A chronology for the Dome C deep ice-core site through radio-echo layer correlation with the Vostok ice core, Antarctica

被引：35

作者：

Siegert, MJ ^{[1
]}

Hodgkins, R

Dowdeswell, JA

机构：

[1] Univ Wales, Inst Geog & Earth Sci, Ctr Glaciol, Aberystwyth SY23 3DB, Dyfed, Wales

[2] Univ London Royal Holloway & Bedford New Coll, Dept Geog, Egham TW20 0EX, Surrey, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 1998年 / 25卷 / 07期

关键词：

D O I：

10.1029/98GL00718

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Ice at the new Dome C drill site is correlated directly with the Vostok ice-core record using internal radio-echo layering in the Antarctic Ice Sheet. Layering observed on 60 MHz radar records at ice depths greater than 1000 m is a result of electro-magnetic wave reflections from acidic ice layers formed, it is assumed, by volcanic eruption-derived aerosols. These acidic layers represent isochronous surfaces within the ice sheet. We are able to trace five prominent layers for over 500 km across the Antarctic Ice Sheet, between Vostok and the new ice-core site at Dome C. This correlates the stratigraphy and depth-age relationship between the two sites. The thickness of ice deposited over the last glacial cycle (120,000 years) at Dome C is 300 m greater than at Vostok and, at comparable depths, the ice at Dome C is between about 10,000 and 25,000 years younger than at Vostok.

引用

页码：1019 / 1022

页数：4

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