The glacial lakes of northern Quebec-Labrador and their contribution to the meltwater discharges of the late deglaciation and early Holocene climate interval

魁北克-拉布拉多北部的冰川湖及其对冰川消融晚期和全新世早期气候区间融水排放的贡献

基本信息

  • 批准号:
    RGPIN-2017-05431
  • 负责人:
  • 金额:
    $ 2.33万
  • 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

The climate variability of the last 15,000 to 7,000 years is commonly linked to the drainage of large glacial lakes that had developed at the margins of the decaying ice masses of the last Ice Age. These massive outbursts of meltwater are believed to have disturbed the North Atlantic Ocean circulation, which plays a fundamental role in regulating Earth's climate. These former climate-forcing events are now under focus due to a growing number of studies showing that the present-day increase in freshwater releases from the melting of Greenland and other Arctic glaciers may potentially lead to a slowdown of the ocean thermohaline circulation and cause important climate feedbacks. In northern Quebec and Labrador, the last deglaciation led to the formation of several large glacial lakes that invaded the main river valleys around Ungava Bay. These ice-dammed lakes drained into the Labrador Sea where the repeated and sustained meltwater discharges likely destabilized the ocean surface conditions and altered/suppressed deepwater formation taking place in this key sector of the ocean. Although the drainage of these glacial lakes may form an outstanding analogue for modern processes, assessing the precise impact of these meltwater discharges on the ocean system and climate is prevented by uncertainties on the pattern of ice retreat and the lack of constraints on the configuration (meltwater volumes) of these lakes. Furthermore, the timing of the main stages of the deglaciation remains poorly constrained. This research program is based on the integration of field-based investigations and novel analytical methods to the study of the sediment and geomorphic records of north-central Ungava and Labrador. The main objectives are to: (1) characterize the dynamics and evolution of the ice margin during the deglaciation through systematic mapping and geochemical analyses of glacial sediments and landforms; (2) reconstruct the extent and depth of 8 glacial lakes though mapping and elevation measurements of raised shorelines; and (3) provide realistic estimates for the lake meltwater volumes using GIS models. Cosmogenic nuclide dating of shorelines and outburst flood deposits will further constrain the chronology of the lake development and drainage, which should contribute to place these meltwater discharges within the North Atlantic deglaciation framework. Altogether, this research program will improve the accuracy of paleogeographic reconstructions by providing a comprehensive knowledge of ice-flow patterns and ice sheet dynamics, which are critical elements in both fundamental and applied sciences. These results will also improve our understanding of the role of meltwater discharges in past climate perturbations and refine boundary conditions that are critically required by paleo/predictive climate models to fully assess the impact of freshwater inputs on ocean circulation and climate.
过去15,000至7,000年的气候变化通常与大型冰川湖泊的排水有关,这些湖泊是在上一次冰河时代腐烂的冰块边缘形成的。这些大规模的融化水喷发被认为扰乱了北大西洋环流,北大西洋环流在调节地球气候方面发挥着基础性作用。由于越来越多的研究表明,格陵兰和其他北极冰川融化导致的淡水释放增加,可能会潜在地导致海洋温盐循环放缓,并造成重要的气候反馈,因此这些以前的气候强迫事件现在成为关注的焦点。在魁北克北部和拉布拉多,最后一次冰川消融导致了几个大型冰川湖泊的形成,这些湖泊侵入了昂加瓦湾周围的主要河谷。这些冰封的湖泊流入拉布拉多海,在那里反复和持续的融水排放可能会破坏海洋表面的稳定,并改变/抑制在这一海洋关键部分发生的深水形成。虽然这些冰川湖泊的排水可能形成现代过程的杰出类比,但由于冰川退缩模式的不确定性以及对这些湖泊的形态(融水量)缺乏限制,因此无法评估这些融水排放对海洋系统和气候的准确影响。此外,冰川消融的主要阶段的时间仍然没有得到很好的限制。这项研究方案综合了实地调查和新的分析方法,以研究翁加瓦和拉布拉多中北部的沉积物和地貌记录。主要目标是:(1)通过对冰川沉积物和地貌的系统测绘和地球化学分析,描述冰缘在消融期间的动态和演变;(2)通过测绘和高程测量海岸线的抬高,重建8个冰川湖泊的范围和深度;(3)利用地理信息系统模型,对湖泊融水水量提供现实估计。对海岸线和暴发洪水沉积的宇宙核素测年将进一步限制湖泊开发和排水的年代学,这应有助于将这些融水排放置于北大西洋冰川消融框架内。总而言之,这项研究计划将通过提供冰流模式和冰盖动力学的全面知识来提高古地理重建的准确性,这些都是基础科学和应用科学的关键要素。这些结果还将提高我们对融水排放在过去气候扰动中的作用的理解,并完善古/预测气候模式至关重要的边界条件,以充分评估淡水输入对海洋环流和气候的影响。

