noaa-icecore-9959
Law Dome Ice Core 2000-Year CO2, CH4, and N2O Data
MacFarling Meure, C.; Etheridge, D.M.; Trudinger, C.; Steele, P.; Langenfelds, R.L.; van Ommen, T.D.; Smith, A.M.; Elkins, J.
Law Dome Ice Core 2000-Year CO2, CH4, and N2O Data
2010-07-16
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9959
Investigator
C.
MacFarling Meure
Investigator
D.M.
Etheridge
Investigator
C.
Trudinger
Investigator
P.
Steele
Investigator
R.L.
Langenfelds
Investigator
T.D.
van Ommen
Investigator
A.M.
Smith
Investigator
J.
Elkins
earth science
paleoclimate
ice cores
notes,null,null,null,null,ice cores,null,null,C,null
earth science
paleoclimate
climate forcing|ice cores
methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,corrected|smoothed,null,N,NOAA 04 scale?
earth science
paleoclimate
climate forcing|ice cores
nitrous oxide,bulk atmosphere,null,parts per quadrillion,null,climate forcing|ice cores,corrected|smoothed,null,N,null
earth science
paleoclimate
climate forcing|ice cores
methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,corrected|smoothed,null,N,null
earth science
paleoclimate
climate forcing|ice cores
carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,corrected|smoothed,null,N,null
earth science
paleoclimate
ice cores
gas age,null,null,year Common Era,null,ice cores,null,null,N,null
earth science
paleoclimate
ice core
atmospheric gas
geoscientificInformation
carbon cycle
1 AD
2004 AD
1949 cal yr BP
-54 cal yr BP
Complete
-66.73
-66.73
112.83
112.83
1390
1390
Continent
Antarctica
Law Dome>LATITUDE -66.73>LONGITUDE 112.83
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
MacFarling Meure, C., D. Etheridge, C. Trudinger, P. Steele,
R. Langenfelds, T. van Ommen, A. Smith, and J. Elkins. 2006.
The Law Dome CO2, CH4 and N2O Ice Core Records Extended to 2000 years BP.
Geophysical Research Letters, Vol. 33, No. 14, L14810 10.1029/2006GL026152.
New measurements of atmospheric greenhouse gas concentrations in ice
from Law Dome, Antarctica reproduce published Law Dome CO2 and CH4
records, extend them back to 2000 years BP, and include N2O.
They have very high air age resolution, data density and measurement
precision. Firn air measurements span the past 65 years and overlap
with the ice core and direct atmospheric observations. Major increases
in CO2, CH4 and N2O concentrations during the past 200 years followed
a period of relative stability beforehand. Decadal variations during
the industrial period include the stabilization of CO2 and slowing
of CH4 and N2O growth in the 1940s and 1950s. Variations of up to
10 ppm CO2, 40 ppb CH4 and 10 ppb N2O occurred throughout the
preindustrial period. Methane concentrations grew by 100 ppb
from AD 0 to 1800, possibly due to early anthropogenic emissions.
STUDY NOTES: Law Dome ice core (DSS, DE08 and DE08-2), firn air (DSSW20K),
and Cape Grim instrumental (deseasonalised archive, insitu and flask)
records of CO2, CH4 and N2O concentrations for the past 2000 years.
Law Dome location: The dome summit is as follows,
individual cores are within about 25 km (see publications)
66°44'S, 112°50'E, 1390m elevation.
Measurement precision for the ice core air samples is 4.1 ppb CH4,
1.1 ppm CO2, and 6.5 ppb N2O. Measurement precision for the firn air
samples is 2 ppb CH4, 0.1 ppm CO2 and 0.3 ppb N2O.
Ice core concentrations are adjusted for small system enhancements
(1.1 ± 0.8 ppm for CO2, 4.1 ± 4.0 ppb for CH4, and 1.8 ± 0.9 ppb for N2O)
as described in MacFarling Meure et al. (2006) and for the effects of
gravitational fractionation, also small, as described in Etheridge et al.
1996, 1998.
Air age spread is 10-12 years for DE08/-2 ice samples,
18-20 years for DSS ice samples and 5 years for DSSW20K firn air samples.
See Trudinger et al., 2002 for statistical definitions.
DE08 and DE08-2 ice core air dating uncertainty is less than +/- 3 years.
DSS ice core air dating uncertainty is less than +/- 5 years.
DSS ice dating has been revised based on new accumulation rates and
temperatures (van Ommen, T., V. Morgan and M.A.J. Curran. 2004.
Deglacial and Holocene changes in accumulation at Law Dome, East Antarctica,
Annals Glaciol., 39, 359-365.; MacFarling Meure 2004).
The dating of published DSS concentrations have been adjusted by less than
5 years under the new chronology.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law2006.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law2006.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-18
2018-12-18