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

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

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3511604e&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 11, CiteID L11604

Mathematics

Logic

8

Oceanography: Biological And Chemical: Trace Elements (0489), Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Physical Chemistry, Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling (0470, 1050)

Scientific paper

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 ~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 ~0.2 nmol Fe kg-1), suggesting that mixed-layer dFe concentration is controlled by how long these southern waters remain at the surface (~3 years).

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