Signal variability in replicate ice cores
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Signal variability in replicate ice cores. / Wolff, Eric W.; Cook, Eliza; Barnes, Piers R.F.; Mulvaney, Robert.
I: Journal of Glaciology, Bind 51, Nr. 174, 2005, s. 462-468.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Signal variability in replicate ice cores
AU - Wolff, Eric W.
AU - Cook, Eliza
AU - Barnes, Piers R.F.
AU - Mulvaney, Robert
PY - 2005
Y1 - 2005
N2 - Replicate ice cores have been drilled about 10 m apart for the top 790 m of the ice sheet at Dome C, Antarctica. This provides an opportunity to examine inter-core variation of the signal for identical events, based on dielectric profile (DEP) comparisons. Comparison of the signal from the same core (a section 48 m long), measured 1 year apart, showed good reproducibility, with peak heights varying by around 10% between the two measurements. For the two replicate cores, identical peaks were matched and showed variability between cores of typically a factor 1.5. This can be explained based on the likelihood of significant time periods of missing accumulation in any single core at sites with such low snow accumulation rate. To synchronize core depths by matching peaks, it is essential to use the pattern of peaks, rather than just widely spaced individual strong peaks. To derive a quantitative volcanic index from these low-accumulation rate sites, it will be necessary to combine or average the results from several closely spaced parallel cores.
AB - Replicate ice cores have been drilled about 10 m apart for the top 790 m of the ice sheet at Dome C, Antarctica. This provides an opportunity to examine inter-core variation of the signal for identical events, based on dielectric profile (DEP) comparisons. Comparison of the signal from the same core (a section 48 m long), measured 1 year apart, showed good reproducibility, with peak heights varying by around 10% between the two measurements. For the two replicate cores, identical peaks were matched and showed variability between cores of typically a factor 1.5. This can be explained based on the likelihood of significant time periods of missing accumulation in any single core at sites with such low snow accumulation rate. To synchronize core depths by matching peaks, it is essential to use the pattern of peaks, rather than just widely spaced individual strong peaks. To derive a quantitative volcanic index from these low-accumulation rate sites, it will be necessary to combine or average the results from several closely spaced parallel cores.
U2 - 10.3189/172756505781829197
DO - 10.3189/172756505781829197
M3 - Journal article
VL - 51
SP - 462
EP - 468
JO - Journal of Glaciology
JF - Journal of Glaciology
SN - 0022-1430
IS - 174
ER -
ID: 192784088