Revised ΔR values for the Barents Sea and its archipelagos as a pre-requisite for accurate and robust marine-based 14C chronologies

The calibration of marine 14C dates requires the incorporation regionally specific reservoir offsets known as ΔR, essential for accurate and meaningful inter-archive comparisons. Revised, regional ΔR (‘ΔRR’) values Barents Sea are presented molluscs cetaceans two latest iterations curve, based on previously published pre-bomb live-collected radiocarbon-dated samples (‘ΔRL’; molluscs: n = 16; cetaceans: 18). Molluscan ΔRR, determined four broad oceanographic settings, are: western Svalbard (including Bjørnøya), −61 ± 37 yrs (Marine20), 94 38 (Marine13); Franz Josef Land, −277 57 −122 Novaya Zemlya, −156 73 0 76 northern Norway, −86 39 74 24 (Marine13). ΔRR considered applicable to other carbonate materials (e.g., foraminifera, ostracods). Cetacean toothed (n 10) baleen 8) whales, a combined toothed-baleen group 18): toothed, −161 41 1 baleen, −158 43 8 baleen-toothed −160 4 49 Where identification separation whales is impossible term may be used. However, we explicitly discourage application existing cetacean terms mammals. Our new long those conditions (circulation ventilation) have persisted, i.e., through Holocene. We recommend using iteration Marine20, which seems better capture time-variant nature R compared Marine13. More ΔRL datapoints both would improve accuracy precision ΔRR. In meantime, our facilitate across region, paving way late Quaternary histories inter-regional