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Globorotalia truncatulinoides (R) Mg/Ca Water Temperature Calibration
Entry ID: NOAA_NCDC_PALEO_2004-018

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Summary
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.

Abstract
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. [1969], 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.

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Geographic Coverage
 N: 12.05 S: -39.72  E: 82.25  W: 63.15
 Min Depth: 1929 M  Max Depth: 4268 M
 N: 63.0 S: 63.0  E: 29.74  W: 29.74

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 Program
Online Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/mck...


Location Keywords
OCEAN > INDIAN OCEAN
OCEAN > ARCTIC OCEAN > BARENTS SEA


Science Keywords
OCEANS >OCEAN TEMPERATURE >THERMOCLINE    [Definition]
OCEANS >OCEAN TEMPERATURE >WATER TEMPERATURE    [Definition]
PALEOCLIMATE >OCEAN/LAKE RECORDS >ISOTOPES    [Definition]
PALEOCLIMATE >OCEAN/LAKE RECORDS >MICROFOSSILS    [Definition]
PALEOCLIMATE >OCEAN/LAKE RECORDS >SEDIMENTS    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION


Project
PAGES >Past Global Changes, IGBP    [Information]


Keywords
Sediment
Water Temperature
thermocline
Mg/Ca
marine temperature gradients
plankton tow


Data Set Progress
COMPLETE


Originating Center
NOAA/NCDC


Data Center
World Data Center for Paleoclimatology, Boulder    [Information]
Data Center URL: http://www.ncdc.noaa.gov/paleo/

Data Center Personnel
Name: WDC/PALEOCLIMATOLOGY, BOULDER
Phone: +1 (303) 497-6160
Fax: +1 (303) 497-6513
Email: paleo at noaa.gov
Contact Address:
World Data Center for Paleoclimatology
NOAA/NCDC Code E/GCx3
325 Broadway
City: Boulder
Province or State: CO
Postal Code: 80303
Country: USA



Distribution
Distribution_Media: ftp
Distribution_Format: text, excel
Fees: none


Personnel
VICKI S. MCKENNA
Role: INVESTIGATOR


WARREN L. PRELL
Role: INVESTIGATOR
Contact Address:
Brown University
City: Providence
Province or State: RI
Postal Code: 02912
Country: USA


Publications/References
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: 2016-01-27

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