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AGU: Paleoceanography

 

Keywords

  • tropical Atlantic variability
  • sea surface temperature

Index Terms

  • Paleoceanography: Sea surface temperature
  • Global Change: Climate variability
  • Global Change: Regional climate change
  • Paleoceanography: Geochemical tracers
  • Paleoceanography: Anthropogenic effects
Abstract
Cited By (10)
 

Abstract

An 8-century tropical Atlantic SST record from the Cariaco Basin: Baseline variability, twentieth-century warming, and Atlantic hurricane frequency

David E. Black

School of Marine and Atmospheric Sciences, State University of New York at Stony Brook, Stony Brook, New York, USA

Matthew A. Abahazi

Department of Geology and Environmental Science, University of Akron, Akron, Ohio, USA

Robert C. Thunell

Department of Geological Sciences, University of South Carolina, Columbia, South Carolina, USA

Alexey Kaplan

Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA

Eric J. Tappa

Department of Geological Sciences, University of South Carolina, Columbia, South Carolina, USA

Larry C. Peterson

Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, Florida, USA

We present the first direct comparison and calibration of a downcore foraminiferal Mg/Ca record to historical instrumental sea surface temperature (SST). Mg/Ca measured on the planktic foraminifer Globigerina bulloides from a Cariaco Basin sediment core strongly correlate with spring (March–May) instrumental SSTs between A.D. 1870 and 1990. A Mg/Ca SST equation is derived and a paleo-SST record is presented spanning the last 8 centuries, an interval that includes the end of the Medieval Warm Period and the Little Ice Age. The long-term record displays a surprising amount of variability. The temperature swings are not necessarily related to local upwelling variability but instead represent wider conditions in the Caribbean and western tropical Atlantic. The Mg/Ca SST record also captures the decadal and multidecadal variability observed in records of global land and sea surface temperature anomalies and Atlantic tropical storm and hurricane frequency over the late nineteenth and twentieth centuries. A divergence between the SST proxy record and Atlantic storm frequency around 1970 appears to reflect a fundamental change in Atlantic hurricane behavior noted in historical data. On average, twentieth-century temperatures are not the warmest in the entire record, but they do show the largest increase in magnitude and fastest rate of SST change over the last 800 a.

Received 29 January 2007; accepted 14 August 2007; published 25 October 2007.

Citation: Black, D. E., M. A. Abahazi, R. C. Thunell, A. Kaplan, E. J. Tappa, and L. C. Peterson (2007), An 8-century tropical Atlantic SST record from the Cariaco Basin: Baseline variability, twentieth-century warming, and Atlantic hurricane frequency, Paleoceanography, 22, PA4204, doi:10.1029/2007PA001427.

Cited By

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