DOI: 10.1038/ngeo1703
论文题名: Glacial discharge along the west Antarctic Peninsula during the Holocene
作者: Pike J. ; Swann G.E.A. ; Leng M.J. ; Snelling A.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 3 起始页码: 199
结束页码: 202
语种: 英语
Scopus关键词: atmospheric forcing
; continental margin
; continental shelf
; diatom
; El Nino-Southern Oscillation
; glacial environment
; global warming
; Holocene
; ice sheet
; isotopic composition
; La Nina
; marine environment
; oxygen isotope
; reconstruction
; sea surface temperature
; temperature effect
; upwelling
; Antarctic Peninsula
; Antarctica
; West Antarctica
; Bacillariophyta
; Nitzschia alba
英文摘要: The causes for rising temperatures along the Antarctic Peninsula during the late Holocene have been debated, particularly in light of instrumental records of warming over the past decades1. Suggested mechanisms range from upwelling of warm deep waters onto the continental shelf in response to variations in the westerly winds2, to an influence of El Niño-Southern Oscillation on sea surface temperatures3. Here, we present a record of Holocene glacial ice discharge, derived from the oxygen isotope composition of marine diatoms from Palmer Deep along the west Antarctic Peninsula continental margin. We assess atmospheric versus oceanic influences on glacial discharge at this location, using analyses of diatom geochemistry to reconstruct atmospherically forced glacial ice discharge and diatom assemblage4 ecology to investigate the oceanic environment. We show that two processes of atmospheric forcing - an increasing occurrence of La Niña events5 and rising levels of summer insolation - had a stronger influence during the late Holocene than oceanic processes driven by southern westerly winds and upwelling of upper Circumpolar Deepwater. Given that the evolution of El Niño-Southern Oscillation under global warming is uncertain6, its future impacts on the climatically sensitive system of the Antarctic Peninsula Ice Sheet remain to be established. Copyright © 2013 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106832
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom; School of Geography, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom; Department of Geology, University of Leicester, Leicester LE1 7RH, United Kingdom; NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, United Kingdom
Recommended Citation:
Pike J.,Swann G.E.A.,Leng M.J.,et al. Glacial discharge along the west Antarctic Peninsula during the Holocene[J]. Nature Geoscience,2013-01-01,6(3)