A mid-twentieth century reduction in tropical upwelling inferred from coralline trace element proxies

Matthew K. Reuer, Edward A. Boyle, Julia Cole

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The Cariaco Basin is an important archive of past climate variability given its response to inter- and extratropical climate forcing and the accumulation of annually laminated sediments within an anoxic water column. This study presents high-resolution surface coral trace element records (Montastrea annularis and Siderastrea siderea) from Isla Tortuga, Venezuela, located within the upwelling center of this region. A two-fold reduction in Cd/Ca ratios (3.5-1.7 nmol/mol) is observed from 1946 to 1952 with no concurrent shift in Ba/Ca ratios. This reduction agrees with the hydrographic distribution of dissolved cadmium and barium and their expected response to upwelling. Significant anthropogenic variability is also observed from Pb/Ca analysis, observing three lead maxima since 1920. Kinetic control of trace element ratios is inferred from an interspecies comparison of Cd/Ca and Ba/Ca ratios (consistent with the Sr/Ca kinetic artifact), but these artifacts are smaller than the environmental signal and do not explain the Cd/Ca transition. The trace element records agree with historical climate data and differ from sedimentary faunal abundance records, suggesting a linear response to North Atlantic extratropical forcing cannot account for the observed historical variability in this region.

Original languageEnglish (US)
Pages (from-to)437-452
Number of pages16
JournalEarth and Planetary Science Letters
Volume210
Issue number3-4
DOIs
StatePublished - May 30 2003

Fingerprint

Trace Elements
upwelling water
trace elements
twentieth century
climate
upwelling
trace element
artifact
artifacts
Venezuela
kinetics
Kinetics
climate forcing
barium
Barium
Cadmium
cadmium
coral
Sediments
sediments

Keywords

  • Barium
  • Cadmium
  • Cariaco Basin
  • Coral reefs
  • Paleoclimatology
  • Trace elements

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

A mid-twentieth century reduction in tropical upwelling inferred from coralline trace element proxies. / Reuer, Matthew K.; Boyle, Edward A.; Cole, Julia.

In: Earth and Planetary Science Letters, Vol. 210, No. 3-4, 30.05.2003, p. 437-452.

Research output: Contribution to journalArticle

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