Corroborated Rainfall Records from Aragonitic Stalagmites

Adrian Anthony Finch, PA Shaw, K Holmgren, J Lee-Thorp

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Sr and Ba levels of two proximal aragonite speleothems from Cold Air Cave, South Africa, are examined at pm resolution. A compositional map derived from parallel secondary ion mass spectrometry linescans indicates heterogeneity perpendicular to the stalagmite growth axis, precluding the use of single linescans as a climatic proxy technique. A similar to40-yr averaged trace element record for the cave produced from multiple parallel linescans on both stalagmites is compared with regional and local climatic (rainfall, temperature) data for 1955-1996. This period includes two extensive drought episodes. There is poor correlation between trace elements and annual mean temperature. Droughts correspond to minima in trace element ratios and peaks correspond to annual maxima in rainfall. The onset and termination of droughts are notable inflexions. However, in detail annual rainfall magnitude does not correlate directly with trace element ratios, indicating that kinetic factors, notably variations in speleothem growth rate, play a key role in trace element uptake by aragonite. Averaged long data sets constrained by chronological control have potential in the study of sub-decadal precipitation patterns. (C) 2003 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)265-273
Number of pages9
JournalEarth and Planetary Science Letters
Volume215
Issue number1-2
DOIs
Publication statusPublished - 15 Oct 2003

Keywords

  • South Africa
  • Cold Air Cave
  • speleothem
  • SIMS
  • ion probe
  • palaeoenvironments
  • SOUTH-AFRICA
  • SPELEOTHEM
  • RECONSTRUCTION
  • RESOLUTION
  • HOLOCENE

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