The application of foraminifera to reconstruct the rate of 20th century sea level rise, Morbihan Golfe, Brittany, France

Veronica Rossi, Benjamin P. Horton, D. Reide Corbett, Eduardo Leorri, Lucia Perez-Belmonte, Bruce C. Douglas

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Foraminiferal assemblages preserved within salt-marsh sediment can provide an accurate and precise means to reconstruct relative sea level due to a strong relationship with elevation, which can be quantified using a transfer function. We collected a set of surface samples from two salt marshes in the Morbihan Golfe, France to determine foraminiferal distribution patterns. Dominant taxa included Jadammina macrescens, Trochammina inflata, Haplophragmoides spp. and Miliammina fusca. We developed a foraminifera-based transfer function using a modern training set of 36 samples and 23 species. The strong relationship between observed and predicted values (r2jack=0.7) indicated that foraminiferal distribution is primarily controlled by elevation with respect to the tidal frame and precise reconstructions of former sea level are possible (RMSEPjack=0.07m). The application of the transfer function to a short salt-marsh core (0.32m) allowed the reconstruction of former sea levels, which were placed in a chronological framework using short-lived radionuclides (210Pb and 137Cs). The agreement between the foraminifera-based sea level curve and the Brest tide-gauge record confirms the reliability of transfer function estimates and the validity of this methodology to extend sea level reconstructions back into the pre-instrumental period. Both instrumental and microfossil records suggest an acceleration of sea level rise during the 20th century.

Original languageEnglish (US)
Pages (from-to)24-35
Number of pages12
JournalQuaternary Research
Volume75
Issue number1
DOIs
StatePublished - Jan 2011
Externally publishedYes

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Earth-Surface Processes
  • Earth and Planetary Sciences(all)

Keywords

  • Foraminifera
  • Salt marshes
  • Sea level
  • Transfer function

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