Testing models of ice cap extent, South Georgia, sub-Antarctic

Testing models of ice cap extent, South Georgia, sub-Antarctic
复制标题

南乔治亚岛、亚南极洲冰盖范围测试模型

DOI:
10.1016/j.quascirev.2016.11.007
复制
发表时间:
2016
影响因子:
4
通讯作者:
Zander
Zander
中科院分区:
地球科学1区
文献类型:
--
作者:
Barlow;Bentley;Hansom;Brader;Zander

文献摘要

参考文献

被引文献

相似文献

南乔治亚岛末次盛冰期冰的范围存在争议,有两种替代假设:冰到达大陆架边缘的广泛(最大)模型,或冰局限于内峡湾的有限(最小)模型。我们提出了南乔治亚岛新的相对海平面数据集,总结了该岛海洋界限和前海平面海拔的已发表和新的地貌证据。使用特别适合区域建模并在高空间分辨率下工作的冰川均衡调整模型(ALMA),结合一系列模拟的冰荷载历史,我们使用相对海平面数据来测试有限和广泛的冰范围情景。模型结果表明,南乔治亚岛很可能发生过一次广泛的末次盛冰期冰川作用,这意味着该岛被厚厚的(>1000米)冰覆盖,可能到达大陆架边缘,冰川消退发生得相对较早(大约距今15年,尽管独立数据表明这可能早在距今18年)。延伸到陆架边缘的广泛冰盖的存在意味着,如果南乔治亚岛周围有任何生物保护区,它们一定是相对局部化的,并且仅限于最外层的陆架。
The extent of Last Glacial Maximum ice in South Georgia is contested, with two alternative hypotheses: an extensive (maximum) model of ice reaching the edge of the continental shelf, or a restricted (minimum) model with ice constrained within the inner fjords. We present a new relative sea-level dataset for South Georgia, summarising published and new geomorphological evidence for the marine limit and elevations of former sea levels on the island. Using a glacial isostatic adjustment model (ALMA) specifically suited to regional modelling and working at high spatial resolutions, combined with a series of simulated ice-load histories, we use the relative sea-level data to test between the restricted and extensive ice extent scenarios. The model results suggest that there was most likely an extensive Last Glacial Maximum glaciation of South Georgia, implying that the island was covered by thick (>1000 m) ice, probably to the edge of the continental shelf, with deglaciation occurring relatively early (ca. 15 ka BP, though independent data suggest this may have been as early as 18 ka). The presence of an extensive ice cap extending to the shelf edge would imply that if there were any biological refugia around South Georgia, they must have been relatively localised and restricted to the outermost shelf.
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
P. Stocchi;G. Spada
通讯作者: G. Spada
重新思考斯瓦尔巴群岛西北部沿海的晚威克塞尔期冰盖动力学
DOI: 10.1111/j.1502-3885.2005.tb01001.x
发表时间: 2005
期刊: Boreas
影响因子: 2.2
作者:
J. Landvik;Ó. Ingólfsson;J. Mienert;S. Lehman;A. Solheim;Anders Elverhøi;D. Ottesen
通讯作者: D. Ottesen
DOI: 10.2458/azu_js_rc.55.16783
发表时间: 2013-01-01
期刊: RADIOCARBON
影响因子: 8.3
作者:
Hogg, Alan G.;Hua, Quan;Zimmerman, Susan R. H.
通讯作者: Zimmerman, Susan R. H.
斯匹次卑尔根岛圣琼斯峡湾晚魏希瑟尔冰消期和海平面历史:对冰盖重建的贡献
DOI: --
发表时间: 2005
期刊:
影响因子: --
作者:
D. Evans;B. Rea
通讯作者: B. Rea
亚南极岛屿南乔治亚岛的海滩形态和过程变化
DOI: --
发表时间: 1979
期刊:
影响因子: --
作者:
J. Hansom
通讯作者: J. Hansom