DOI: 10.1016/j.quascirev.2018.07.039
Scopus记录号: 2-s2.0-85051043502
论文题名: Rapid Laurentide ice-sheet advance towards southern last glacial maximum limit during marine isotope stage 3
作者: Carlson A.E. ; Tarasov L. ; Pico T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 196 起始页码: 118
结束页码: 123
语种: 英语
Scopus关键词: Glacial geology
; Glaciers
; Isotopes
; Sea level
; Sediments
; Glacial Isostatic Adjustments
; Global ice volume
; Global mean sea levels
; Intermediate fields
; Lacustrine sediments
; Last Glacial Maximum
; Laurentide ice sheets
; Marine isotope stages
; Ice
; glacioisostasy
; lacustrine deposit
; Last Glacial Maximum
; Laurentide Ice Sheet
; marine isotope stage
; runoff
; sea level change
; Wisconsinan
; Atlantic Ocean
; Canada
; Gulf of Mexico
; Hudson Bay
; Iowa
; Michigan
; North America
; United States
英文摘要: Marine isotope stage (MIS) 3 (∼58–28 ka) is a period of intermediate global ice volume between MIS 4 and the last glacial maximum of MIS 2. Here we report geologic evidence for southern Laurentide ice-sheet rapid growth to near its last glacial maximum extent after a period with limited ice in the southernmost Hudson Bay lowland. A14C age on wood in lacustrine sediments interbedded with glacial tills in central-eastern Wisconsin dates a Laurentide ice-sheet advance southwards to an extent at least equivalent to at least its ∼17 ka deglacial limit by 39.1 ± 0.4 ka. This advance ended before 30.4 ± 0.9 ka based on another 14C date on wood in lacustrine sediment overlying the till layers. This advance is consistent with 14C ages from Michigan and Iowa, and Gulf of Mexico runoff records that support a concurrent southern Laurentide ice-sheet advance. We infer changes in North American ice volume using ice-sheet model simulations from a large ensemble that are consistent with 14C-data and Gulf of Mexico-discharge constraints. The simulations show the Laurentide ice sheet growing from a volume equivalent to 25–30 m of global mean sea level (GMSL) before ∼40 ka to 40–45 m of GMSL at ∼40 ka, and reaching 65–70 m GMSL by ∼30 ka, consistent with glacial isostatic adjustment assessments of near-to intermediate-field sea-level data. We thus show from our terrestrial field data and ice-sheet model simulations that an individual ice sheet can grow rapidly, which has only been inferred previously for global ice volume from GSML records. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112086
Appears in Collections: 气候减缓与适应
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作者单位: College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, United States; Department of Physics and Physical Oceanography, Memorial University, Canada; Department of Earth and Planetary Sciences, Harvard University, United States
Recommended Citation:
Carlson A.E.,Tarasov L.,Pico T.. Rapid Laurentide ice-sheet advance towards southern last glacial maximum limit during marine isotope stage 3[J]. Quaternary Science Reviews,2018-01-01,196