First survey of Antarctic sub-ice shelf sediments reveals mid-Holocene iceshelf retreat

Citation
Cj. Pudsey et J. Evans, First survey of Antarctic sub-ice shelf sediments reveals mid-Holocene iceshelf retreat, GEOLOGY, 29(9), 2001, pp. 787-790
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGY
ISSN journal
0091-7613 → ACNP
Volume
29
Issue
9
Year of publication
2001
Pages
787 - 790
Database
ISI
SICI code
0091-7613(200109)29:9<787:FSOASS>2.0.ZU;2-V
Abstract
The retreat of five small Antarctic Peninsula ice shelves in the late 20th century has been related to regional (possibly anthropogenic) climate warmi ng. We use the record of ice-rafted debris (IRD) in cores to show that the Prince Gustav Channel ice shelf also retreated in mid-Holocene time. Early and late Holocene-age sediments contain IRD derived entirely from local ice drainage basins, which fed the section of ice shelf covering each site. Co re-top and mid-Holocene (5-2 ka) sediments include a wider variety of rock types, recording the drift of far-traveled icebergs, which implies seasonal ly open water at the sites. The period when the Prince Gustav ice shelf was absent corresponds to regional climate warming deduced from other paleoenv ironmental records. We infer that the recent decay cannot be viewed as an u nequivocal indicator of anthropogenic climate perturbation.