A Preliminary Study on Oxygen Isotopes of Ice Cores from Collins Ice Cap, King George Island, Antarctica

Ice-cores of the Collins Ice Cap were all gained through the BZXJ-model
ice-core drilling machine newly made by Lanzhou Institute of Glaciology and
Geocryology, Chinese Academy of Sciences. During drilling and collecting
ice-cores, strict protection measures against the pollution and melt were taken
so that the sample as good as possible to satisfy the demands of physical and
chemical analyses of ice-cores. Collected ice-cores were transported under
frozen conditions from Antarctica to the low temperature laboratory of Polar
Research Institute of China, partly to University of New Hampshire, USA, and
were preserved under -25 degrees centigrade. Ice-cores were taken out before
analyses, cut apart with a band saw on clean low-temperature working table. We
scraped a few millimetres of surface ice to melt under normal air temperature.
Oxygen isotope analyses of 0-13.96m depth ice-cores from Big Dome Summit of
Collins Ice Cap were completed by the Glacier Research Group, Institute for the
Study of Earth, Ocean and Space, University of New Hampshire, USA. Their
sampling interval is 15-20cm, total is 87 samples. Oxygen isotope analyses of
13.96-20.02m depth and 27.78-30.52m depth ice-cores from Big Dome Summit of
Collins Ice Cap and firn samples drawn from BDA, BDB, BDC and Small Dome Top
(SDT) were completed in state key laboratory of mineralization in Nanjing
University. Sampling interval (total of 10 samples) is between 30cm and 130cm,
and the sampling interval of SDT (total of 20 samples) is 10-20cm.