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- W2094030168 abstract "The abrupt delivery of large amounts of freshwater to the North Atlantic in the form of water or icebergs has been thought to lead to significant climate change, including abrupt slowing of the Atlantic Ocean meridional overturning circulation. In this paper we examine intermediate complexity coupled modelling evidence to estimate the rates of change, and recovery, in oceanic climate that would be expected for such events occurring during glacial times from likely sources around the North Atlantic and Arctic periphery. We show that rates of climate change are slower for events with a European or Arctic origin. Palaeoceanographic data are presented to consider, through the model results, the origin and likely strength of major ice-rafting, or Heinrich, events during the last glacial period. We suggest that Heinrich events H1–H3 are likely to have had a significant contribution from an Arctic source as well as Hudson Strait, leading to the observed climate change. In the case of H1 and H2, we hypothesise that this secondary input is from a Laurentide Arctic source, but the dominant iceberg release for H3 is hypothesised to derive from the northern Fennoscandian Ice Sheet, rather than Hudson Strait. Earlier Heinrich events are suggested to be predominantly Hudson Strait in origin, with H6 having the lowest climate impact, and hence iceberg flux, but H4 having a climate signal of geographically variable length. We hypothesise that this is linked to a combination of climate-affecting events occurring around the globe at this time, and not just of Laurentide origin." @default.
- W2094030168 created "2016-06-24" @default.
- W2094030168 creator A5023752253 @default.
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- W2094030168 date "2011-12-01" @default.
- W2094030168 modified "2023-09-30" @default.
- W2094030168 title "Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events" @default.
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- W2094030168 doi "https://doi.org/10.1016/j.gloplacha.2010.11.001" @default.
- W2094030168 hasPublicationYear "2011" @default.
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