Paleoenvironmental record of Holocene storm event frequency in the lower Great Lakes

五大湖下游全新世风暴事件频率的古环境记录

基本信息

  • 批准号:
    RGPIN-2022-05333
  • 负责人:
  • 金额:
    $ 1.82万
  • 依托单位:
  • 依托单位国家:
    加拿大
  • 项目类别:
    Discovery Grants Program - Individual
  • 财政年份:
    2022
  • 资助国家:
    加拿大
  • 起止时间:
    2022-01-01 至 2023-12-31
  • 项目状态:
    已结题

项目摘要

Climate models predict an increase in the frequency of destructive tropical hurricanes and mid-latitude cyclonic storms in North America as a consequence of climate warming. The available historical record of past storm events (<150 years), however, is too short to evaluate climate model predictions. The NSERC-funded research will employ measurements of the physical and geochemical properties of lake sediments to better understand the frequency of storm events in the lower Great Lakes over the past 8000 years. During large storm events, storm waves over top sandy beach barriers depositing distinctive overwash sand layers in coastal lagoons. Storm layers are also deposited in lakes by the flood discharge of rivers. These deposits (tempestites) can be identified in sediment cores extracted from the lake bed based on their sedimentary characteristics (grain size, microfauna, magnetic properties) and geochemical composition. Radiocarbon dating of storm event layers provides a detailed chronological record of storms and extreme weather events during periods when Holocene climate was both warmer and dryer (the Hypsithermal) and cooler and wetter (Little Ice Age) than present. Boyce and research team (1 Ph.D., 2 M.Sc., 5 B.Sc. students) will investigate the geochemical and sedimentary properties of storm sediment layers in three Lake Ontario coastal lagoons (Frenchman's Bay, Pickering; Sandbanks, Prince Edward County) and in Rice Lake (Peterborough). The researchers will geochemically "finger-print" storm deposits by measuring the abundance of elements in core sediments using micro-X-ray-florescence (micro-XRF) core scanning technology available in the McMaster ITRAX facility. The ITRAX core scanner uses an X-ray beam to measure the abundance of a wide range of elements in core samples, including elements (e.g. Ti, K, Si, Rb, Zr) that are diagnostic of storm deposition. The scanner also records changes in the magnetization of the core and produces a high-resolution colour and X-ray images that can be used to identify changes in sediment grain size and composition. Using these combined properties, it is possible to detect very thin storm event layers (<0.2 mm), yielding highly-detailed records of past storm events. A detailed chronology of past Holocene (<8 Ka) storm events and climate variability will be obtained by radiocarbon dating of pollen in lake sediments. and 210-Pb dating. The high-resolution lake sediment record will allow McMaster researchers to assess whether the frequency of large storms events has been different in the past, and whether variability in storminess is linked to climate variables, such as past changes in temperature and precipitation. These data are critical for evaluating predicted changes in storm frequency and will assist in the development of emergency and infrastructure planning for heavily populated areas of the Great Lakes that are at risk from severe weather.
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项目成果

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Boyce, Joseph其他文献

Boyce, Joseph的其他文献

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{{ truncateString('Boyce, Joseph', 18)}}的其他基金

Sub-bottom seismic profiler for geoarchaeological and palaeoenvironmental research
用于地质考古和古环境研究的海底地震剖面仪
  • 批准号:
    RTI-2023-00409
  • 财政年份:
    2022
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Research Tools and Instruments
High-resolution paleoenvironmental record of Late Holocene storm activity in coastal lagoons
沿海泻湖全新世晚期风暴活动的高分辨率古环境记录
  • 批准号:
    RGPIN-2014-05829
  • 财政年份:
    2018
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Discovery Grants Program - Individual
High-resolution paleoenvironmental record of Late Holocene storm activity in coastal lagoons
沿海泻湖全新世晚期风暴活动的高分辨率古环境记录
  • 批准号:
    RGPIN-2014-05829
  • 财政年份:
    2017
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Discovery Grants Program - Individual
High-resolution paleoenvironmental record of Late Holocene storm activity in coastal lagoons
沿海泻湖全新世晚期风暴活动的高分辨率古环境记录
  • 批准号:
    RGPIN-2014-05829
  • 财政年份:
    2016
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Discovery Grants Program - Individual
High-resolution paleoenvironmental record of Late Holocene storm activity in coastal lagoons
沿海泻湖全新世晚期风暴活动的高分辨率古环境记录
  • 批准号:
    RGPIN-2014-05829
  • 财政年份:
    2015
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Discovery Grants Program - Individual
High-resolution paleoenvironmental record of Late Holocene storm activity in coastal lagoons
沿海泻湖全新世晚期风暴活动的高分辨率古环境记录
  • 批准号:
    RGPIN-2014-05829
  • 财政年份:
    2014
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Discovery Grants Program - Individual
Assessment of contaminant loadings in lake sediments using magnetic property measurements
使用磁特性测量评估湖泊沉积物中的污染物含量
  • 批准号:
    227508-2009
  • 财政年份:
    2013
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Discovery Grants Program - Individual
Assessment of contaminant loadings in lake sediments using magnetic property measurements
使用磁特性测量评估湖泊沉积物中的污染物含量
  • 批准号:
    227508-2009
  • 财政年份:
    2012
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Discovery Grants Program - Individual
Assessment of contaminant loadings in lake sediments using magnetic property measurements
使用磁特性测量评估湖泊沉积物中的污染物含量
  • 批准号:
    227508-2009
  • 财政年份:
    2011
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Discovery Grants Program - Individual
Assessment of contaminant loadings in lake sediments using magnetic property measurements
使用磁特性测量评估湖泊沉积物中的污染物含量
  • 批准号:
    227508-2009
  • 财政年份:
    2010
  • 资助金额:
    $ 1.82万
  • 项目类别:
    Discovery Grants Program - Individual

相似国自然基金

基于循证医学本体论的临床元数据语言研究
  • 批准号:
    30972549
  • 批准年份:
    2009
  • 资助金额:
    24.0 万元
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