Bryan, Sean P; Marchitto, Thomas M (2010): Mg/Ca-temperature proxy in benthic foraminifera from the Florida Strait [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.831060, Supplement to: Bryan, SP; Marchitto, TM (2008): Mg/Ca-temperature proxy in benthic foraminifera: New calibrations from the Florida Straits and a hypothesis regarding Mg/Li. Paleoceanography, 23(2), PA2220, https://doi.org/10.1029/2007PA001553
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Abstract:
Over the past decade, the ratio of Mg to Ca in foraminiferal tests has emerged as a valuable paleotemperature proxy. However, large uncertainties remain in the relationships between benthic foraminiferal Mg/Ca and temperature. Mg/Ca was measured in benthic foraminifera from 31 high-quality multicore tops collected in the Florida Straits, spanning a temperature range of 5.8° to 18.6°C. New calibrations are presented for Uvigerina peregrina, Planulina ariminensis, Planulina foveolata, and Hoeglundina elegans. The Mg/Ca values and temperature sensitivities vary among species, but all species exhibit a positive correlation that decreases in slope at higher temperatures. The decrease in the sensitivity of Mg/Ca to temperature may potentially be explained by Mg/Ca suppression at high carbonate ion concentrations. It is suggested that a carbonate ion influence on Mg/Ca may be adjusted for by dividing Mg/Ca by Li/Ca. The Mg/Li ratio displays stronger correlations to temperature, with up to 90% of variance explained, than Mg/Ca alone. These new calibrations are tested on several Last Glacial Maximum (LGM) samples from the Florida Straits. LGM temperatures reconstructed from Mg/Ca and Mg/Li are generally more scattered than core top measurements and may be contaminated by high-Mg overgrowths. The potential for Mg/Ca and Mg/Li as temperature proxies warrants further testing.
Coverage:
Median Latitude: 24.090931 * Median Longitude: -80.360062 * South-bound Latitude: 23.261800 * West-bound Longitude: -83.377300 * North-bound Latitude: 24.836000 * East-bound Longitude: -79.050000
Date/Time Start: 2002-01-08T00:00:00 * Date/Time End: 2002-01-23T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Bryan, SP; Marchitto, TM (2010): (Table 2) Hydrographical data, and ages of cruise KNR166-2 surface sediment samples. https://doi.org/10.1594/PANGAEA.831048
- Bryan, SP; Marchitto, TM (2010): (Table 3) Benthic foraminiferal Mg/Ca and Li/Ca ratios measured in cruise KNR166-2 surface sediment and LGM samples. https://doi.org/10.1594/PANGAEA.831059