Modern foraminiferal assemblages in northern Nares Strait, Petermann Fjord, and beneath Petermann ice tongue, NW Greenland

Modern foraminiferal assemblages in northern Nares Strait, Petermann Fjord, and beneath Petermann ice tongue, NW Greenland
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内雷斯海峡北部、彼得曼峡湾和格陵兰西北部彼得曼冰舌下方的现代有孔虫组合

DOI:
10.1080/15230430.2020.1806986
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发表时间:
2020
期刊:
Arctic, Antarctic, and Alpine Research
影响因子:
--
通讯作者:
M. Cheseby
M. Cheseby
中科院分区:
--
文献类型:
--
作者:
A. Jennings;J. Andrews;B. Reilly;M. Walczak;M. Jakobsson;A. Mix;J. Stoner;K. Nicholls;M. Cheseby

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摘要2010年和2012年格陵兰岛西北部彼得曼冰川的崩解事件使其冰舌长度减少了约25公里,使其能够在2015年彼得曼探险期间勘探到新发现的海底。本文介绍了纳尔斯海峡北部和彼得曼峡湾13个表层沉积物样品的有孔虫分析结果和环境数据,其中包括现代冰舌下的样品。这是第一次对北极冰舌下活的有孔虫进行研究,也是该地区第一批现代有孔虫数据。对现代组合进行了研究,以约束物种环境偏好,并改进有孔虫组合的古环境解释。冰下舌的组合与所有其他地点的组合有很大的不同,动物丰度很低,以凝集的动物为主,这可能反映了冰舌下食物供应的低水平。峡湾动物群由80%或更多的钙质物种组成。值得注意的是,冰舌下没有棒状Elphdium,尽管它在峡湾占主导地位。与向流动海冰过渡相关的初级生产力的增加,彼得曼冰川融水的影响随着距离接地线的距离而减弱,以及纳尔斯海峡南流的影响增加,是对动物群组合的重要控制。
ABSTRACT Calving events of Petermann Glacier, northwest Greenland, in 2010 and 2012 reduced the length of its ice tongue by c. 25 km, allowing exploration of newly uncovered seafloor during the Petermann 2015 Expedition. This article presents the results of foraminiferal analysis and environmental data from thirteen surface sediment samples in northern Nares Strait and Petermann Fjord, including beneath the modern ice tongue. This is the first study of living foraminifera beneath an arctic ice tongue and the first modern foraminiferal data from this area. Modern assemblages were studied to constrain species environmental preferences and to improve paleoenvironmental interpretations of foraminiferal assemblages. Sub–ice tongue assemblages differed greatly from those at all other sites, with very low faunal abundances and being dominated by agglutinated fauna, likely reflecting low food supply under the ice tongue. Fjord fauna were comprised of 80 percent or more calcareous species. Notably, Elphidium clavatum is absent beneath the ice tongue although it is dominant in the fjord. Increasing primary productivity associated with the transition to mobile sea ice, diminishing influence of the Petermann Glacier meltwater with distance from the grounding line, and increased influence of south-flowing currents in Nares Strait are the important controls on the faunal assemblages.
夏季地表融化通过增强通道化基底融化而使彼得曼冰川冰架变薄
DOI: 10.1017/jog.2019.43
发表时间: 2019
影响因子: 3.4
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发表时间: 2016
期刊: Oceanography
影响因子: 2.8
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DOI: 10.2113/gsjfr.52.2.219
发表时间: 2020
影响因子: 1.1
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DOI: 10.1175/jpo-d-17-0181.1
发表时间: 2018
影响因子: 3.5
作者:
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