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首页> 外文期刊>Journal of quaternary science: JQS >Evaluating long-term regional climate variability in the maritime region of the St. Lawrence North Shore (eastern Canada) using a multi-site comparison of peat-based paleohydrological records
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Evaluating long-term regional climate variability in the maritime region of the St. Lawrence North Shore (eastern Canada) using a multi-site comparison of peat-based paleohydrological records

机译：使用基于泥炭的古水文记录的多站点比较，评估圣劳伦斯北岸（加拿大东部）海域的长期区域气候变化

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摘要

This study presents paleohydrological reconstructions from ombrotrophic peatlands (bogs) along the north shore of the Estuary and the Gulf of St. Lawrence in eastern Canada. Past water table depths were reconstructed based on testate amoebae analyses within four peatlands from two maritime ecoclimatic regions (boreal and subarctic) using a new transfer function. The comparison of multiple peat-based paleohydrological records was used to distinguish climate-driven changes from variations related to site-specific factors. Coherence between the water table reconstructions at the regional scale suggests a common climatic influence on bog paleohydrology but there are inconsistencies which also suggest an influence of non-climatic factors (e.g. internal peatland processes and feedbacks). The surface drying and increased hydrological variability after 3000 cal a BP in the studied bogs coincide with the transition from the Holocene Climatic Optimum to the Neoglacial cooling documented by proxy climate records in eastern Canada. The bogs of Havre St-Pierre have experienced major drying during the late Holocene, indicating important annual-to-centennial water deficits at the peatland surface. Regional differences in the magnitude of the hydrological fluctuations may result from distinctive climatic conditions or could indicate that bog surface wetness in the Gulf of St. Lawrence was more sensitive to past climate changes.
机译：这项研究提出了沿河口北岸和加拿大东部圣劳伦斯湾的非营养营养泥炭地（沼泽）的古水文重建。使用新的传递函数，基于两个海洋生态气候区域（北方和北极）的四个泥炭地内的遗留物变形虫分析，重建了过去的地下水位深度。多个基于泥炭的古水文记录的比较用于区分气候驱动的变化和与特定地点因素相关的变化。区域范围内地下水位重建之间的连贯性暗示了对沼泽古水文学的共同气候影响，但也存在不一致之处，这也暗示了非气候因素的影响（例如泥炭地内部过程和反馈）。在加拿大沼泽中，经过3000 cal a BP后，地表干燥和水文变异性增加，这与加拿大东部代用气候记录所记录的全新世气候最佳向新冰期冷却的转变相吻合。全新世晚期，阿弗尔圣皮埃尔（Havre St-Pierre）的沼泽经历了严重的干燥，表明泥炭地表层的逐年至百年重要的缺水现象。水文波动幅度的区域差异可能是由独特的气候条件引起的，或者可能表明圣劳伦斯湾的沼泽地表湿气对过去的气候变化更为敏感。

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