DOI: 10.1016/j.epsl.2018.05.004
Scopus记录号: 2-s2.0-85047060293
论文题名: Local insolation changes enhance Antarctic interglacials: Insights from an 800,000-year ice sheet simulation with transient climate forcing
作者: Tigchelaar M. ; Timmermann A. ; Pollard D. ; Friedrich T. ; Heinemann M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 495 起始页码: 69
结束页码: 78
语种: 英语
英文关键词: Antarctica
; glacial cycles
; ice sheet
; precession
; Quaternary
; sea level
Scopus关键词: Carbon dioxide
; Climate change
; Climate models
; Glacial geology
; Glaciers
; Greenhouse gases
; Incident solar radiation
; Sea level
; Antarctica
; Glacial cycles
; Ice sheet
; precession
; Quaternary
; Ice
; climate forcing
; computer simulation
; glacial-interglacial cycle
; ice sheet
; insolation
; precession
; Quaternary
; sea level change
; Antarctica
英文摘要: The Antarctic ice sheet – storing ∼27 million cubic kilometres of ice – has the potential to contribute greatly to future sea level rise; yet its past evolution and sensitivity to long-term climatic drivers remain poorly understood and constrained. In particular, a long-standing debate questions whether Antarctic climate and ice volume respond mostly to changes in global sea level and atmospheric greenhouse gas concentrations or to local insolation changes. So far, long-term Antarctic simulations have used proxy-based parameterizations of climatic drivers, presuming that external forcings are synchronous and spatially uniform. Here for the first time we use a transient, three-dimensional climate simulation over the last eight glacial cycles to drive an Antarctic ice sheet model. We show that the evolution of the Antarctic ice sheet was mostly driven by CO2 and sea level forcing with a period of about 100,000 yr, synchronizing both hemispheres. However, on precessional time scales, local insolation forcing drives additional mass loss during periods of high sea level and CO2, enhancing the Antarctic interglacial and putting northern and southern ice sheet variability temporarily out of phase. In our simulations, partial collapses of the West Antarctic ice sheet during warm interglacials are only simulated with unrealistically large Southern Ocean subsurface warming exceeding ∼4 °C. Overall, our results further elucidate the complex interplay of global and local forcings in driving Late Quaternary Antarctic ice sheet evolution, and the unique and overlooked role of precession therein. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109829
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Center for Climate Physics, Institute for Basic Science, Busan, South Korea; Pusan National University, Busan, South Korea; International Pacific Research Center, University of Hawai'i at Mānoa, Honolulu, HI, United States; Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, United States; Institute of Geosciences, Kiel University, Kiel, Germany
Recommended Citation:
Tigchelaar M.,Timmermann A.,Pollard D.,et al. Local insolation changes enhance Antarctic interglacials: Insights from an 800,000-year ice sheet simulation with transient climate forcing[J]. Earth and Planetary Science Letters,2018-01-01,495