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Reconstructing Deglacial Circulation Changes in the Northern North Atlantic and Nordic Seas: Δ14C, δ13C, Temperature and δ18OSW Evidence

Thornalley, DJR; (2015) Reconstructing Deglacial Circulation Changes in the Northern North Atlantic and Nordic Seas: Δ14C, δ13C, Temperature and δ18OSW Evidence. Nova Acta Leopoldina , 121 (408) pp. 223-228. Green open access

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Abstract

Ice-core records have revealed that atmospheric CO2 has varied during glacial-interglacial by ~90 ppm, with rapid increases in atmospheric CO2 occurring during deglaciations. It is widely accepted that changes in the amount of carbon stored in the deep ocean play a leading role in explaining these cycles, primarily because of the size of the deep ocean carbon reservoir (~60 times that of the atmosphere) and the millennial timescales on which it interacts with the atmosphere (Sigman et al. 2010). To gain an understanding of how changes in deep ocean carbon storage may have controlled past variations in atmospheric CO2, we ideally require robust and detailed proxy records of the properties and ventilation pathways of the deep ocean across glacial-interglacial transitions. The deep ocean is ventilated in the high latitudes, where dense isopycnals outcrop at the sea surface. Therefore to help understand deep ocean-atmosphere exchange we require reconstructions of past hydrographic changes at these high latitude ventilation sites. Furthermore, constraints on the timing and phasing of deglacial changes in these regions enable us to evaluate hypotheses regarding the underlying mechanisms of the glacial termination.

Type: Article
Title: Reconstructing Deglacial Circulation Changes in the Northern North Atlantic and Nordic Seas: Δ14C, δ13C, Temperature and δ18OSW Evidence
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.leopoldina.org/uploads/tx_leopublicatio...
Language: English
Additional information: Copyright © 2015 Deutsche Akademie der Naturforscher Leopoldina e. V. – Nationale Akademie der Wissenschaften.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/1474082
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