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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
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]
Número total de Autores: 7
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 7
Tipo de documento: Artigo Científico
Fonte: SCIENTIFIC REPORTS; v. 11, n. 1 MAR 9 2021.
Citações Web of Science: 0
Resumo

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)

Processo FAPESP: 18/14789-9 - Impacto do vulcanismo no sistema de Monção da América do Sul e seu vínculo com os modos de variabilidade do Atlântico Sul baseados em temperatura de superfície
Beneficiário:Ilana Elazari Klein Coaracy Wainer
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 19/08247-1 - Relação do oceano Atlântico Tropical com a seca da Amazonia e florescimento da região do Sahara no Holoceno médio
Beneficiário:Ilana Elazari Klein Coaracy Wainer
Linha de fomento: Auxílio à Pesquisa - Regular