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An 8-century tropical Atlantic SST record from the Cariaco Basin: Baseline variability, twentieth-century warming, and Atlantic hurricane frequency
School of Marine and Atmospheric Sciences, State University of New York at Stony Brook, Stony Brook, New York, USA
Department of Geology and Environmental Science, University of Akron, Akron, Ohio, USA
Department of Geological Sciences, University of South Carolina, Columbia, South Carolina, USA
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA
Department of Geological Sciences, University of South Carolina, Columbia, South Carolina, USA
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: (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.
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