The signal of climate changes over the last two millennia in the Gulf of St. Lawrence, eastern Canada

The signal of climate changes over the last two millennia in the Gulf of St. Lawrence, eastern Canada
复制标题

加拿大东部圣劳伦斯湾过去两千年气候变化的信号

DOI:
10.1017/qua.2021.56
复制
发表时间:
2021
影响因子:
2.3
通讯作者:
Perner
Perner
中科院分区:
地球科学3区
文献类型:
--
作者:
de Vernal;Fréchette;Perner

文献摘要

参考文献

被引文献

相似文献

本文记录了圣劳伦斯湾中部地区过去两千年的气候变化,目的是确定和理解区域尺度上的自然气候变率和人为强迫的影响。利用在Laurentian海峡采集的复合海洋沉积物MSM46-03的孢粉含量(囊孢、花粉和孢子),以多年代际分辨率重建海洋和气候变化。从恐龙囊组合中重建了包括夏季盐度和温度、海冰覆盖和初级生产力在内的海面条件。结果表明,在1230 calyr BP (720 CE)之后,该地区出现了明显的降温趋势,降温幅度约为4°C,而在1780-1910 CE (170-40 calyr BP)期间出现了一个冷脉冲,这可能与小冰期的区域信号相对应。在这段寒冷的间歇期之后,气温迅速上升了约3摄氏度。在花粉组合中,过去1700年松树丰度的减少表明风的变化,可能是由于寒冷和干燥的北极气团增加了向南入侵到加拿大东南部。
Climate changes over the past two millennia in the central part of the Gulf of St. Lawrence are documented in this paper with the aim of determining and understanding the natural climate variability and the impact of anthropogenic forcing at a regional scale. The palynological content (dinocysts, pollen, and spores) of the composite marine sediment core MSM46-03 collected in the Laurentian Channel was used to reconstruct oceanographic and climatic changes with a multidecadal temporal resolution. Sea-surface conditions, including summer salinity and temperature, sea-ice cover, and primary productivity, were reconstructed from dinocyst assemblages. Results revealed a remarkable cooling trend of about 4°C after 1230 cal yr BP (720 CE) and a culmination with a cold pulse dated to 170–40 cal yr BP (1780–1910 CE), which likely corresponds to the regional signal of the Little Ice Age. This cold interval was followed by a rapid warming of about 3°C. In the pollen assemblages, the decrease of Pinus abundance over the past 1700 yr suggests changes in wind regimes, likely resulting from increased southerly incursions of cold and dry Arctic air masses into southeastern Canada.
劳伦森扇晚第四纪海面状况:来自颗石藻和恐龙囊组合的证据
DOI: --
发表时间: 2013
期刊:
影响因子: --
作者:
B. Balestra;A. Bertini;A. Vernal;S. Monechi;V. Reale
通讯作者: V. Reale
DOI: --
发表时间: 2002
期刊:
影响因子: --
作者:
A. Viau;K. Gajewski;P. Finès;David E. Atkinson;M. Sawada
通讯作者: M. Sawada
纽芬兰岛湾的孢粉学记录:全新世古海洋与气候变化的直接相关性
DOI: --
发表时间: 2003
期刊:
影响因子: --
作者:
E. Levac
通讯作者: E. Levac
有机壁甲藻包囊:海面条件的示踪剂
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
Fabienne Marret
通讯作者: Fabienne Marret
五大湖区第四纪花粉和孢子的关键
DOI: 10.5962/bhl.title.60762
发表时间: 1973
影响因子: 2.8
作者:
J. McAndrews;A. Berti;G. Norris
通讯作者: G. Norris