noaa-icecore-9973
GISP2 Ice Core 1000 Year Ar-N2 Isotope Temperature Reconstruction
Kobashi, T.; Severinghaus, J.; Barnola, J.M.; Kawamura, K.; Carter, T.; Nakaegawa, T.
GISP2 Ice Core 1000 Year Ar-N2 Isotope Temperature Reconstruction
2010-06-28
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9973
Investigator
T.
Kobashi
Investigator
J.
Severinghaus
Investigator
J.M.
Barnola
Investigator
K.
Kawamura
Investigator
T.
Carter
Investigator
T.
Nakaegawa
earth science
paleoclimate
ice cores
delta 40Ar,bulk atmosphere,one standard deviation,per mil AIR,null,ice cores,null,null,N,null
earth science
paleoclimate
climate reconstructions|ice cores
surface temperature,delta 15N excess,null,degree Celsius,null,climate reconstructions|ice cores,null,null,N,null
earth science
paleoclimate
ice cores
delta 15N,bulk atmosphere,null,per mil AIR,null,ice cores,null,null,N,null
earth science
paleoclimate
ice cores
delta 40Ar,bulk atmosphere,null,per mil AIR,null,ice cores,null,null,N,null
earth science
paleoclimate
ice cores
number of samples,null,null,count,null,ice cores,null,null,N,null
earth science
paleoclimate
climate reconstructions|ice cores
surface temperature,delta 15N excess,one standard deviation,degree Celsius,null,climate reconstructions|ice cores,null,null,N,null
earth science
paleoclimate
climate reconstructions|ice cores
surface temperature,delta 15N excess,null,degree Celsius,null,climate reconstructions|ice cores,smoothed,null,N,null
earth science
paleoclimate
ice cores
delta 15N,bulk atmosphere,one standard deviation,per mil AIR,null,ice cores,null,null,N,null
earth science
paleoclimate
ice cores
air content,bulk ice,null,unspecified unit,null,ice cores,null,null,N,null
earth science
paleoclimate
climate reconstructions|ice cores
age,null,null,year Common Era,null,climate reconstructions|ice cores,null,null,N,null
earth science
paleoclimate
climate reconstructions|ice cores
depth,null,null,meter,null,climate reconstructions|ice cores,null,null,N,null
earth science
paleoclimate
ice cores
delta Ar/N2,bulk atmosphere,null,per mil AIR,null,ice cores,null,null,N,null
earth science
paleoclimate
ice cores
delta Ar/N2,bulk atmosphere,one standard deviation,per mil AIR,null,ice cores,null,null,N,null
earth science
paleoclimate
ice core
nitrogen isotopes
earth science
paleoclimate
ice core
reconstruction
geoscientificInformation
Air Temperature Reconstruction
Arctic
decadal resolution
960 AD
1950 AD
990 cal yr BP
0 cal yr BP
Complete
72.6
72.6
-38.5
-38.5
3200
3200
Continent
North America
Greenland
GISP2>LATITUDE 72.6>LONGITUDE -38.5
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
Kobashi, T., J.P. Severinghaus, J.-M. Barnola, K. Kawamura,
T. Carter, and T. Nakaegawa. 2010.
Persistent multi-decadal Greenland temperature fluctuation
through the last millennium.
Climatic Change, Vol. 100, pp. 733-756.
DOI 10.1007/s10584-009-9689-9
Future Greenland temperature evolution will affect melting
of the ice sheet and associated global sea-level change.
Therefore, understanding Greenland temperature variability
and its relation to global trends is critical. Here, we
reconstruct the last 1,000 years of central Greenland surface
temperature from isotopes of N2 and Ar in air bubbles in an
ice core. This technique provides constraints on decadal
to centennial temperature fluctuations. We found that northern
hemisphere temperature and Greenland temperature changed
synchronously at periods of ~20 years and 40-100 years.
This quasi-periodic multi-decadal temperature fluctuation
persisted throughout the last millennium, and is likely
to continue into the future.
STUDY NOTES: Nitrogen and Argon isotope data from air bubbles in the GISP2
ice core, and 1000 year temperature reconstruction based on
the gas isotope data. Nitrogen (15N/14N) and argon (40Ar/36Ar)
isotopic ratios were measured, and a firn air separation model
was used to reconstruct decadally averaged surface temperature.
The thickness of the firn layer and the temperature gradient
between the top and bottom of the firn layer causes known amounts
of isotopic separation by gravitational and thermal fractionation,
respectively (Severinghaus et al. 1998). Measurements of two
isotopic ratios with differing sensitivity (d15N and d40Ar) allow
separation of the two effects, providing the past firn thickness
and temperature gradient DT (Kobashi et al. 2007, 2008a, b;
Severinghaus and Brook 1999). Surface temperature can be calculated
from the DT and accumulation rate data (Kobashi et al. 2008a),
combined with a firn-densification/heat diffusion model.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/isotopes/gisp2-ar-n2-temperature2010.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/isotopes/gisp2-ar-n2-temperature2010.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11