Phased Patagonian Ice Sheet response to Southern Hemisphere atmospheric and oceanic warming between 18 and 17 ka

被引：16

作者：

Bendle, Jacob M. ^{[1
]}

Palmer, Adrian P. ^{[1
]}

Thorndycraft, Varyl R. ^{[1
]}

Matthews, Ian P. ^{[1
]}

机构：

[1] Royal Holloway Univ London, Dept Geog, Quaternary Res Ctr, Egham TW20 0EX, Surrey, England

来源：

SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期

基金：

英国自然环境研究理事会;

关键词：

LAST GLACIAL MAXIMUM; LAGO BUENOS-AIRES; CLIMATE-CHANGE; OVERTURNING CIRCULATION; VARVE CHRONOLOGY; BIPOLAR SEESAW; RECORD; LAKE; GREENLAND; DRIVEN;

D O I：

10.1038/s41598-019-39750-w

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The onset of deglaciation in the Southern Hemisphere mid-latitudes has been attributed to the southward transmission of climate anomalies in response to slow-down of Atlantic meridional overturning circulation (AMOC) during Heinrich Stadial 1 (HS-1; 18-14.6 ka). However, inferences on the response of former ice sheets to sub-millennial palaeoclimate shifts are limited by a shortage of high-resolution terrestrial archives. Here we use a similar to 1000-year duration, annually-resolved lake sediment record to investigate the deglacial retreat dynamics of the Lago General Carrera-Buenos Aires ice lobe (46.5 degrees S) of the former Patagonian Ice Sheet. We attribute the onset of glacier retreat at 18.0 +/- 0.14 cal ka BP to abrupt southward migration of the Southern Westerly Winds that enhanced solar radiation receipt (and ablation) at the ice sheet surface. We infer that accelerated retreat from 17.77 +/- 0.13 cal ka BP represents a lagged Southern Hemisphere response to gradual ocean-atmosphere warming associated with the centennial-scale transmission of Northern Hemisphere climate anomalies through the oceanic bipolar seesaw. By 17.38 +/- 0.12 cal ka BP, the glacier margin had receded into a deepening proglacial lake, instigating sustained calving losses and more rapid ice recession.

引用

页数：9

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