Three amphi-Atlantic century-scale cold events during the Bølling-Allerød warm period
Three amphi-Atlantic century-scale cold events during the Bølling-Allerød warm period
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Bølling-Allerød 暖期期间发生的三起两栖大西洋世纪级寒冷事件
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
U. Eicher
中科院分区：
文献类型：
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作者：
Zicheng Yu;U. Eicher
加拿大南部克劳福德湖沉积物中碳酸盐的氧同位素组成揭示了末次冰消期期间的多个气候事件，包括博林变暖、阿勒罗德内寒冷期、新仙女木期、前寒带振荡和全新世早期8.2-ka冷却。在这里，我们展示了博林-阿勒罗德暖期期间该地点氧同位素的高分辨率记录（约 50 年采样间隔），并通过将其与北大西洋周围的其他记录进行比较来讨论其重要性。这些新数据显示了三个世纪规模的寒冷事件，包括博林内寒冷期、老仙女木期和阿勒罗德内寒冷期。这些气候事件在顺序和相对强度上与格陵兰冰芯、欧洲湖泊沉积物和大西洋沉积物中发现的气候事件密切相关。 GISP2 冰芯的冰川化学记录中的三个类似振荡意味着大气环流模式的变化。这些气候事件的两岸分布表明这些事件可能起源于北大西洋，并且气候信号是通过大气传播的。
Oxygen isotope composition of carbonates in the sediments of Crawford Lake, southern Canada, reveals multiple climatic events during the last deglaciation, including the Bolling warming, intra-Allerod cold period, Younger Dryas, Preboreal Oscillation, and early-Holocene 8.2-ka cooling. Here we present a high-resolution record (~50-yr sampling interval) of oxygen isotopes from this site during the Bolling-Allerod warm period and discuss its significance by comparing it with other records around the North Atlantic. These new data show three century-scale cold events, including the intra-Bolling cold period, Older Dryas, and intra-Allerod cold period. These climatic events correlate well in sequence and relative magnitude with those found in Greenland ice cores, European lacustrine sediments, and Atlantic Ocean sediments. Three similar oscillations in glaciochemical records from GISP2 ice core imply shift in atmospheric circulation patterns. The amphi-Atlantic distribution of these climate events suggests that these events likely originated from the North Atlantic Ocean and that climatic signals were transmitted through the atmosphere.