Climate signal in varve thickness: Lake La Cruz (Spain), a case study |
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| Authors: | Lidia Romero-Viana Ramon Julià Antonio Camacho Eduardo Vicente Maria Rosa Miracle |
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| Institution: | (1) Department of Microbiology and Ecology and Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, 46100, Burjassot, Valencia, Spain;(2) Institut Ciències de la Terra “Jaume Almera”, CSIC, C/Lluis Solé i Sabarís, s/n, 08028 Barcelona, Spain |
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| Abstract: | Lake La Cruz is a meromictic, karstic lake with annually laminated sediment formed by summer pulses of calcite deposition.
The aim of this study was to explore the potential use of the laminated sediment from Lake La Cruz as a quantitative climate
proxy, by calibrating lamina thickness against instrumental climate data. Statistical analysis of the relation between lamina
thickness and the meteorological dataset indicated a high correlation between calcium carbonate lamina thickness and rainfall
from December to March (r = 0.725, P < 0.01, n = 35). Winter rainfall anomalies in the area are, in turn, highly negatively correlated with the North Atlantic Oscillation
index (NAO, r = −0.832; P < 0.01; n = 53). We propose a regression model to infer past winter rainfall from calcium carbonate laminae thickness. These results
highlight new possibilities for paleoenvironmental research using calcite laminated sediment records as climate proxies, especially
to study past rainfall variability. |
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| Keywords: | Calcite Laminated sediment North Atlantic Oscillation (NAO) Lake La Cruz Varves Paleoclimatic reconstruction |
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