An ice-core proxy for northerly air mass incursions into West Antarctica

被引：40

作者：

Dixon, Daniel A. ^{[1
,2
]}

Mayewski, Paul A. ^{[1
,2
]}

Goodwin, Ian D. ^{[3
]}

Marshall, Gareth J. ^{[4
]}

Freeman, Rhaelene ^{[3
]}

Maasch, Kirk A. ^{[1
,2
]}

Sneed, Sharon B. ^{[1
,2
]}

机构：

[1] Univ Maine, Climate Change Inst, Orono, ME 04469 USA

[2] Univ Maine, Dept Earth Sci, Orono, ME 04469 USA

[3] Macquarie Univ, Sydney, NSW 2109, Australia

[4] British Antarctic Survey, Cambridge CB3 0ET, England

来源：

INTERNATIONAL JOURNAL OF CLIMATOLOGY | 2012年 / 32卷 / 10期

基金：

美国国家科学基金会;

关键词：

Antarctic; glaciochemistry; Southern Hemisphere westerlies; climate change; International Trans Antarctic Scientific Expedition; atmospheric circulation; SOUTHERN-HEMISPHERE; CLIMATE VARIABILITY; SEA-ICE; EXTRATROPICAL CIRCULATION; EASTERN AUSTRALIA; ATMOSPHERIC CO2; TRACE-ELEMENT; ANNULAR MODES; POLAR ICE; DUST;

D O I：

10.1002/joc.2371

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

A 200-year proxy for northerly air mass incursions (NAMI) into central and western West Antarctica is developed from the examination of 19 shallow (21150 m deep) Antarctic ice-core non-sea-salt (nss) Ca2+ concentration records. The NAMI proxy reveals a significant rise in recent decades. This rise is unprecedented for at least the past 200 years and is coincident with anthropogenically driven changes in other large-scale Southern Hemisphere (SH) environmental phenomena such as greenhouse gas (GHG) induced warming, ozone depletion, and the associated intensification of the SH westerlies. The Hysplit trajectory model is used to examine air mass transport pathways into West Antarctica. Empirical orthogonal function analysis, in combination with trajectory results, suggests that atmospheric circulation is the dominant factor affecting nssCa2+ concentrations throughout central and western West Antarctica. Ozone recovery will likely weaken the spring-summer SH westerlies in the future. Consequently, Antarctica could lose one of its best defences against SH GHG warming. Copyright (c) 2011 Royal Meteorological Society

引用

页码：1455 / 1465

页数：11

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