DOI: 10.1016/j.quascirev.2016.01.024
Scopus记录号: 2-s2.0-84958168093
论文题名: Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP)
作者: Colleoni F. ; Wekerle C. ; Näslund J.-O. ; Brandefelt J. ; Masina S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 137 起始页码: 97
结束页码: 112
语种: 英语
英文关键词: Climate feedbacks
; Climate modeling
; Marine Isotope Stage 6
; Northern Hemisphere ice sheets
; Penultimate glaciation
Scopus关键词: Climate models
; Glacial geology
; Glaciers
; Sea ice
; Snow
; Topography
; Climate feedbacks
; Ice sheet
; Large-scale circulation
; Last Glacial Maximum
; Laurentide ice sheets
; Marine isotope stages
; Negative temperatures
; Penultimate glaciation
; Ice
; arctic environment
; Beringia
; climate modeling
; glaciation
; high temperature
; ice sheet
; Last Glacial Maximum
; marine isotope stage
; Northern Hemisphere
; planetary wave
; precipitation (climatology)
; regional climate
; snow cover
; storm track
; temperature anomaly
; topography
; Atlantic Ocean
; Atlantic Ocean (North)
; North America
; Siberia
英文摘要: The penultimate glacial maximum (PGM, ≈140 kyrs BP), is known to be the most extensive glaciation on record that occurred during the last 400 kyrs over Eurasia. We used a coupled Atmosphere-Ocean-Sea-Ice-Land model to simulate the climate of the PGM accounting for a reconstruction of the large PGM Eurasian ice sheet. Due to uncertainties in the PGM Laurentide ice-sheet topography, two simulations with different ice-sheet topographies over North America (large as for the Last Glacial Maximum, LGM and small as for 13 kyrs BP) are performed. Results show that the simulated PGM glacial maximum climates are of comparable magnitude with previous simulations of the LGM in both cases. Assuming a small Laurentide ice-sheet instead of the LGM one in our PGM simulations results in a shift in the planetary waves. This causes an increase in storm track activity over the North Atlantic as well as higher temperatures and precipitation rates over North America, North Atlantic and over the Eurasian ice sheet. In addition, it induces a negative temperature anomaly over East Siberia yielding a thick snow cover, which seems to be in agreement with data from recent Arctic campaigns suggesting that an ice cap developed over Beringia during the PGM. All together, the changes in large-scale circulation and regional climate simulated using a small Laurentide ice sheet match the proxies well. Based on our findings, we suggest that the Laurentide ice sheet might have been smaller during the PGM than during the LGM, in turn also implying a larger Eurasian ice sheet than during the LGM, which is supported by various geological evidence of the PGM. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59653
Appears in Collections: 过去全球变化的重建
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作者单位: Centro Euro-Mediterraneo sui Cambiamenti Climatici, Bologna, Italy; Alfred Wegener Institut, Bremerhaven, Germany; Swedish Nuclear Fuel and Waste Management Company, Stockholm, Sweden; Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Italy
Recommended Citation:
Colleoni F.,Wekerle C.,Näslund J.-O.,et al. Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP)[J]. Quaternary Science Reviews,2016-01-01,137