Winter-time dissolved iron and nutrient distributions in the Subantarctic Zone from 40-52S; 155-160E

被引：49

作者：

Ellwood, Michael J. ^{[1
]}

Boyd, Philip W. ^{[2
]}

Sutton, Philip ^{[3
]}

机构：

[1] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia

[2] Univ Otago, Dept Chem, Natl Inst Water & Atmospher Res, Ctr Chem & Phys Oceanog, Dunedin, New Zealand

[3] Natl Inst Water & Atmospher Res, Wellington, New Zealand

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 11期

关键词：

D O I：

10.1029/2008GL033699

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

In HNLC oceanic regions, iron (Fe) controls phytoplankton productivity yet large gaps remain in our understanding of iron's biogeochemical cycle. Here we present the first comprehensive winter dataset for dissolved Fe (dFe) and nitrate (NO3) distributions (0-1000 m depth) between 40S-52S, which transects the Subantarctic zone (SAZ), west of New Zealand. Surface concentrations (<0.2 nmol Fe kg(-1)) were conspicuously low, i.e., probably biologically limiting even at winter-reserve levels, at frontal zones between 43S (Subtropical Front) and similar to 51S (Subantarctic Front). A fivefold range in Fe: NO3 molar ratios was observed along the transect, with Subtropical waters, where blooms occur, having the highest ratios in subsurface waters. The major wintertime supply of dFe in the SAZ is from Ekman advection of waters from the south (but calculated source water dFe is similar to 0.2 nmol Fe kg similar to 1), suggesting that mixed-layer dFe concentration is controlled by how long these southern waters remain at the surface (similar to 3 years).

引用

页数：6

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