Late Holocene ice-mass changes recorded in a relative sea-level record from Joinville Island, Antarctica

Late Holocene ice-mass changes recorded in a relative sea-level record from Joinville Island, Antarctica
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南极洲茹恩维尔岛相对海平面记录中记录的全新世晚期冰块变化

DOI:
10.1130/g46649.1
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发表时间:
2019
期刊:
影响因子:
5.8
通讯作者:
Simms, Alexander R.
Simms, Alexander R.
中科院分区:
地球科学1区
文献类型:
--
作者:
Zurbuchen, Julie;Simms, Alexander R.

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最近,由于沿着南极半岛变暖而导致的冰量损失导致了整个地区抬升速率的快速变化。这些事件仅仅是最近变暖的结果吗?如果不是,地球对这些事件的反应是否持续足够长的时间,以保存在全新世的相对海平面(RSL)记录中,从而对全球尺度的冰川均衡调整(GIA)模型(如ICE-6 G)产生影响?在南极洲解决这些问题受到该地区RSL重建稀缺的阻碍。本文以南极半岛Joinville岛的海滩洋脊为基础,提出了一种新的南极RSL重建方法。我们发现,在过去的3100年里,RSL下降了4.9±0.58米,并且该岛经历了RSL下降速率的显着增加,从1540±125 cal。(校准)yr BP至1320±125 cal. yr BP RSL下降速率的增加可能是由于固体地球对南极半岛陆地冰质量损失的粘弹性响应,类似于2002年CE在崩塌的拉森B冰架后面的冰川加速后冰质量损失后经历的地球响应。从695±190 cal. yr BP到235±175 cal. yr BP,海滩-山脊侵蚀速率较慢,可能反映了当地冰川推进引起的RSL上升对海滩山脊的侵蚀。地球对RSL记录中记录的微小冰量变化的快速反应进一步支持了最近的断言,即地球对冰川卸载的反应更灵敏,并且在与全新世和更新世海平面GIA相关的时间尺度上。因此,目前的大陆和全球GIA模型可能无法准确地捕捉到南极冰盖在十年和百年时间尺度上的冰量变化。
Recent ice-mass loss driven by warming along the Antarctic Peninsula has resulted in rapid changes in uplift rates across the region. Are such events only a function of recent warming? If not, does the Earth response to such events last long enough to be preserved in Holocene records of relative sea level (RSL), and thus have a bearing on global-scale glacial isostatic adjustment (GIA) models (eg ICE-6G)? Answering such questions in Antarctica is hindered by the scarcity of RSL reconstructions within the region. Here, a new RSL reconstruction for Antarctica is presented based on beach ridges from Joinville Island on the Antarctic Peninsula. We find that RSL has fallen 4.9±0.58 m over the past 3100 yr, and that the island experienced a significant increase in the rate of RSL fall from 1540±125 cal.(calibrated) yr BP to 1320±125 cal. yr BP This increase in the rate of RSL fall is likely due to the viscoelastic response of the solid Earth to terrestrial ice-mass loss from the Antarctic Peninsula, similar to the Earth response experienced after ice-mass loss following acceleration of glaciers behind the collapsed Larsen B ice shelf in 2002 CE Additionally, slower rates of beach-ridge progradation from 695±190 cal. yr BP to 235±175 cal. yr BP potentially reflect erosion of beach ridges from a RSL rise induced by a local glacial advance. The rapid response of the Earth to minor ice-mass changes recorded in the RSL record further supports recent assertions of a more responsive Earth to glacial unloading and at time scales relevant for GIA of Holocene and Pleistocene sea levels. Thus, current continental and global GIA models may not accurately capture the ice-mass changes of the Antarctic ice sheets at decadal and centennial time scales.
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