Use of δO in dating a Tibetan ice core record of Holocene/Late Glacial climate.

Ice cores from the northwestern Tibetan Plateau (NWTP) contain long records of regional climate variability, but refrozen meltwater and dust in these cores has hampered development of robust timescales. Here, we introduce an approach to dating the ice via the isotopic composition of atmospheric O in air bubbles (δO), along with annual layer counting and radiocarbon dating. We provide a robust chronology for water isotope records (δO and d-excess) from three ice cores from the Guliya ice cap in the NWTP.