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North Atlantic Deep Water Production during the Last Glacial Maximum

Texto completo
Autor(es):
Howe, Jacob N. W. [1] ; Piotrowski, Alexander M. [1] ; Noble, Taryn L. [1, 2] ; Mulitza, Stefan [3] ; Chiessi, Cristiano M. [4] ; Bayon, Germain [5]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ - England
[2] Univ Tasmania, IMAS, Hobart, Tas 7001 - Australia
[3] Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str, D-28359 Bremen - Germany
[4] Univ Sao Paulo, Sch Arts Sci & Humanities, Av Arlindo Bettio 1000, BR-03828000 Sao Paulo, SP - Brazil
[5] IFREMER, Unite Rech Geosci Marines, F-29280 Plouzane - France
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: NATURE COMMUNICATIONS; v. 7, JUN 2016.
Citações Web of Science: 15
Resumo

Changes in deep ocean ventilation are commonly invoked as the primary cause of lower glacial atmospheric CO2. The water mass structure of the glacial deep Atlantic Ocean and the mechanism by which it may have sequestered carbon remain elusive. Here we present neodymium isotope measurements from cores throughout the Atlantic that reveal glacial-interglacial changes in water mass distributions. These results demonstrate the sustained production of North Atlantic Deep Water under glacial conditions, indicating that southern-sourced waters were not as spatially extensive during the Last Glacial Maximum as previously believed. We demonstrate that the depleted glacial delta C-13 values in the deep Atlantic Ocean cannot be explained solely by water mass source changes. A greater amount of respired carbon, therefore, must have been stored in the abyssal Atlantic during the Last Glacial Maximum. We infer that this was achieved by a sluggish deep overturning cell, comprised of well-mixed northern-and southern-sourced waters. (AU)

Processo FAPESP: 12/17517-3 - Resposta da porção oeste do Oceano Atlântico às mudanças na circulação meridional do Atlântico: variabilidade milenar a sazonal
Beneficiário:Cristiano Mazur Chiessi
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores