Relative abundance and opal input of radiolarians measured on sediment core PS1768-8 and PS2498-1

DOI

We present a new proxy, the oxygen isotope measurements (d18O) of radiolarian opal from sediment cores in the Subantarctic Zone (SAZ) and Permanent Open Ocean Zone (POOZ) of the Atlantic Southern Ocean. The SAZ core records of radiolarian and foraminiferal d18O are well correlated. In the POOZ core, only radiolarian 18O shifts to distinctly lower values during the glacial (when this core was in the Sea Ice Zone (SIZ)), while relevant foraminiferal and diatomaceous d18O records exhibit no such shift. This suggests a seasonal salinity change derived from the melting of snow accumulated on sea ice. We propose that a northward relocation of the Southern Ocean zonal system and enhanced water-vapor transport from lower latitudes forced the development of a stratified sea-surface in the northern SIZ during late glacial spring time. This raises unexpected aspects for numerical modeling of past atmospheric coupling and moisture transport, as well as on glacial Southern Ocean stratification and its implication for ocean/atmosphere gas exchange, water mass generation and productivity.

Data submitted 2009-06-11; set to protected on request of first author (2014-08-13, PDI-8220).

Identifier
DOI https://doi.org/10.1594/PANGAEA.719184
Related Identifier https://doi.org/10.1016/j.dsr.2008.12.019
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.719184
Provenance
Creator Abelmann, Andrea ORCID logo
Publisher PANGAEA
Publication Year 2009
Rights Licensing unknown: Please contact principal investigator/authors to gain access and request licensing terms; Data access is restricted (moratorium, sensitive data, license constraints)
OpenAccess false
Representation
Resource Type Publication Series of Datasets; Collection
Format application/zip
Size 4 datasets
Discipline Earth System Research
Spatial Coverage (-14.228W, -52.593S, 4.476E, -44.153N); Shona Ridge; South Atlantic
Temporal Coverage Begin 1989-11-11T21:40:00Z
Temporal Coverage End 1993-12-24T06:58:00Z