Scholarlink

<p>The Antarctic landscape is one of the most stable environments on the Earth, at least since approximately 14 million years ago when most glaciers in continental Antarctica changed from temperate to cold-based, and previous extensive fluvial activity disappeared. Here, we detected a large landscape change on a coastal glacier in continental Antarctica (Boulder Clay Glacier) that occurred in the Medieval Warm Period. Such change consists in a glacial unconformity marked by a continuous sediment layer and an erosion channel on the past glacier surface. This channel, more than 4 kilometers long, represents a local deepening of a glacial unconformity that cuts the underlying glacial strata and was clearly imaged and mapped by Ground Penetrating Radar data. Four boreholes were allowed to calibrate the sediment layer so identified because it was observed in all boreholes at depths between 1.85 and 3.07 m. Moreover, the occurrence at a depth of 11.11 meters of mosses suitable for the dating through radiocarbon dating provided the age of 1050 calibrated years before the present, implying that the erosion event occurred during the Medieval Warm Period between 900 and 989 before the present.</p><p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A warming pulse in the Antarctic continent changed the landscape during the Middle Ages

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月11日

查看全文
  • Emanuele Forte,
  • Maurizio Azzaro,
  • Nicoletta Cannone,
  • Alessandro Longhi,
  • Ilaria Santin,
  • Mauro Guglielmin

摘要

The Antarctic landscape is one of the most stable environments on the Earth, at least since approximately 14 million years ago when most glaciers in continental Antarctica changed from temperate to cold-based, and previous extensive fluvial activity disappeared. Here, we detected a large landscape change on a coastal glacier in continental Antarctica (Boulder Clay Glacier) that occurred in the Medieval Warm Period. Such change consists in a glacial unconformity marked by a continuous sediment layer and an erosion channel on the past glacier surface. This channel, more than 4 kilometers long, represents a local deepening of a glacial unconformity that cuts the underlying glacial strata and was clearly imaged and mapped by Ground Penetrating Radar data. Four boreholes were allowed to calibrate the sediment layer so identified because it was observed in all boreholes at depths between 1.85 and 3.07 m. Moreover, the occurrence at a depth of 11.11 meters of mosses suitable for the dating through radiocarbon dating provided the age of 1050 calibrated years before the present, implying that the erosion event occurred during the Medieval Warm Period between 900 and 989 before the present.