Glacial discharge along the west Antarctic Peninsula during the Holocene

Glacial discharge along the west Antarctic Peninsula during the Holocene
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全新世期间南极半岛西部沿线的冰川放电

DOI:
10.1038/ngeo1703
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发表时间:
2013
期刊:
影响因子:
18.3
通讯作者:
Pike J
Pike J
中科院分区:
地球科学1区
文献类型:
--
作者:
Pike J

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全新世晚期南极半岛沿着气温上升的原因一直存在争议,特别是根据过去几十年的仪器记录。所提出的机制包括温暖的深层沃茨因西风变化而涌上大陆架,以及厄尔尼诺-南方涛动对海面温度的影响。在这里,我们提出了一个记录的全新世冰川冰排放,来自海洋硅藻的氧同位素组成帕尔默深沿着西南极半岛大陆边缘。我们评估了大气与海洋对该地点冰川排泄的影响,利用硅藻地球化学分析来重建大气强迫冰川排泄和硅藻群落生态学来调查海洋环境。我们发现,大气强迫的两个过程-拉尼娜事件的发生率增加和夏季日照水平的上升-有一个更强的影响,在晚全新世比海洋过程驱动的南部西风和上绕极深水涌。鉴于厄尔尼诺-南方涛动在全球变暖下的演变是不确定的,其对南极半岛冰盖气候敏感系统的未来影响仍有待确定。
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 decades. Suggested mechanisms range from upwelling of warm deep waters onto the continental shelf in response to variations in the westerly winds, to an influence of El Niño–Southern Oscillation on sea surface temperatures. 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 assemblage ecology to investigate the oceanic environment. We show that two processes of atmospheric forcing—an increasing occurrence of La Niña events 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 uncertain, its future impacts on the climatically sensitive system of the Antarctic Peninsula Ice Sheet remain to be established.
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DOI: --
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期刊:
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发表时间: 2002
期刊:
影响因子: --
作者:
F. Taylor;C. Sjunneskog
通讯作者: C. Sjunneskog
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发表时间: 2002
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J. Taylor;M. Tranter;G. Munhoven
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发表时间: 2008
期刊:
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