DOI: 10.1002/2015GL063322
论文题名: How obliquity cycles powered early Pleistocene global ice-volume variability
作者: Tabor C.R. ; Poulsen C.J. ; Pollard D.
刊名: Geophysical Research Letters
ISSN: 0094-8832
EISSN: 1944-8563
出版年: 2015
卷: 42, 期: 6 起始页码: 1871
结束页码: 1879
语种: 英语
英文关键词: ice sheet
; isotopes
; orbit
; Pleistocene
; sea ice
; vegetation
Scopus关键词: Climate models
; Glaciers
; Incident solar radiation
; Isotopes
; Orbits
; Sea ice
; Solar radiation
; Spectrum analysis
; Vegetation
; Early pleistocene
; Eccentricity modulation
; Global ice volume
; Ice sheet
; Ice sheet models
; Milankovitch theory
; Pleistocene
; Signal strengths
; Ice
; albedo
; ice cover
; ice sheet
; insolation
; obliquity
; orbital forcing
; summer
; Southern Ocean
英文摘要: Milankovitch theory proposes that the magnitude of high-latitude summer insolation dictates the continental ice-volume response by controlling summer snow melt, thus anticipating a substantial ice-volume contribution from the strong summer insolation signal of precession. Yet almost all of the early Pleistocene δ18O records' signal strength resides at the frequency of obliquity. Here we explore this discrepancy using a climate-vegetation-ice sheet model to simulate climate-ice sheet response to transient orbits of varying obliquity and precession. Spectral analysis of our results shows that despite contributing significantly less to the summer insolation signal, almost 60% of the ice-volume power exists at the frequency of obliquity due to a combination of albedo feedbacks, seasonal offsets, and orbital cycle duration differences. Including eccentricity modulation of the precession ice-volume component and assuming a small Antarctic ice response to orbital forcing produce a signal that agrees with the δ18O ice-volume proxy records. Key Points Climate responses to orbital changes simulated with an Earth system model Model produces a larger ice-volume response to obliquity than precession Model results agree with early Pleistocene oxygen isotope records ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927798251&doi=10.1002%2f2015GL063322&partnerID=40&md5=d1b3d327f5b2b46d885097bc3bb4fb8b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8448
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, United States
Recommended Citation:
Tabor C.R.,Poulsen C.J.,Pollard D.. How obliquity cycles powered early Pleistocene global ice-volume variability[J]. Geophysical Research Letters,2015-01-01,42(6).