项目成果

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Roy, Martin其他文献

Skills trained by coaches of Canadian male volleyball teams: A comparison with long-term athlete development guidelines
A detailed lake-level reconstruction shows evidence for two abrupt lake drawdowns in the late-stage history of the eastern Lake Agassiz-Ojibway basin
  • DOI:
    10.1016/j.quascirev.2020.106327
  • 发表时间:
    2020-06-15
  • 期刊:
  • 影响因子:
    4
  • 作者:
    Godbout, Pierre-Marc;Roy, Martin;Veillette, Jean J.
  • 通讯作者:
    Veillette, Jean J.
1-km resolution rebound surfaces and paleotopography of glaciated North America since the Last Glacial Maximum.
  • DOI:
    10.1038/s41597-023-02566-5
  • 发表时间:
    2023-10-23
  • 期刊:
  • 影响因子:
    9.8
  • 作者:
    Godbout, Pierre-Marc;Brouard, Etienne;Roy, Martin
  • 通讯作者:
    Roy, Martin
Time perception disorders are related to working memory impairment in schizophrenia
  • DOI:
    10.1016/j.psychres.2012.06.008
  • 发表时间:
    2012-12-30
  • 期刊:
  • 影响因子:
    11.3
  • 作者:
    Roy, Martin;Grondin, Simon;Roy, Marc-Andre
  • 通讯作者:
    Roy, Marc-Andre
The drainage of Lake Ojibway in glaciolacustrine sediments of northern Ontario and Quebec, Canada
  • DOI:
    10.1111/bor.12101
  • 发表时间:
    2015-04-01
  • 期刊:
  • 影响因子:
    2.2
  • 作者:
    Daubois, Virginie;Roy, Martin;Menard, Maxime
  • 通讯作者:
    Menard, Maxime

Roy, Martin的其他文献

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{{ truncateString('Roy, Martin', 18)}}的其他基金

