Electrical conductivity measurements from the GISP2 and GRIP Greenland ice cores
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Electrical conductivity measurements from the GISP2 and GRIP Greenland ice cores. / Dahl-Jensen, Dorthe; Clausen, Henrik Brink; Taylor, K. C.; Hammer, C. U.; Alley, R. B.; Gow, A. J.; Gundestrup, N. S.; Kipfstuh, J.; Moore, J. C.; Waddington, E. D.
In: Nature Geosciences, Vol. 366, 1993, p. 549-552.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Electrical conductivity measurements from the GISP2 and GRIP Greenland ice cores
AU - Dahl-Jensen, Dorthe
AU - Clausen, Henrik Brink
AU - Taylor, K. C.
AU - Hammer, C. U.
AU - Alley, R. B.
AU - Gow, A. J.
AU - Gundestrup, N. S.
AU - Kipfstuh, J.
AU - Moore, J. C.
AU - Waddington, E. D.
PY - 1993
Y1 - 1993
N2 - THE direct-current electrical conductivity of glacial ice depends on its acidity1-3, and can also indicate changes in climate, as ice formed in cold, dusty periods has a high concentration of alkaline dust1,4,5, which significantly reduces the conductivity6,7 compared to warmer, less dusty periods. Here we present electrical conductivity records for the Greenland Ice Sheet Project 2 (GISP2) and Greenland Ice-core Project (GRIP) ice cores, drilled 28 km apart to enable direct comparison of the results. The upper parts of both records are consistent with previous evidence from other Greenland cores4,8& #150;12 for a stable Greenland climate during the Holocene, and a series of warm events punctuating the last glacial period. However, there is a significant discrepancy between the two records in the bottom 10% of the cores, calling into question recent reports of climate variability in the last interglacial4,8 and the penultimate glaciation8. At this stage, it is too early to say what exactly is causing the discrepancy, although ice flow may have introduced some discontinuities into the records. Further work will be necessary to establish how much climatic information it will eventually be possible to extract from the lower parts of the two cores. Udgivelsesdato: 09 december
AB - THE direct-current electrical conductivity of glacial ice depends on its acidity1-3, and can also indicate changes in climate, as ice formed in cold, dusty periods has a high concentration of alkaline dust1,4,5, which significantly reduces the conductivity6,7 compared to warmer, less dusty periods. Here we present electrical conductivity records for the Greenland Ice Sheet Project 2 (GISP2) and Greenland Ice-core Project (GRIP) ice cores, drilled 28 km apart to enable direct comparison of the results. The upper parts of both records are consistent with previous evidence from other Greenland cores4,8& #150;12 for a stable Greenland climate during the Holocene, and a series of warm events punctuating the last glacial period. However, there is a significant discrepancy between the two records in the bottom 10% of the cores, calling into question recent reports of climate variability in the last interglacial4,8 and the penultimate glaciation8. At this stage, it is too early to say what exactly is causing the discrepancy, although ice flow may have introduced some discontinuities into the records. Further work will be necessary to establish how much climatic information it will eventually be possible to extract from the lower parts of the two cores. Udgivelsesdato: 09 december
U2 - 10.1038/366549a0
DO - 10.1038/366549a0
M3 - Journal article
VL - 366
SP - 549
EP - 552
JO - Nature Geoscience
JF - Nature Geoscience
SN - 1752-0894
ER -
ID: 9972710