This datasets presents age and stable water isotopes per depth increment for core UN-1 (2009-2021), University Ice Cap, Severnaya Zemlya, Russian Arctic. The stable oxygen (δ18O) and hydrogen (δD) isotope composition of all core samples were determined at the ISOLAB facility of AWI in Potsdam (Germany). A Picarro L2130i cavity ringdown spectrometer (CRDS) was used for all ice-core and snow pit samples with an analytical precision of ±0.08‰ for δ18O and ±0.5‰ for δD. The stable water isotope composition was reported in per mil (‰) versus Vienna Standard Mean Ocean Water (VSMOW2). The second order parameter deuterium excess (d xs) was calculated as d xs = δD – 8 * δ18O.