New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean ...

The silicon isotope composition of silicic acid, delta Si-30(OH)(4), in the deep Arctic Ocean is anomalously heavy compared to all other deep ocean basins. To further evaluate the mechanisms leading to this condition, delta Si-30(OH)(4) was examined on US GEOTRACES section GN01 from the Bering Strai...

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Bibliographic Details
Main Authors: Brzezinski, Mark A., Closset, Ivia, Jones, Janice L., de Souza, Gregory F., Maden, Colin
Format: Text
Language:English
Published: ETH Zurich 2021
Subjects:
nutrients
biogeochemical cycles
diatoms
silicon isotopes
Arctic ocean
Geotraces
stable isotope Si30
Arctic Ocean
Bering Strait
canada basin
Chukchi
Chukchi Sea
North Pole
Online Access:https://dx.doi.org/10.3929/ethz-b-000505293
http://hdl.handle.net/20.500.11850/505293
Description
Summary:The silicon isotope composition of silicic acid, delta Si-30(OH)(4), in the deep Arctic Ocean is anomalously heavy compared to all other deep ocean basins. To further evaluate the mechanisms leading to this condition, delta Si-30(OH)(4) was examined on US GEOTRACES section GN01 from the Bering Strait to the North Pole. Isotope values in the polar mixed layer showed a strong influence of the transpolar drift. Drift waters contained relatively high [Si(OH)(4)] with heavy delta Si-30(OH)(4) consistent with the high silicate of riverine source waters and strong biological Si(OH)(4) consumption on the Eurasian shelves. The maximum in silicic acid concentration, [Si(OH)(4)], within the double halocline of the Canada Basin formed a local minimum in delta Si-30(OH)(4) that extended across the Canada Basin, reflecting the high-[Si(OH)(4)] Pacific source waters and benthic inputs of Si(OH)(4) in the Chukchi Sea. delta Si-30(OH)(4) became lighter with the increase in [Si(OH)(4)] in intermediate and deep waters; ... : Frontiers in Marine Science, 8 ...

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