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Late Holocene precipitation variability recorded in the sediments of Reloncaví Fjord (41°S, 72°W), Chile

Published online by Cambridge University Press:  20 January 2017

Lorena Rebolledo ,
Carina B. Lange ,
Sébastien Bertrand ,
Práxedes Muñoz ,
Marco Salamanca ,
Pablo Lazo ,
José L. Iriarte ,
Gabriel Vargas ,
Silvio Pantoja  and
Laurent Dezileau
Lorena Rebolledo*
Affiliation:
Centro de Investigación Oceanográfica en el Pacífico Sur-Oriental (COPAS), Universidad de Concepción, Chile Programa COPAS Sur-Austral, Universidad de Concepción, Chile Departamento de Oceanografía, Universidad de Concepción, Chile
Carina B. Lange
Affiliation:
Centro de Investigación Oceanográfica en el Pacífico Sur-Oriental (COPAS), Universidad de Concepción, Chile Programa COPAS Sur-Austral, Universidad de Concepción, Chile Departamento de Oceanografía, Universidad de Concepción, Chile
Sébastien Bertrand
Affiliation:
Renard Centre of Marine Geology, Ghent University, Belgium
Práxedes Muñoz
Affiliation:
Departamento de Biología Marina, Facultad de Ciencias del Mar, Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Universidad Católica del Norte, Coquimbo, Chile
Marco Salamanca
Affiliation:
Departamento de Oceanografía, Universidad de Concepción, Chile Programa de Monitoreo del Ambiente Marino (PROMNA), Universidad de Concepción, Chile
Pablo Lazo
Affiliation:
Departamento de Oceanografía, Universidad de Concepción, Chile
José L. Iriarte
Affiliation:
Programa COPAS Sur-Austral, Universidad de Concepción, Chile Instituto de Acuicultura, Universidad Austral de Chile, Sede Puerto Montt, Chile
Gabriel Vargas
Affiliation:
Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Chile
Silvio Pantoja
Affiliation:
Centro de Investigación Oceanográfica en el Pacífico Sur-Oriental (COPAS), Universidad de Concepción, Chile Programa COPAS Sur-Austral, Universidad de Concepción, Chile Departamento de Oceanografía, Universidad de Concepción, Chile
Laurent Dezileau
Affiliation:
Université de Montpellier 2, 34095 Montpellier cedex 05, France
*
*Corresponding author at: Centro de Investigación Oceanográfica en el Pacífico Sur-Oriental (COPAS), Universidad de Concepción, Chile.E-mail address:[email protected] (L. Rebolledo).
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Abstract

We present reconstructions of late Holocene changes in the source of organic matter and siliceous export production in the Relocanví Fjord (41°S, 72°W), Northern Chilean Patagonia, based on organic carbon content, δ13Corg, N/C ratio, diatom assemblages and biogenic silica contents from three sediment cores. The age models are based on a combination of 210Pb profiles, AMS 14C dating, and on the first occurrence of the diatom Rhizosolenia setigera f. pungens, as a stratigraphic marker in the fjords. The cores span the last 300 to 700 yr. Diatoms dominate the siliceous assemblages in the three cores (98% on average). Our results suggest that precipitation seasonality in the region of Reloncaví was high in CE 1300–1400 and CE 1700–1850, with a clear decreasing trend since CE 1850. The latter trend is in agreement with instrumental records and tree-ring reconstructions. These fluctuations seem to be associated with the Southern Annular Mode (SAM).

Keywords

Reloncaví FjordPatagoniaGeochemistryDiatomsOrganic carbonStable isotopes
Type
Articles
Information
Quaternary Research , Volume 84 , Issue 1 , July 2015 , pp. 21 - 36
Copyright
University of Washington

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