Comparison of two ice-core chemical records recovered from the Qomolangma
A 40.9 m ice core was recovered from Far East Rongbuk Glacier (FER), Qomolangma (Mount Everest), Himalaya, and an 80.4 m core from neighboring East Rongbuk Glacier (ER). Both are dated by seasonal variations of 18O and major-ionic profiles, together with references of -activity peaks. In this paper we compare the chemical records of these two cores to show post-depositional modification processes. The smoothed 18O profiles of the two cores show a similar trend. However, the mean 18O value of the FER core for the period 1954-96 is 3.12 less than that of the corresponding part of the ER core, and the major-ionic profiles of the two cores differ considerably. We suggest that melting-away of the snow layer deposited during the pre-monsoon season may account for lower 18O values of the FER than of the ER core, and higher terrestrial ion concentrations in the FER core for the period 1957-63 may contribute to changes by chemical reactions in the presence of snowmelting. The significantly decreased NH4+ and, to a lesser degree, SO42- concentrations in the FER core could be caused by the ion elution process that moved most chemicals away with runoff.
Annals of Glaciology
International Glaciological Society
Digital Object Identifier (DOI)
H. Shugui et al., "Comparison of two ice-core chemical records recovered from the Qomolangma (mount Everest) region, Himalaya," Annals of Glaciology, vol. 35, no. 1, pp. 266–272, Jan. 2002.