noaa-icecore-13565
Law Dome, Antarctica High Resolution 1999-2009 10Be Data, Revised Dating
Pedro, J.B.; Heikkilä, U.; Klekociuk, A.; Smith, A.M.; van Ommen, T.D.; Curran, M.A.J.
Law Dome, Antarctica High Resolution 1999-2009 10Be Data, Revised Dating
2012-11-07
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/13565
Investigator
J.B.
Pedro
Investigator
U.
Heikkilä
Investigator
A.
Klekociuk
Investigator
A.M.
Smith
Investigator
T.D.
van Ommen
Investigator
M.A.J.
Curran
earth science
paleoclimate
ice cores
ice age,null,null,year Common Era,null,ice cores,null,null,N,null
earth science
paleoclimate
ice cores
delta 18O,bulk ice,null,per mil VSMOW,null,ice cores,null,null,N,null
earth science
paleoclimate
ice cores
10Be,bulk ice,null,null,null,ice cores,null,null,N,atom per milligram
earth science
paleoclimate
ice cores
10Be,bulk ice,one standard error,null,null,ice cores,null,null,N,atom per milligram
earth science
paleoclimate
ice core
radiogenic isotopes
geoscientificInformation
1999 AD
2009 AD
-49 cal yr BP
-59 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
Pedro, J.B., U.E. Heikkila, A. Klekociuk, A.M. Smith, T.D. van Ommen, and M.A.J. Curran. 2011.
Beryllium-10 transport to Antarctica: Results from seasonally resolved observations and modeling.
Journal of Geophysical Research (Atmospheres), Vol. 116, D23120.
DOI: 10.1029/2011JD016530
Cosmogenic 10Be measured in polar ice cores has important application in the reconstruction of past solar activity. However, the processes controlling its atmospheric transport and deposition to the ice sheets are not fully understood. Here we use the seasonal changes in 10Be concentrations in a 10 year monthly resolved ice core record from the Law Dome site (East Antarctica) in conjunction with ECHAM5-HAM general circulation model (GCM) simulations of 10Be and 7Be deposition as tools to examine this problem. Maximum 10Be concentrations are observed in the ice core during the austral late summer to early autumn (summer-autumn), while minimum concentrations are observed during the austral winter. The GCM simulations, corroborated by earlier observations of 10Be:7Be ratios in Antarctica from the Georg von Neumayer air sampling station, suggest that the 10Be concentration maximum is linked to direct input of stratospheric 10Be from the Antarctic stratosphere to the lower levels of the Antarctic troposphere during the austral summer-autumn. This result contrasts with the modeled transport of 10Be to Greenland, where the seasonal maximum in stratospheric input is seen in the late winter to spring, synchronous with the timing of the seasonal maximum in midlatitude stratosphere to troposphere exchange. Our results suggest that a different combination of processes is responsible for the transport of 10Be to the Antarctic and Greenland ice sheets.
STUDY NOTES: Revised dating from Pedro et al., J. Geophys. Res., 2011. Reference for the original data: Pedro et al., Climate of the Past 7:707
This record comprises composite 10Be concentrations from three Law Dome ice cores (DSS0506-core, DSS0809-core and DSS0910-core).
Sample dating is revised from that presented in Pedro et al., 7, 707-721, 2011 by accounting for sub-seasonal variability in
snow accumulation. The accumulation record was derived from the European Center for Medium-Range Weather Forecasts Interim
Reanalysis (ERA-Interim). See Appendix 1 of Pedro et al., J. Geophys. Res. 116, D23120, 2011 for details of method.
Note: All measurements are calibrated to the NIST SRM 4325 10Be standard reference material, utilising the Nishiizumi et al. (2007) 10Be:9Be ratio of (2.79 +/- 0.02) x 10^(-11)
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law2011-10be-composite-revised.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11