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Diatom records of Holocene climatic and hydrological changes in the western Hudson Bay region, Canada

机译:加拿大哈德逊湾西部地区全新世气候和水文变化的硅藻记录

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摘要

Rapidly changing climates in northern Canada make the western Hudson Bay region an area of high importance for paleoenvironmental studies. Long-term changes in assemblages of diatoms (microscopic algae) were analyzed from lake sediment cores from Baker Lake, Nunavut, and Lake AT01, northern Ontario, to track responses to past environmental changes. Diatom assemblages dating to 6700 years ago in AT01 were initially characterized by cold-tolerant Fragilarioid assemblages, but shifted to an assemblage dominated by large benthic species and Cymbella diluviana consistent with the timing of the Holocene Thermal Maximum after 6300 years BP. A possible drainage event in Lake AT01 may have added significant hydrologic control on the diatom assemblages. The post-industrial period is marked by the largest compositional shifts in both records. Assemblages during the 20th century are indicative of reduced ice cover and enhanced thermal stratification linked to a climate regime shift noted in Hudson Bay since the mid-1990's.
机译:加拿大北部气候的快速变化使哈德逊湾西部地区成为古环境研究的重要领域。分析了努纳武特州贝克湖和安大略省北部AT01湖沉积物核心中的硅藻(微观藻类)组合的长期变化,以追踪对过去环境变化的响应。始于6700年前AT01的硅藻组合物最初以耐寒的Fragilarioid组合物为特征,但后来转变为以大型底栖生物和Dimbviana为主的组合物,与6300年BP之后的全新世热最大值相符。 AT01湖中可能发生的排水事件可能对硅藻群落增加了重要的水文控制。后工业时期是两个记录中最大的成分变化标志。自20世纪1990年代中期以来,哈德逊湾(Hudson Bay)注意到气候变化,这表明20世纪的集会表明冰盖减少和热分层增加。

著录项

  • 作者

    Friel, Charlotte Ellen.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Paleoclimate science.;Paleoecology.;Climate change.
  • 学位 M.Sc.
  • 年度 2011
  • 页码 186 p.
  • 总页数 186
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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