DOI: 10.1016/j.gloplacha.2013.09.012
论文题名: Interactions between carbon dioxide, climate, weathering, and the Antarctic ice sheet in the earliest Oligocene
作者: Pollard D. ; Kump L.R. ; Zachos J.C.
刊名: Global and Planetary Change
ISSN: 0921-8195
出版年: 2013
卷: 111 起始页码: 258
结束页码: 267
语种: 英语
英文关键词: Antarctic ice sheet
; Carbon cycles
; Eocene-Oligocene Transition
; Paleoclimate modeling
; Silicate weathering feedback
Scopus关键词: Antarctic ice sheets
; Carbon cycles
; Eocene-Oligocene Transition
; Paleoclimates
; Silicate weathering
; Carbon dioxide
; Glaciers
; Three dimensional
; Weathering
; Climate models
; carbon dioxide
; climate change
; climate oscillation
; environmental response
; ice sheet
; mass balance
; Oligocene
; parameterization
; silicate
; simulation
; weathering
; Southern Ocean
英文摘要: A coupled set of models is used to explore the possibility of long-term internal cycles in the CO2-climate-weathering-Antarctic Ice Sheet system. Cycles of this type were found in an earlier study with 0-D box models, and proposed to explain the quasi-periodic oscillations in benthic deep-sea-core records during the Eocene-Oligocene Transition ~34Ma. Here the system is extended using a 3-D Global Climate Model, a 3-D Antarctic ice-sheet model, and two previously published spatially distributed parameterizations of CO2 consumption by silicate weathering. In 6-million year long simulations across an idealized Eocene-Oligocene Transition, no internal cycles are found, and the coupled system just relaxes from the initial state to the final state, with at most one overdamped half-cycle. The absence of cycles is presumably due to features in this 3-D model system that are absent in the 0-D models: powerful Height Mass-Balance Feedback producing strong ice-sheet expansion after initial growth, and hysteresis in ice-sheet response to climate that damps retreat due to moderate warming.With one of the weathering parameterizations, the models indicate a region of negative slope in the relation between CO2 level and global weathering consumption, occurring in the range ~0.2 to 1.5x PAL (preindustrial atmospheric level). This contrasts with the monotonically increasing relation usually assumed. If confirmed, it would have serious consequences for the well-known CO2-weathering thermostat mechanism, at least for CO2 levels below ~1.5x PAL. © 2013 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84886236752&doi=10.1016%2fj.gloplacha.2013.09.012&partnerID=40&md5=04ad3e41794eb43f01f9a3c202b9c729
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11101
Appears in Collections: 全球变化的国际研究计划
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作者单位: Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, United States
Recommended Citation:
Pollard D.,Kump L.R.,Zachos J.C.. Interactions between carbon dioxide, climate, weathering, and the Antarctic ice sheet in the earliest Oligocene[J]. Global and Planetary Change,2013-01-01,111.