Newall Glacier and Dome C Ice Core in situ 14C Data
Entry ID: NOAA_NCDC_PALEO_2003-065

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Summary
Abstract: We have studied the levels of 14C in firn and ice from two regions accumulating
ice in Antarctica, Dome C, and Newall Glacier. The observed concentrations
indicate variable amounts of in-situ 14C from cosmic-ray spallation of oxygen.
14C appears to be produced as both CO and CO2 in variable amounts, but our
results suggest rapid conversion of 14CO to 14CO2. Much of the in-situ 14C is
retained which results in a significant modification of the 14C/12C in ice
derived from trapping of air at and below the firn-ice transition zone. This
means that direct dating of accumulating ice cannot be used without correction
for the in-situ 14C. In Newall ice, we see some evidence for an enhancement in
in-situ 14C at or near the time of the Maunder Minimum. Results for Dome C
firn and ice indicate higher levels of in-situ 14C in older ice. This is due
either to a reduced accumulation rate in the past, or possible variations in
cosmogenic 14C production. The levels of in-situ 14C in firn and ice, and its
impact on 14C dates on trapped CO2 in ice are discussed.

Related URL
Link: GET DATA
Description: Access to 14C data and documentation from Newall Glacier and Dome C


Link: GET DATA
Description: Access to EPICA Dome C data sets


Geographic Coverage
 N: -75.0 S: -75.0  E: 123.35  W: 123.35
 Min Depth: 194 M  Max Depth: 556 M
 N: -77.5 S: -77.5  E: 162.62  W: 162.62
 Min Depth: 5 M  Max Depth: 61 M

Data Set Citation
Dataset Originator/Creator: Jull, A.J.T., D. Lal, D.J. Donahue, P. Mayewski, C. Lorius, D. Raynaud and J.R. Petit
Dataset Title: Newall Glacier and Dome C Ice Core in situ 14C Data
Dataset Series Name: IGBP PAGES/WDC CONTRIBUTION SERIES NUMBER: 2003-065
Dataset Release Date: September 2003
Dataset Release Place: Boulder, CO
Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification: 2003-065
Other Citation Details: NOAA/NCDC Paleoclimatology Program
Online Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/newall/ne...


Paleo_Temporal_Coverage
Paleo Start Date: 18,000 ybp
Paleo Stop Date: 4000 ybp
Chrono Unit:

Paleo Start Date: 2000 ybp
Paleo Stop Date: 0 ybp
Chrono Unit:


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR


Science Keywords
PALEOCLIMATE >ICE CORE RECORDS >CARBON DIOXIDE    [Definition]
PALEOCLIMATE >ICE CORE RECORDS >ISOTOPES    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION


Project
PAGES >Past Global Changes, IGBP    [Information]


Keywords
14C
Newall Glacier
Dome C
cosmogenic 14C


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: online ftp
Distribution_Format: text
Fees: none


Personnel
A. J.T. JULL
Role: INVESTIGATOR


DEVENDRA LAL
Role: INVESTIGATOR
Email: dlal at ucsd.edu
Contact Address:
Scripps Institution of Oceanography
University of California, San Diego
City: La Jolla
Province or State: CA
Postal Code: 92093
Country: US


D. J. DONAHUE
Role: INVESTIGATOR


PAUL A. MAYEWSKI
Role: INVESTIGATOR
Phone: 207-581-2190
Phone: 207-581-3019
Fax: 207-581-1203
Email: paul.mayewski at maine.edu
Email: climatechange at maine.edu
Email: usitase at maine.edu
Contact Address:
Climate Change Institute
Department of Earth Sciences
University of Maine
303 Bryand Global Science Building
City: Orono
Province or State: ME
Postal Code: 04469-5790
Country: United States


CLAUDE LORIUS
Role: INVESTIGATOR
Contact Address:
Laboratoire de Glaciologie et de
Geophysique de l'Environnement
CNRS-CEA 91198
Gif-su-Yvette Cedex
Country: France


DOMINIQUE RAYNAUD
Role: INVESTIGATOR
Phone: 76-42-58-72
Contact Address:
Laboratoire de Glaciologie et
Geophysique de l''Environnement
54 Rue Molieres
City: St. Martin d'Heres Cedex
Postal Code: 38402
Country: FRANCE


J. R. PETIT
Role: INVESTIGATOR
Contact Address:
Laboratoire de Glaciologie et de
Geophysique de l'Environnement
Gif-su-Yvette Cedex
CNRS-CEA
Postal Code: 91198
Country: FRANCE


Publications/References
Jull, A.J.T., D. Lal, D.J. Donahue, P. Mayewski, C. Lorius, D. Raynaud and
J.R. Petit, 1994, Measurements of cosmic-ray-produced 14C in firn and ice from
antarctica, Nuclear Instruments and Methods in Physics Research Section B:
Beam Interactions with Materials and Atoms, Volume 92, Issues 1-4, 3 June
1994, Pages 326-330. doi:10.1016/0168-583X(94)96028-3

Creation and Review Dates
DIF Creation Date: 2004-11-10
Last DIF Revision Date: 2004-11-10

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