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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Magnitude of the 8.2 ka event freshwater forcing based on stable isotope modelling and comparison to future Greenland melting

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Author(s):
Aguiar, Wilton [1] ; Meissner, Katrin J. [2, 3] ; Montenegro, Alvaro [4] ; Prado, Luciana [5, 6] ; Wainer, Ilana [5] ; Carlson, Anders E. [7] ; Mata, Mauricio M. [1]
Total Authors: 7
Affiliation:
[1] Univ Fed Rio Grande FURG, Inst Oceanog, Lab Estudos Oceanos & Clima, BR-96203900 Rio Grande, RS - Brazil
[2] Univ New South Wales, Climate Change Res Ctr, Sydney, NSW - Australia
[3] Univ New South Wales, ARC Ctr Excellence Climate Extremes, Sydney, NSW - Australia
[4] Ohio State Univ, Dept Geog, Columbus, OH 43210 - USA
[5] Univ Sao Paulo, Inst Oceanog, BR-05508120 Sao Paulo - Brazil
[6] Univ Brasilia, Inst Geociencias, BR-70297400 Brasilia, DF - Brazil
[7] Oregon Glaciers Inst, Corvallis, OR - USA
Total Affiliations: 7
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 11, n. 1 MAR 9 2021.
Web of Science Citations: 0
Abstract

The northern hemisphere experienced an abrupt cold event similar to 8200 years ago (the 8.2 ka event) that was triggered by the release of meltwater into the Labrador Sea, and resulting in a weakening of the poleward oceanic heat transport. Although this event has been considered a possible analogue for future ocean circulation changes due to the projected Greenland Ice Sheet (GIS) melting, large uncertainties in the amount and rate of freshwater released during the 8.2 ka event make such a comparison difficult. In this study, we compare sea surface temperatures and oxygen isotope ratios from 28 isotope-enabled model simulations with 35 paleoproxy records to constrain the meltwater released during the 8.2 ka event. Our results suggest that a combination of 5.3 m of meltwater in sea level rise equivalent (SLR) released over a thousand years, with a short intensification over similar to 130 years (an additional 2.2 m of equivalent SLR) due to routing of the Canadian river discharge, best reproduces the proxy anomalies. Our estimate is of the same order of magnitude as projected future GIS melting rates under the high emission scenario RCP8.5. (AU)

FAPESP's process: 18/14789-9 - Impact of volcanism on the South American Monsoon System and its relationship with the Atlantic Ocean sea surface temperature modes of variability
Grantee:Ilana Elazari Klein Coaracy Wainer
Support type: Regular Research Grants
FAPESP's process: 19/08247-1 - Mid-Holocene Tropical Atlantic Ocean links to drying of the Amazon and Greening of the Sahara
Grantee:Ilana Elazari Klein Coaracy Wainer
Support type: Regular Research Grants