Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego

Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego
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火地岛东南部 Isla de los Estados(南纬 54°4°)的冰消环境变化

DOI:
10.1016/j.quascirev.2008.05.004
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发表时间:
2008
影响因子:
4
通讯作者:
Wohlfahrt
Wohlfahrt
中科院分区:
地球科学1区
文献类型:
--
作者:
Björck;Wohlfahrt

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埃斯塔多斯岛位于南纬54.5°,西经64°,阿根廷火地岛以东,处于南极洲和南美洲之间纬向环流的敏感地理位置。它对末次冰消期的陆地记录,记录了海洋环境中的大气条件,可以帮助澄清大气和海洋区域环流模式的变化。在这里,我们提出的地球化学分析,从16- 10千卡BP的泥炭芯从湖Galvarne沼泽在北方海岸的岛屿,和湖泊沉积物芯从拉古纳卡斯卡达3公里更远的南部。这些数据包括TC、TN、烧失量分析和对两个岩心的连续XRF扫描,以及基于AMS-14 C测年的年龄-深度建模。冰消作用和泥炭形成在沿海地区的发病开始前16 kacalBP,随后迅速的冰川退缩和湖相沉积开始进一步内陆。数据表明,最初有风的条件下,永久冻土成功地逐渐温暖和潮湿的条件,直到约14.5 kacalBP。变暖趋势减缓,直到约13.5 kacalBP,随后是干旱条件,达到约12.8 kacalBP。我们的数据表明,大约10.6 kacalBP时,条件相当温暖,并且形成了更密集的泥炭和森林植被,与南极热最佳状态的出现同时发生。这表明大规模的转变,在位置的纬向流和西风带在全新世开始。
The island of Isla de los Estados is situated at 54.5°S, 64°W, east of Argentinian Tierra del Fuego, and is located in a sensitive geographic position in relation to the zonal circulation between Antarctica and South America. Its terrestrial records of the last deglaciation, recording atmospheric conditions but within an oceanic setting, can help to clarify changes of regional circulation patterns, both atmospheric and marine. Here, we present geochemical analyses from 16–10kacalBP of a peat core from Lago Galvarne Bog at the northern coast of the island, and a lake sediment core from Laguna Cascada 3km further south. The data comprise TC, TN, loss on ignition analyses and continuous XRF scanning on both cores as well as age–depth modeling based on AMS-14C dating. Deglaciation and onset of peat formation in the coastal areas began before 16kacalBP followed by a rapid glacial retreat and the start of lacustrine sedimentation further inland. Data suggest initially windy conditions with permafrost succeeded by gradually warmer and wetter conditions until ca 14.5kacalBP. The warming trend slows down until ca 13.5kacalBP, followed by arid conditions culminating around 12.8kacalBP. Our data suggest fairly warm conditions and the establishment of denser peat and forest vegetation ca 10.6kacalBP, contemporaneous with the onset of the Antarctic thermal optimum. This indicates large-scale shifts in the placement of zonal flow and the Westerlies at the beginning of the Holocene.
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