Millennial-scale oscillations in the Southern Ocean in response to atmospheric CO2 increase

被引：13

作者：

Alvarez-Solas, Jorge ^{[1
]}

Charbit, Sylvie ^{[1
]}

Ramstein, Gilles ^{[1
]}

Paillard, Didier ^{[1
]}

Dumas, Christophe ^{[1
]}

Ritz, Catherine ^{[2
]}

Roche, Didier M. ^{[1
]}

机构：

[1] CEA Saclay, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France

[2] UJF Grenoble 1, CNRS, LGGE UMR 5183, Lab Glaciol & Geophys Environm, F-38041 Grenoble, France

来源：

GLOBAL AND PLANETARY CHANGE | 2011年 / 76卷 / 3-4期

关键词：

millennial oscillations; climate variability; abrupt change; global warming; ice sheets; ocean behaviour; Southern Ocean; ANTARCTIC ICE-SHEET; COUPLED CLIMATE; THERMOHALINE CIRCULATION; INTERMEDIATE COMPLEXITY; MULTIPLE EQUILIBRIA; RAPID TRANSITIONS; SYSTEM MODEL; NORTH; VARIABILITY; EVOLUTION;

D O I：

10.1016/j.gloplacha.2010.12.004

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

A coupled climate-ice-sheet model is used to investigate the response of climate at the millennial time scale under several global warming long-term scenarios, stabilized at different levels ranging from 2 to 7 times the pre-industrial CO2 level. The climate response is mainly analyzed in terms of changes in temperature, oceanic circulation, and ice-sheet behaviour. For the 4 x CO2 scenario, the climate response appears to be highly non-linear: abrupt transitions occur in the Southern Ocean deep water formation strength with a period of about 1200 yr. These millennial oscillations do not occur for both lower and larger CO2 levels. We show that these transitions are associated with internal oscillations of the Southern Ocean, triggered by the Antarctic freshwater budget. We first analyse the oscillatory mechanism. Secondly, through a series of 420 sensitivity experiments we also explore the range of temperature and freshwater flux for which such oscillations can be triggered. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：128 / 136

页数：9