The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years

Abstract. A new ice core was drilled in West Antarctica on Skytrain Ice Rise field season 2018/2019. This 651 m is one of the main targets WACSWAIN (WArm Climate Stability Antarctic sheet last INterglacial) project. present-day accumulation rate 13.5 cm w.e. yr−1 derived. Although project mainly aims to investigate interglacial (115–130 ka), a robust chronology period covering recent past needed constrain age models for deepest ice. Additionally, this time important understanding current climatic changes region. Here, we present stratigraphic top 184.14 based absolute tie points interpolated using annual layer counting encompassing 2000 years climate history. Together with model-based depth–age relationship deeper part core, will form ST22 chronology. The chemical composition, dust content, liquid conductivity, water isotope concentration and methane content whole analysed via continuous flow analysis (CFA) at British Survey. Annual performed by manual seasonal variations sodium calcium records. counted informed anchored points, namely, tritium peak (1965 CE) six volcanic eruptions. Methane were used further error. minimal error ±1 year derived, accumulating ± 5 %–10 % unconstrained sections between points. level accuracy enables data interpretation least decadal timescales provides solid base dating ice, which second