[ACC37-P09] Variation trend of 17O-excess in an Arctic ice core
Keywords:ice core, Arctic region, 17O-excess
With the improvment of water isotope analyzers, the ability to measure δ17O in water with high precision provided another second−order parameter, the 17O−excess, defined as 17O−excess = ln (δ17O+1) − 0.528 ∗ ln(δ18O+1). Previous studies reported that 17O−excess in polar snow is mainly controlled by the relative humidity in the water vapor source region, therefore expected as a new proxy of past climate change. However, at the present, there are few studies of 17O−excess in ice core, and therefore an undrestanding of variation factor of that is incomplete.
In this study, we analyzed δ17O and 17O−excess in an ice core which was drilled in Alaska. We also discussed the variation factors of those associated with environmental change.