Uncertainties in the modelled CO2 threshold for Antarctic glaciation

被引：55

作者：

Gasson, E. ^{[1
,2
]}

Lunt, D. J. ^{[3
]}

DeConto, R. ^{[2
]}

Goldner, A. ^{[4
]}

Heinemann, M. ^{[5
]}

Huber, M. ^{[4
]}

LeGrande, A. N. ^{[6
]}

Pollard, D. ^{[7
]}

Sagoo, N. ^{[3
]}

Siddall, M. ^{[1
]}

Winguth, A. ^{[8
]}

Valdes, P. J. ^{[3
]}

机构：

[1] Univ Bristol, Dept Earth Sci, Bristol, Avon, England

[2] Univ Massachusetts, Climate Syst Res Ctr, Amherst, MA 01003 USA

[3] Univ Bristol, Sch Geog Sci, Bristol, Avon, England

[4] Purdue Univ, W Lafayette, IN 47907 USA

[5] Univ Hawaii, Int Pacific Res Ctr, Honolulu, HI 96822 USA

[6] NASA, Goddard Inst Space Studies, New York, NY 10025 USA

[7] Penn State Univ, Earth & Environm Syst Inst, State Coll, PA USA

[8] Univ Texas Arlington, Dept Earth & Environm Sci, Arlington, TX USA

来源：

CLIMATE OF THE PAST | 2014年 / 10卷 / 02期

基金：

美国国家科学基金会;

关键词：

GREENLAND ICE-SHEET; EOCENE THERMAL MAXIMUM; ATMOSPHERIC CO2; OCEAN CIRCULATION; SEA TEMPERATURES; CLIMATE RESPONSE; CARBON-DIOXIDE; SENSITIVITY; ONSET; WARM;

D O I：

10.5194/cp-10-451-2014

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A frequently cited atmospheric CO2 threshold for the onset of Antarctic glaciation of similar to 780 ppmv is based on the study of DeConto and Pollard (2003) using an ice sheet model and the GENESIS climate model. Proxy records suggest that atmospheric CO2 concentrations passed through this threshold across the Eocene-Oligocene transition similar to 34 Ma. However, atmospheric CO2 concentrations may have been close to this threshold earlier than this transition, which is used by some to suggest the possibility of Antarctic ice sheets during the Eocene. Here we investigate the climate model dependency of the threshold for Antarctic glaciation by performing offline ice sheet model simulations using the climate from 7 different climate models with Eocene boundary conditions (HadCM3L, CCSM3, CESM1.0, GENESIS, FAMOUS, ECHAM5 and GISS_ER). These climate simulations are sourced from a number of independent studies, and as such the boundary conditions, which are poorly constrained during the Eocene, are not identical between simulations. The results of this study suggest that the atmospheric CO2 threshold for Antarctic glaciation is highly dependent on the climate model used and the climate model configuration. A large discrepancy between the climate model and ice sheet model grids for some simulations leads to a strong sensitivity to the lapse rate parameter.

引用

页码：451 / 466

页数：16

共 75 条

[1]

ABE-OUCHI A, 1993, ANN GLACIOL-SER, V18, P203, DOI 10.1017/S0260305500011514

[2]

[Anonymous], 1984, J APPL MECH, DOI DOI 10.1115/1.3167761

[3] Onset of Cenozoic Antarctic glaciation [J].