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Marine Radiocarbon Reservoir Age Along the Chilean Continental Margin

Published online by Cambridge University Press:  01 October 2018

Víctor Merino-Campos ,
Ricardo De Pol-Holz Open the ORCID record for Ricardo De Pol-Holz [Opens in a new window] ,
John Southon ,
Claudio Latorre  and
Silvana Collado-Fabbri
Víctor Merino-Campos
Affiliation:
Postgraduate School in Oceanography, Faculty of Natural and Oceanographic Sciences, Universidad de Concepción, Chile
Ricardo De Pol-Holz*
Affiliation:
Dirección Programas Antárticos y Subantárticos and Center for Climate and Resilience Research (CR)2, Universidad de Magallanes, Punta Arenas, Chile
John Southon
Affiliation:
Department of Earth System Science, University of California, Irvine, USA
Claudio Latorre
Affiliation:
Department of Ecology, Pontificia Universidad Católica de Chile, Santiago, Chile
Silvana Collado-Fabbri
Affiliation:
Postgraduate School in Oceanography, Faculty of Natural and Oceanographic Sciences, Universidad de Concepción, Chile
*
*Corresponding author. Email: [email protected].
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Abstract

We present 37 new radiocarbon (14C) measurements from mollusk shells fragments sampled along the Chilean continental margin and stored in museum collections with known calendar age. These measurements were used to estimate the modern pre-bomb regional marine 14C age deviations from the global ocean reservoir (∆R). Together with previously published data, we calculated regional mean ∆R values for five oceanographic macro regions along the coast plus one for a mid-latitude open ocean setting. In general, upwelling regions north of 42ºS show consistent although sometimes highly variable ∆R values with regional averages ranging from 141 to 196 14C yr, whereas the mid-latitude open ocean location of the Juan Fernández archipelago and the southern Patagonian region show minor, ∆R of 40±38 14C yr, and 52±47 14C yr respectively. We attribute the alongshore decreasing pattern toward higher latitudes to the main oceanographic features along the Chilean coast such as perennial coastal upwelling in northern zone, seasonally variable upwelling at the central part and the large freshwater influence upon the southern Patagonian channels.

Keywords

Chileradiocarbon AMS datingreservoir correctionreservoir effectupwelling
Type
Research Article
Information
Radiocarbon , Volume 61 , Issue 1 , February 2019 , pp. 195 - 210
Copyright
© 2018 by the Arizona Board of Regents on behalf of the University of Arizona 

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