| DOI: | 10.1016/j.quascirev.2017.04.010
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| Scopus记录号: | 2-s2.0-85017519751
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| 论文题名: | Modest global-scale cooling despite extensive early Pleistocene ice sheets |
| 作者: | Shakun J.D.
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| 刊名: | Quaternary Science Reviews
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| ISSN: | 2773791
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| 出版年: | 2017
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| 卷: | 165 | | 起始页码: | 25
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| 结束页码: | 30
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| 语种: | 英语
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| 英文关键词: | Climate sensitivity
; Glacial cycles
; Radiative forcing
; Sea surface temperatures
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| Scopus关键词: | Atmospheric radiation
; Atmospheric temperature
; Carbon dioxide
; Glacial geology
; Glaciers
; Greenhouse gases
; Oceanography
; Submarine geophysics
; Surface properties
; Surface waters
; Climate sensitivity
; Continental ice sheet
; Glacial cycles
; Last Glacial Maximum
; Marine isotope stages
; Radiative forcings
; Radiative perturbation
; Sea surface temperature (SST)
; Ice
; glacial-interglacial cycle
; greenhouse gas
; ice sheet
; Last Glacial Maximum
; marine isotope stage
; Pleistocene
; radiative forcing
; sea surface temperature
; sensitivity analysis
; spatial distribution
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| 英文摘要: | Expanded continental ice sheets and lowered greenhouse gases were the major radiative perturbations at the Last Glacial Maximum (LGM), and while they had similar magnitudes when averaged over the globe, their spatial distributions were dramatically different. It is consequently unclear how much each contributed to cooling around the world, and the overall global mean cooling in turn. Part of the difficulty in separating their effects is that ice sheets and greenhouse gases closely covaried over the late Pleistocene. The situation may have been different during the early Pleistocene though. Then, the ice sheets seem to have, at least on occasion, reached extents comparable to the LGM, but CO2 levels were relatively high, similar to those of late Pleistocene interglacials. A global compilation of 11 sea surface temperature records shows substantially less cooling in most regions during the Marine Isotope Stage 100 and 98 glacials at ∼2.5 Ma than during the LGM, suggesting that the thermal reach of the ice sheets was relatively limited and perhaps consistent with a more important role for greenhouse gases in driving temperatures around much of the world. © 2017 Elsevier Ltd |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/59234
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA, United States
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| Recommended Citation: | |
Shakun J.D.. Modest global-scale cooling despite extensive early Pleistocene ice sheets[J]. Quaternary Science Reviews,2017-01-01,165
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