Relative Sea-Level Changes and Ice Sheet History in Finderup Land, North Greenland
Relative Sea-Level Changes and Ice Sheet History in Finderup Land, North Greenland
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北格陵兰 Finderup 地的相对海平面变化和冰盖历史
DOI：
10.3389/feart.2018.00129
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发表时间：
2018
影响因子：
2.9
通讯作者：
T. Lauridsen
中科院分区：
文献类型：
--
作者：
A. Strunk;N. K. Larsen;A. Nilsson;M. Seidenkrantz;L. Levy;J. Olsen;T. Lauridsen
冰盖融化导致的全球海平面上升对持续变暖的气候构成了重大挑战。格陵兰冰盖（GrIS）是主要的贡献者之一，为了准确预测未来的冰退缩和海平面上升，必须了解冰盖在过去是如何对全球变暖做出反应的。相对海平面（RSL）的重建是过去冰盖波动模型的一个关键制约因素，然而，迄今为止，北格陵兰岛的高精度数据很少。在这项研究中，我们基于位于19.6和81.2 m a.s.l之间的五个隔离湖，对北格陵兰岛Finderup Land进行了RSL重建。利用XRF、岩性解释和有孔虫分析，确定了海洋和湖泊沉积物之间的过渡。年龄限制基于有孔虫14C定年和古地磁年龄对比。结果表明：Finderup Land在10.8±0.2 cal ka BP处于无冰状态，随后RSL从9.5±0.2 cal ka BP快速下降至8.0 cal ka BP，此时RSL开始接近现在的水平。此外，我们确定海洋极限最小值为81.2 m a.s.l.。我们将我们的数据与该地区模拟的RSL预测结果进行了比较，结果表明RSL下降更快，这反过来反映了冰退缩比估计的要快，并且可能是格陵兰北部和东北部的冰盖比以前估计的要大。(少)
Rising global sea level caused by melting ice sheets poses a major challenge in a persistently warming climate. The Greenland Ice Sheet (GrIS) is among the main contributors, and in order to make accurate predictions of future ice retreat and sea level rise, it is imperative to understand how the ice sheet responded to global warming in the past. Reconstructions of relative sea level (RSL) are a key constraint in models of past ice sheet fluctuations, however, high-precision data has until now been sparse in North Greenland. In this study, we present a RSL reconstruction for Finderup Land, North Greenland based on five isolation lakes located between 19.6 and 81.2 m a.s.l. The transition between marine and lacustrine sediments has been identified using XRF, lithological interpretation, and foraminiferal analysis. Age constraints are based on 14C dating of foraminifera and paleomagnetic age correlation. Our results show that Finderup Land was ice free by 10.8 ± 0.2 cal ka BP with a subsequent rapid RSL fall occurring from 9.5 ± 0.2 to 8.0 cal ka BP, at which point the RSL started to approach present level. Furthermore, we establish the marine limit to be minimum at 81.2 m a.s.l. We compare our data to modeled RSL predictions for the area and our results indicate a faster RSL fall, which in turn reflects that the ice retreat was more rapid than estimated and possibly, that the ice sheet in North and Northeast Greenland was larger than previous estimates suggest. (Less)
影响因子：
5.3
作者：
Constable, Catherine;Korte, Monika;Panovska, Sanja
通讯作者：
Panovska, Sanja
影响因子：
4
作者：
A. Long;S. Woodroffe;D. Roberts;S. Dawson
通讯作者：
A. Long;S. Woodroffe;D. Roberts;S. Dawson
影响因子：
2.8
作者：
A. Nilsson;R. Holme;M. Korte;N. Suttie;M. Hill
通讯作者：
A. Nilsson;R. Holme;M. Korte;N. Suttie;M. Hill