Near-field sea-level variability in northwest Europe and ice sheet stability during the last interglacial
Near-field sea-level variability in northwest Europe and ice sheet stability during the last interglacial
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欧洲西北部近场海平面变化和末次间冰期冰盖稳定性
DOI：
10.1016/j.quascirev.2015.08.021
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发表时间：
2015
影响因子：
4
通讯作者：
Long A
中科院分区：
文献类型：
--
作者：
Long A
全球海平面在末次间冰期（LIG，海洋同位素子阶段5e）达到顶峰之间c。5.5高出现在9米，意味着格陵兰和南极洲的大量融化。相对海平面（RSL）从几个远场和中场网站的观测表明，突然波动或跳跃的RSL在LIG高位，需要一个或多个事件的冰盖崩溃和再生。这些事件应表现为独特的海平面指纹，根据所涉冰量变化的来源，在远场、中场和近场地点进行记录。然而，迄今为止，在欧洲西北部的近场RSL研究中还没有报道这种波动的相关证据。这是一个重要的问题，因为LIG期间的RSL波动被描绘成极地冰盖在未来比现在更温暖的世界中可能表现的警告信号。在这里，我们审查的证据RSL变化在LIG使用地层数据，从最好的解决高水位记录存在于近场的西北欧，从一系列的设置，包括泻湖，浅海，潮坪，盐沼和咸水河流环境。考虑到先前公布的地层记录，从两个网站的Eemian海岸，海洋海湾，存在于荷兰中部，产生没有明确的迹象表明，突然RSL的变化，在实现近场高位。在北海、波罗的海和白色海沿岸国家的其他记录中，我们也没有发现任何共同的迹象。两个模拟实验，探索全球信号的假设海平面振荡所造成的部分崩溃和再生的格陵兰岛或南极LIG冰盖，表明北海地区是相对不敏感的质量变化来源于格陵兰岛，但应明确登记事件与南极起源，特别是那些发生在LIG晚。在这个时候，西北欧缺乏海平面突然波动的证据，同时也缺乏冰盖崩塌的清晰近场证据。
Global sea level during the Last Interglacial (LIG, Marine Isotope Sub-stage 5e) peaked between c. 5.5 and 9 m above present, implying significant melt from Greenland and Antarctica. Relative sea level (RSL) observations from several far- and intermediate-field sites suggest abrupt fluctuations or jumps in RSL during the LIG highstand that require one or more episodes of ice-sheet collapse and regrowth. Such events should be manifest as unique sea-level fingerprints, recorded in far-, intermediate- and near-field sites depending on the source(s) of ice-mass change involved. To date, though, no coherent evidence of such fluctuations has been reported from near-field RSL studies in northwest Europe. This is an important problem because RSL fluctuations during the LIG are portrayed as warning signs for how polar ice sheets may behave in a future, warmer than present, world. Here we review the evidence for RSL change during the LIG using stratigraphic data from the best resolved highstand records that exist in the near-field of northwest Europe, from a range of settings that include lagoonal, shallow marine, tidal flat, salt marsh and brackish-water fluviatile environments. Consideration of previously published stratigraphic records from two sites in the Eemian coastal-marine embayment that existed in the central Netherlands, yields no clear indications for abrupt RSL change during the attainment of the near-field highstand. Nor do we find any such indications common to other records from countries bordering the North Sea, the Baltic Sea and the White Sea. Two modelling experiments that explore the global signal of hypothetical sea-level oscillations caused by partial collapse and regrowth of either the Greenland or Antarctic LIG ice-sheet, show that the North Sea region is relatively insensitive to mass changes sourced from Greenland but should clearly register events with an Antarctic origin, especially those that occur late in the LIG. The lack of evidence for abrupt sea-level fluctuations at this time in northwest Europe concurs with a lack of clear near-field evidence for ice sheet collapse.
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DOI：
--
发表时间：
2006
期刊：
影响因子：
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作者：
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DOI：
--
发表时间：
2013
期刊：
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DOI：
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发表时间：
2004
期刊：
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