globalchange  > 气候变化与战略
DOI: 10.5194/cp-9-173-2013
Scopus记录号: 2-s2.0-84873862548
论文题名:
Does Antarctic glaciation cool the world?
作者: Goldner A.; Huber M.; Caballero R.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期:1
起始页码: 173
结束页码: 189
语种: 英语
Scopus关键词: climate effect ; climate feedback ; climate prediction ; cooling ; Eocene ; Eocene-Oligocene boundary ; glaciation ; ice sheet ; paleoclimate ; proxy climate record ; radiative forcing ; sea ice ; temperature anomaly ; Antarctica
英文摘要: In this study, we compare the simulated climatic impact of adding an Antarctic ice sheet (AIS) to the "greenhouse world" of the Eocene and removing the AIS from the modern world. The modern global mean surface temperature anomaly (ΔT) induced by Antarctic Glaciation depends on the background CO2 levels and ranges from -1.22 to -0.18 K. The Eocene ΔT is nearly constant at ∼-0.25 K. We calculate an climate sensitivity parameter S[Antarctica] which we define as ΔT divided by the change in effective radiative forcing (ΔQAntarctica) which includes some fast feedbacks imposed by prescribing the glacial properties of Antarctica.

The main difference between the modern and Eocene responses is that a negative cloud feedback warms much of the Earth's surface as a large AIS is introduced in the Eocene, whereas this cloud feedback is weakly positive and acts in combination with positive sea-ice feedbacks to enhance cooling introduced by adding an ice sheet in the modern. Because of the importance of cloud feedbacks in determining the final temperature sensitivity of the AIS, our results are likely to be model dependent. Nevertheless, these model results suggest that the effective radiative forcing and feedbacks induced by the AIS did not significantly decrease global mean surface temperature across the Eocene-Oligocene transition (EOT -34.1 to 33.6 Ma) and that other factors like declining atmospheric CO2 are more important for cooling across the EOT. The results illustrate that the efficacy of AIS forcing in the Eocene is not necessarily close to one and is likely to be model and state dependent. This implies that using EOT paleoclimate proxy data by itself to estimate climate sensitivity for future climate prediction requires climate models and consequently these estimates will have large uncertainty, largely due to uncertainties in modelling low clouds. © Author(s) 2013.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49484
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Recommended Citation:
Goldner A.,Huber M.,Caballero R.. Does Antarctic glaciation cool the world?[J]. Climate of the Past,2013-01-01,9(1)
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