Imperial College London
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ProfessorTinavan de Flierdt

Faculty of Engineering, Department of Earth Science & Engineering

Head of the Department of Earth Science and Engineering
 
 
 
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Contact

 

+44 (0)20 7594 1290tina.vandeflierdt

 
 
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Location

 

G.30Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bertram:2018:10.1016/j.epsl.2018.04.054,
author = {Bertram, RA and Wilson, DJ and van, de Flierdt T and McKay, RM and Patterson, MO and Jimenez-Espejo, FJ and Escutia, C and Duke, G and Taylor-Silva, B and Riesselman, C},
doi = {10.1016/j.epsl.2018.04.054},
journal = {Earth and Planetary Science Letters},
pages = {109--116},
title = {Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica},
url = {http://dx.doi.org/10.1016/j.epsl.2018.04.054},
volume = {494},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Significantly reduced ice coverage in Greenland and West Antarctica during the warmer-than-present Pliocene could account for ~10m of global mean sea level rise. Any sea level increase beyond this wouldrequire contributions from the East Antarctic Ice Sheet (EAIS). Previous studies have presented low-resolution geochemical  evidence from the geological record, suggesting repeated ice advance and retreat inlow-lying areas of the EAIS such as the Wilkes Subglacial Basin. However, the rates and mechanisms of retreat events are less well constrained. Here we present orbitally-resolved marine detrital sediment provenance data, paired with ice-rafted debris and productivity proxies, during three time intervals from the middle to latePliocene at IODP Site U1361A, offshore of the Wilkes Subglacial Basin. Our new data reveal that Pliocene shifts in sediment provenance were paralleled by increases in marine productivity, while the onset of such changes was marked by peaks in ice-rafted debris mass accumulation rates. The coincidence of sediment provenance and marine productivity change argues against a switch in sediment delivery between ice streams, and instead suggests that deglacial warming triggered increased rates of iceberg calving, followed byinland retreat of the ice margin. Timescales from the onset of deglaciation to an inland retreated ice margin within the Wilkes Subglacial Basin are on the order of several thousand years. This geological evidence corroborates retreat rates determined from ice sheet modelling, and a contribution of ~3 to 4m of equivalent sea level rise from one of the most vulnerable areas of the East Antarctic Ice Sheet during interglacial intervals throughout the middleto late Pliocene.
AU  - Bertram,RA
AU  - Wilson,DJ
AU  - van,de Flierdt T
AU  - McKay,RM
AU  - Patterson,MO
AU  - Jimenez-Espejo,FJ
AU  - Escutia,C
AU  - Duke,G
AU  - Taylor-Silva,B
AU  - Riesselman,C
DO  - 10.1016/j.epsl.2018.04.054
EP  - 116
PY  - 2018///
SN  - 0012-821X
SP  - 109
TI  - Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica
T2  - Earth and Planetary Science Letters
UR  - http://dx.doi.org/10.1016/j.epsl.2018.04.054
UR  - http://hdl.handle.net/10044/1/59325
VL  - 494
ER  -
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