The glacial lakes of northern Quebec-Labrador and their contribution to the meltwater discharges of the late deglaciation and early Holocene climate interval
魁北克-拉布拉多北部的冰川湖及其对冰川消融晚期和全新世早期气候区间融水排放的贡献
  • 批准号:
    RGPIN-2017-05431
  • 财政年份:
    2021
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
The glacial lakes of northern Quebec-Labrador and their contribution to the meltwater discharges of the late deglaciation and early Holocene climate interval
魁北克-拉布拉多北部的冰川湖及其对冰川消融晚期和全新世早期气候区间融水排放的贡献
  • 批准号:
    RGPIN-2017-05431
  • 财政年份:
    2020
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
The glacial lakes of northern Quebec-Labrador and their contribution to the meltwater discharges of the late deglaciation and early Holocene climate interval
魁北克-拉布拉多北部的冰川湖及其对冰川消融晚期和全新世早期气候区间融水排放的贡献
  • 批准号:
    RGPIN-2017-05431
  • 财政年份:
    2019
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
The glacial lakes of northern Quebec-Labrador and their contribution to the meltwater discharges of the late deglaciation and early Holocene climate interval
魁北克-拉布拉多北部的冰川湖及其对冰川消融晚期和全新世早期气候区间融水排放的贡献
  • 批准号:
    RGPIN-2017-05431
  • 财政年份:
    2018
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
The glacial lakes of northern Quebec–Labrador and their contribution to the meltwater discharges of the late deglaciation and early Holocene climate interval
魁北克北部拉布拉多冰川湖及其对冰川消融晚期和全新世早期气候区间融水排放的贡献
  • 批准号:
    RGPIN-2017-05431
  • 财政年份:
    2017
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
Evolution of glacial Lake Ojibway and impact of meltwater discharges on early Holocene abrupt climate changes
奥及布韦冰川湖的演化及融水排放对全新世早期气候突变的影响
  • 批准号:
    327685-2012
  • 财政年份:
    2016
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
Evolution of glacial Lake Ojibway and impact of meltwater discharges on early Holocene abrupt climate changes
奥及布韦冰川湖的演化及融水排放对全新世早期气候突变的影响
  • 批准号:
    327685-2012
  • 财政年份:
    2015
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
Evolution of glacial Lake Ojibway and impact of meltwater discharges on early Holocene abrupt climate changes
奥及布韦冰川湖的演化及融水排放对全新世早期气候突变的影响
  • 批准号:
    327685-2012
  • 财政年份:
    2014
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
Evolution of glacial Lake Ojibway and impact of meltwater discharges on early Holocene abrupt climate changes
奥及布韦冰川湖的演化及融水排放对全新世早期气候突变的影响
  • 批准号:
    327685-2012
  • 财政年份:
    2013
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
Evolution of glacial Lake Ojibway and impact of meltwater discharges on early Holocene abrupt climate changes
奥及布韦冰川湖的演化及融水排放对全新世早期气候突变的影响
  • 批准号:
    327685-2012
  • 财政年份:
    2012
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual

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人类世的北部湖泊:研究湖泊生态系统在广泛的空间和时间尺度上的变化
  • 批准号:
    305407-2017
  • 财政年份:
    2022
  • 资助金额:
    $ 2.33万
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    Discovery Grants Program - Northern Research Supplement
Climate change and catchment controls on the mercury cycle of northern lakes
气候变化和流域对北方湖泊汞循环的控制
  • 批准号:
    RGPIN-2018-06535
  • 财政年份:
    2022
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Revealing the dark side of the lake: How winter dynamics control summer conditions in northern prairie lakes
揭示湖泊的阴暗面:冬季动态如何控制北部草原湖泊的夏季条件
  • 批准号:
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Characterizing carbon and water balance of shallow productive lakes in a northern floodplain landscape
北部洪泛区景观浅层生产力湖泊的碳水平衡特征
  • 批准号:
    547500-2020
  • 财政年份:
    2022
  • 资助金额:
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Northern Lakes as Sentinels of Environmental Changes
北部湖泊作为环境变化的哨兵
  • 批准号:
    RGPIN-2020-05573
  • 财政年份:
    2022
  • 资助金额:
    $ 2.33万
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    Discovery Grants Program - Individual
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揭示湖泊的阴暗面:冬季动态如何控制北部草原湖泊的夏季条件
  • 批准号:
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  • 财政年份:
    2021
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    $ 2.33万
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    Discovery Grants Program - Individual
Characterizing carbon and water balance of shallow productive lakes in a northern floodplain landscape
北部洪泛区景观浅层生产力湖泊的碳水平衡特征
  • 批准号:
    547500-2020
  • 财政年份:
    2021
  • 资助金额:
    $ 2.33万
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Contemporary and paleolimnological approaches for determining effects of multiple stressors on shallow northern lakes
确定多种压力因素对北部浅湖影响的当代和古湖泊学方法
  • 批准号:
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    2021
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    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Northern Research Supplement
Climate change and catchment controls on the mercury cycle of northern lakes
气候变化和流域对北方湖泊汞循环的控制
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    RGPIN-2018-06535
  • 财政年份:
    2021
  • 资助金额:
    $ 2.33万
  • 项目类别:
    Discovery Grants Program - Individual
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