“…In this paper, we construct precise and coherent ice and gas time scales of the DF core over the last 207 kyr (0e2150 m), by iterating between the Paleochrono probabilistic dating model (Parrenin et al, 2021) and the inverse Herron-Langway densification model (Buizert et al, 2021) with various types of constraints, including new dO 2 /N 2 ice age markers, CH 4 gas age markers, and d 15 N for firn properties, obtained by recent precise gas measurement on the DF core (Oyabu et al, 2020(Oyabu et al, , 2021, as well as published tie points between the 10 Be flux record in the second DF core and tree-ring 14 C record (Horiuchi et al, 2008;Miyake et al, 2015Miyake et al, , 2019Kanzawa et al, 2021). Also, a new volcanic matching of the DF to WDC, and indirectly to NGRIP core (Svensson et al, 2020) were made.…”