(Table 1) Water column silicic acid concentrations and Si isotopic composition during Marion Dufresne cruise MD166 off South Africa ...

Silicon isotopic signatures (d30Si) of water column silicic acid (Si(OH)4) were measured in the Southern Ocean, along a meridional transect from South Africa (Subtropical Zone) down to 57° S (northern Weddell Gyre). This provides the first reported data of a summer transect across the whole Antarcti...

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Bibliographic Details
Main Authors: Fripiat, François, Cavagna, Anne-Julie, Dehairs, Frank, Speich, Sabrina, André, Luc, Cardinal, Damien
Format: Dataset
Language:English
Published: PANGAEA 2011
Subjects:
Event label
Date/Time of event
Latitude of event
Longitude of event
DEPTH, water
Silicic acid
δ30Si, silicic acid
δ30Si, error
Sample comment
CTD/Rosette
Colorimetry
Multi-collector inductively coupled plasma mass spectrometer MC-ICP-MS
MD166
Marion Dufresne 1995
Global marine biogeochemical cycles of trace elements and their isotopes GEOTRACES
International Polar Year 2007-2008 IPY
Antarc*
Antarctic
International Polar Year
IPY
Southern Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.809699
https://doi.pangaea.de/10.1594/PANGAEA.809699
Description
Summary:Silicon isotopic signatures (d30Si) of water column silicic acid (Si(OH)4) were measured in the Southern Ocean, along a meridional transect from South Africa (Subtropical Zone) down to 57° S (northern Weddell Gyre). This provides the first reported data of a summer transect across the whole Antarctic Circumpolar Current (ACC). d30Si variations are large in the upper 1000 m, reflecting the effect of the silica pump superimposed upon meridional water transfer across the ACC: the transport of Antarctic surface waters northward by a net Ekman drift and their convergence and mixing with warmer upper-ocean Si-depleted waters to the north. Using Si isotopic signatures, we determine different mixing interfaces: the Antarctic Surface Water (AASW), the Antarctic Intermediate Water (AAIW), and thermoclines in the low latitude areas. The residual silicic acid concentrations of end-members control the d30Si alteration of the mixing products and with the exception of AASW, all mixing interfaces have a highly Si-depleted ... : Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...

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