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Holocene palaeoenvironmental records from two subalpine lakes in southern British Columbia, based on chironomid and pollen analyses.

机译:来自不列颠哥伦比亚省南部的两个亚高山湖泊的全新世古环境记录,基于尺虫和花粉分析。

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摘要

Holocene climate in British Columbia has been mainly reconstructed from palynological research. In this study fossil Chironomidae were analyzed from sediments of two subalpine lakes, in order to reconstruct palaeoenvironmental changes. Midge stratigraphies and a midge-temperature inference model (based on a 51 lake training set for southern British Columbia) were used to infer mean July air temperatures and reconstruct Holocene climatic regimes at each lake.;Chaoborus and Microtendipes are abundant during the early Holocene at Frozen Lake, suggesting warmer temperatures than present. Cold-stenotherms subsequently increase as temperate midge taxa decline, indicating a cooling trend to the present.;Warm-water indicators, are present in the early Holocene at Eagle Lake, but disappeared during the mid-Holocene when temperatures likely cooled. A resurgence of warm indicators in the late Holocene contradicts the evidence of continued cooling typically seen in other reconstructions. (Abstract shortened by UMI.).
机译:不列颠哥伦比亚省的全新世气候主要是通过孢粉学研究重建的。在这项研究中,从两个亚高山湖泊的沉积物中分析了化龙科,以重建古环境的变化。地层和mid温度推断模型(基于不列颠哥伦比亚省南部的51个湖泊训练集)被用来推断7月平均气温并重建每个湖的全新世气候体系。冰封湖,表明温度比现在高。随后,随着温带中类群的减少,冷的热度增加,表明目前有降温的趋势。暖水指标出现在Eagle Lake的全新世早期,但在全新世中期,温度可能下降时消失了。全新世晚期温暖指标的复苏与其他重建过程中通常出现的持续降温的证据相矛盾。 (摘要由UMI缩短。)。

著录项

  • 作者

    Rosenberg, Sandra M.;

  • 作者单位

    Simon Fraser University (Canada).;

  • 授予单位 Simon Fraser University (Canada).;
  • 学科 Paleontology.;Limnology.
  • 学位 M.Sc.
  • 年度 2002
  • 页码 111 p.
  • 总页数 111
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 能源与动力工程;
  • 关键词

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