| DOI: | 10.5194/cp-10-451-2014
|
| Scopus记录号: | 2-s2.0-84896124524
|
| 论文题名: | Uncertainties in the modelled CO2 threshold for Antarctic glaciation |
| 作者: | Gasson E.; Lunt D.J.; Deconto R.; Goldner A.; Heinemann M.; Huber M.; Legrande A.N.; Pollard D.; Sagoo N.; Siddall M.; Winguth A.; Valdes P.J.
|
| 刊名: | Climate of the Past
|
| ISSN: | 18149324
|
| 出版年: | 2014
|
| 卷: | 10, 期:2 | | 起始页码: | 451
|
| 结束页码: | 466
|
| 语种: | 英语
|
| Scopus关键词: | carbon dioxide
; climate modeling
; Eocene-Oligocene boundary
; glaciation
; ice sheet
; numerical model
; paleoatmosphere
; paleoclimate
; proxy climate record
; uncertainty analysis
; Antarctica
|
| 英文摘要: | A frequently cited atmospheric CO2 threshold for the onset of Antarctic glaciation of ∼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 ∼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. © 2014 Author(s). |
| 资助项目: | NERC, Natural Environment Research Council
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/49302
|
| Appears in Collections: | 气候变化与战略
|
|
There are no files associated with this item.
|
| Recommended Citation: | |
Gasson E.,Lunt D.J.,Deconto R.,et al. Uncertainties in the modelled CO2 threshold for Antarctic glaciation[J]. Climate of the Past,2014-01-01,10(2)
|
|
|