Synchronising EDML and NorthGRIP ice cores using δ18O of atmospheric oxygen (δ18Oatm) and CH4 measurements over MIS5 (80-123 kyr)

An ice core air content record that was recovered from the refrozen-recrystallization ice formation zone in the Dasuopu Glacier was investigated in this work, which showed that the air content in ice performed significant fluctuations both in the seasonal and long-time series. The air content was low in summer and high in winter, and fluctuated around the mean value of 5.025 cm3 per 100 g ice from AD 1571 to AD 1927. The correlation of the air content in ice with the climatic and environmental factors was discussed combining with the dating results, which showed that over about 400 yrs from AD 1570 to AD 1927 the air content in ice from the refrozen-recrystallization ice formation zone in the Dasuopu Glacier was mainly dominated by the insolation intensity rather than the temperature and other environmental factors in the Southern Tibetan Plateau. © 2010 Elsevier Ltd and INQUA.