Marine radiocarbon reservoir effect along the northern Chile–southern Peru coast 14–24°S throughout the HoloceneReportar como inadecuado




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Resumen

Through an extensive sampling and dating of pairs of associated shells and charcoal fragments combinedwith reanalysis of all the available previous data, we reconstruct the evolution throughout the Holocene ofthe regional marine radiocarbon reservoir effect ΔR values along the northern Chile–southern Peru area14°–24°S. After elimination of the cases in which the terrestrial component yielded older ages than themarine shells to which they were associated, the study is based upon data from 47 pairs of associated marineand terrestrial material.Our results suggestmajor changes in both the magnitude and variability range of ΔR during thewhole HolocenePeriod: 1 between 10,400 and 6840 cal yr BP, high values 511±278 yr probably result froma strengthened SEPacific subtropical anticyclone and shoaling of equatorial subsurface waters during intensified upwelling events;2 between 5180 and 1160 cal yr BP, lower values 226±98 yr may reflect a major influence of subtropicalwater and diminished coastal upwelling processes; 3 during the last ~thousand years, high values between355±105 and 253±207 yr indicate an increased influence of 14C-depleted watermasses and of ENSO. For theearly twentieth century a ΔR value of 253±207 yr was calculated.



Autor: Ortlieb, Luc; - Vargas Easton, Víctor; - Saliège, Jean-François; -

Fuente: http://repositorio.uchile.cl/



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