Globorotalia truncatulinoides (R) Mg/Ca Water Temperature CalibrationEntry ID: NOAA_NCDC_PALEO_2004-018
Abstract: This data set consists of Globorotalia truncatulinoides (R) Mg/Ca to water
temperature calibrations from Indian Ocean core-top sediments and plankton
tows. G. truncatulinoides (R) is a deep dwelling species that provides a Mg
thermometer for the extremes of the permanent thermocline.
Recent work has provided useful Mg/Ca to water temperature calibrations for
shallow-dwelling ... planktonic foraminifer species. Globorotalia
truncatulinoides (right coiling (R)) is a deep-dwelling species that can serve
as a source of information about the temporal variability in the water
characteristics of the thermocline. We present a temperature calibration for
the Mg/Ca in the shell of G. truncatulinoides (R) and examine some of the
practical issues associated with evaluating the usefulness of the technique.
The Mg/Ca in the primary and the secondary calcite of individual G.
truncatulinoides (R) correlates exponentially with water column temperatures,
showing a change of ~10% in the Mg/Ca per 1°C (R2 = 0.92). A limited
comparison with plankton tow samples demonstrates that the average Mg/Ca
temperature was offset +1°C from the average temperature calculated using the
D18O calibration of O'Neil et al. , and the Mg/Ca temperatures have a
range similar to the d18O temperatures. Comparisons of the [Mg] in the core
top samples to water depth of deposition indicates that dissolution does not
alter the measured value of Mg in the primary calcite.
Data Set Citation
Dataset Originator/Creator: McKenna, V. S., and W. L. Prell
Dataset Title: Globorotalia truncatulinoides (R) Mg/Ca Water Temperature Calibration
Dataset Series Name: IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2004-018
Dataset Release Date: 4/2004
Dataset Release Place: Boulder, CO
Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification: 2004-018
Other Citation Details: NOAA/NCDC Paleoclimatology ProgramOnline Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/mck...
ISO Topic Category
Data Set Progress
Distribution Media: ftp
Distribution Format: text, excel
McKenna, V. S., and W. L. Prell. 2004. Calibration of the Mg/Ca of Globorotalia
truncatulinoides (R) for the reconstruction of marine temperature gradients.
Paleoceanography, 19, PA2006, doi:10.1029/2000PA000604.
Creation and Review Dates
DIF Creation Date: 2006-12-13
Last DIF Revision Date: 2007-02-15