Geochemical Ocean Section Study (GEOSECS) Atlantic, Pacific, Indian, and Mediterranean Radiocarbon Data, CDIAC NDP-027Entry ID: CDIAC_NDP27
Abstract: This package contains radiocarbon data from the Atlantic, Pacific, and Indian
Oceans obtained during the Geochemical Ocean Section Study (GEOSECS). GEOSECS,
initiated in 1971 and coordinated by Scripps Institution of Oceanography, was
designed to establish a baseline data base for assessing future chemical
changes in the world's oceans and to provide a better understanding ... of
large-scale oceanic transport and mixing processes. During the GEOSECS
expeditions, over 2,200 water samples were collected. Samples for carbon-14
were collected at 124 stations, and approximately 18 samples were collected at
each station from intervals throughout the water column.
The sampling technique and measurement procedure used in the
radiocarbon determinations is described in Stuiver et al. (1974). On
board the ship, the samples for radiocarbon were water drawn from
270-liter Gerard barrels, and CO2 was extracted following a method
derived from Fonselius and Ostlund (1959). The CO2 samples were
absorbed in excess NaOH, deposited in well-sealed bottles and sent to
laboratories for processing. Delta 14C values are recalculated to a
standardized state of isotopic fractionation equivalent to standard
wood (del 13C = -25 permil) and are related to activities at the time
All the radiocarbon, hydrographic, and position data presented in this package
have been provided by the Oceanographic Data Facility at Scripps. Data included
in this package include the following: position (degrees and minutes), sample
number, depth (in meters calculated from density and pressure), potential
temperature, salinity, and delta 14C determinations from the University of
Miami and the University of Washington.
The GEOSECS radiocarbon data were used to establish the gross rate of
deep-ocean circulation. Stuiver et al. (1983) summarized these data and
concluded that replacement times of the waters below 1,500 meters in the
Atlantic, Indian, and Pacific Oceans are, respectively, about 275, 250, and 510
years. These radiocarbon data also reflect the general trend of deep
circulation from the Atlantic to the other oceans and are of value in
establishing parameters in multidimensional ocean models.
All CDIAC numerical data packages include copies of pertinent literature
discussing the data, summaries discussing the background, source and scope of
the data, as well as applications limitations and restrictions of the data.
More information is available from:
Data Set Citation
Dataset Originator/Creator: Ostlund, H.G.
Dataset Title: GEOSECS Atlantic, Pacific, Indian, and Mediterranean Radiocarbon Data
Dataset Series Name: NDP-027
Dataset Release Date: 1988
Dataset Release Place: Oak Ridge, TN
Dataset Publisher: Carbon Dioxide Information Analysis CenterOnline Resource: http://cdiac.esd.ornl.gov/oceans/ndp027.html
Start Date: 1972-01-01Stop Date: 1978-01-01
Distribution Media: on-line (FTP)
Distribution Size: 50.4 KB
Phone: (305) 361-4719
Tritium Laboratory Rosenstiel School of Marine and Atmospheric Sciences University of Miami
Province or State: Florida
Postal Code: 33149
Role: TECHNICAL CONTACT
Phone: (206) 685-1735
Email: minze at u.washington.edu
Quaternary Isotope Laboratory University of Washington Department of Geological Sciences
Province or State: WA
Postal Code: 98195-1310
Fonselius, S., and H.G. Ostlund, 1959: 'Natural radiocarbon measurements
on surface water from the North Atlantic and the Arctic Sea.' Tellus,
Stuiver, M., S.W. Robinson, H.G. Ostlund, and H.G. Dorsey, 1974: 'Carbon-14
calibration between the University of Washington and the University of
Miami GEOSECS laboratories.' Earth and Planetary ... Science Letters,
Stuiver, M., and H.G. Ostlund, 1980: 'GEOSECS Atlantic radiocarbon.'
Ostlund, H.G., and M. Stuiver, 1980: 'GEOSECS Pacific radiocarbon.'
Stuiver, M., and H.G. Ostlund, 1983: 'GEOSECS Indian Ocean and Mediterranean
radiocarbon.' Radiocarbon, 25:1-29.
Stuiver, M., P.D. Quay, and H.G. Ostlund, 1983: 'Abyssal water carbon-14
distribution and the age of the world oceans.' Science, 219:849-851.
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Creation and Review Dates
Last DIF Revision Date: 2009-01-21