High-time-resolution profiles of soluble ions in the last glacial period of a Dome Fuji (Antarctica) deep ice core

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We measured the depth profiles of soluble ions in the Dome Fuji (Antarctica) ice core to search for possible paleoclimate indications of seasonal climate variations in the last glacial period. A 523mm long core section between 587.65 and 588.18m depth was selected for this pilot study, and the high-resolution chemical analysis was done on 2mm thick samples. Our results indicate that anion-cation trapping in ice affects the profiles of the soluble ions and [Na+] in the core may preserve its seasonal signal. Correlation coefficients and the equivalent balances of the soluble ions suggest the following selective coexistences: (1) [Cl-] = [Na+], (2) [NO3-] = 1/2[Ca2+] + [K+], and (3) [SO4^(2-)] = 1/2[Ca2+] + [H+] + [Mg2+]. These coexistences are probably due to (1) a sea-salt source of Na+ and Cl-, (2) reaction of NO3- with dust for Ca2+ and NO3-, and (3) anion-cation trapping in ice for SO4^[2-] and Ca2+ (Mg2+), respectively.
International Glaciological Societyの論文