Three amphi-Atlantic century-scale cold events during the Bølling-Allerød warm period
Oxygen isotope composition of carbonates in the sediments of Crawford Lake, southern Canada, reveals multiple climatic events during the last deglaciation, including the Bølling warming, intra-Allerød cold period, Younger Dryas, Preboreal Oscillation, and early-Holocene 8.2-ka cooling. Here we prese...
| Published in: | Géographie physique et Quaternaire |
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| Main Authors: | , |
| Format: | Text |
| Language: | English |
| Published: |
Les Presses de l'Université de Montréal
2001
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| Subjects: | |
| Online Access: | http://id.erudit.org/iderudit/008301ar https://doi.org/10.7202/008301ar |
| Summary: | Oxygen isotope composition of carbonates in the sediments of Crawford Lake, southern Canada, reveals multiple climatic events during the last deglaciation, including the Bølling warming, intra-Allerød 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 Bølling-Allerød 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-Bølling cold period, Older Dryas, and intra-Allerød 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. La composition des isotopes de l’oxygène dans les carbonates des sédiments du Crawford Lake, dans le sud du Canada, dévoilent l’existence de multiples phases climatiques survenues au cours de la dernière glaciation, incluant le réchauffement du Bølling, la période froide de l’intra-Allerød, le Dryas récent, l’Oscillation du pré-Boréal et le refroidissement de l’Holocène inférieur, à 8,2 ka. Les auteurs présentent un relevé précis de données (intervalle de ~50 ans) des isotopes de l’oxygène tirés du site à l’étude, au cours de la période chaude, et étudient sa signification par rapport aux autres relevés de l’Atlantique Nord. Ces nouvelles données révèlent l’existence de trois phases froides à échelle séculaire, y compris la période froide de l’intra-Bølling, le Dryas ancien et la période froide de l’intra-Allerød. Ces événements climatiques concordent bien avec la séquence et ... |
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