Separation of melting and environmental signals in an ice core with seasonal melt
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Separation of melting and environmental signals in an ice core with seasonal melt. / Moore, J C; Grinsted, Aslak; Kekonen, T; Pohjola, V.
In: Geophysical Research Letters, Vol. 32, No. L10501, 2005.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Separation of melting and environmental signals in an ice core with seasonal melt
AU - Moore, J C
AU - Grinsted, Aslak
AU - Kekonen, T
AU - Pohjola, V
N1 - Paper id:: 10.1029/2005GL023039
PY - 2005
Y1 - 2005
N2 - We examine the impact of melt water percolation on the soluble ion chemical record from the Lomonosovfonna ice core. Principle component analysis shows that melting produces only simple changes between bubbly and clear ice facies, due to elution of ions. The data can be naturally split into four groups: pre-industrial, immediately before, and after the end of the Little Ice Age, and anthropogenic impact eras. The 2nd, 3rd and 4th principle components for these periods all differ significantly, reflecting complex changes in environmental conditions. Thus the core preserves a rich record of environmental history, and simple one of melting. We construct a model of percolation effects to reconstruct “pristine” ice chemical composition, finding that even with melt percentages as high as 80%, there is little disturbance to the chemical stratigraphy. This suggests that ionic records from Arctic ice cap cores are nearly as reliable as those from Greenland or Antarctica.
AB - We examine the impact of melt water percolation on the soluble ion chemical record from the Lomonosovfonna ice core. Principle component analysis shows that melting produces only simple changes between bubbly and clear ice facies, due to elution of ions. The data can be naturally split into four groups: pre-industrial, immediately before, and after the end of the Little Ice Age, and anthropogenic impact eras. The 2nd, 3rd and 4th principle components for these periods all differ significantly, reflecting complex changes in environmental conditions. Thus the core preserves a rich record of environmental history, and simple one of melting. We construct a model of percolation effects to reconstruct “pristine” ice chemical composition, finding that even with melt percentages as high as 80%, there is little disturbance to the chemical stratigraphy. This suggests that ionic records from Arctic ice cap cores are nearly as reliable as those from Greenland or Antarctica.
M3 - Journal article
VL - 32
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - L10501
ER -
ID: 9832578