North)
; Pacific Ocean (Subarctic)
; Russian Federation
; Sakhalin
; Sea of Okhotsk
英文摘要: 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 (~ 800 m) 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. Key Points A section profile of Fe was measured from the Okhtosk Sea to the Pacific OceanWe demonstrate the role of mixing at Island chain on biogeochemical cycleWe reveal the HNLC water formation processes in the subarctic Pacific ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77575
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Low Temperature Science, Hokkaido University, N19W8, Kita-ku, Sapporo, Hokkaido 060-0819, Japan; Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan; Faculty of Earth Environmental Science, Hokkaido University, Sapporo, Japan; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan; Faculty of Fisheries Science, Hokkaido University, Hakodate, Japan; Far Eastern Regional Hydrometeorological Research Institute, Vladivostok, Russian Federation; Research Institute for Humanity and Nature, Kyoto, Japan
Recommended Citation:
Nishioka J,, Nakatsuka T,, Watanabe Y,et al. Intensive mixing along an island chain controls oceanic biogeochemical cycles[J]. Global Biogeochemical Cycles,2013-01-01,27(3)