A tale of two seas: Reservoir age correction values (R, ΔR) for the Sakhalin Island (Sea of Japan and Okhotsk Sea)

Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation

“…Radiocarbon ages are given according to the convention outlined by Stuiver and Polach (1977) and Stuiver (1980) and summarized in Table 2. We applied reservoir age correction of +900 yr (Max et al, 2012) for core SO178-13-6, which is determined by a marine global average reservoir age correction of +400 yr (Reimer et al, 2013) and a local planktic reservoir age correction ( R) of +500 yr reported for the Okhotsk Sea environment (Kuzmin et al, 2001(Kuzmin et al, , 2007. There is increasing evidence that surface reservoir ages could have varied over the course of the last 20 kyr, due to global thermohaline reorganizations as well as changes in upper-ocean stratification.…”

Early Holocene M~6 explosive eruption from Plosky volcanic massif (Kamchatka) and its tephra as a link between terrestrial and marine paleoenvironmental records

“…Estimates of the reservoir age for the western Bering Sea are lacking, so, in order to calibrate marine radiocarbon ages, researchers have to use ΔR = 698 ± 50 14 C years obtained ~2,000 km southwest, at Sakhalin Island in the Okhotsk Sea (Kuzmin et al 2007), or a value from two known age shells of Mytilus edulis from ~1,550 km northeast at Port Clarence, Alaska, which yield a mean ΔR and standard deviation of 497 ± 83 14 C years (McNeely et al 2006).…”

Comparison of Large and Ultra-Small Δ14C Measurements in Core Top Benthic Foraminifera from the Okhotsk Sea

“…The top of BC32 has a conventional 14 C age on N. pachyderma of 430 ± 35 BP and a date near the bottom (41.5 cm) is 2230 ± 30 BP (Table 1). Because ΔR in Okhotsk Sea surface waters is 578 ± 50 yr (Kuzmin et al 2007), the core top age is about 550 14 C yr younger than the expected pre-bomb age and probably reflects the presence of bomb-produced 14 C. The calibrated age at 41.5 cm is about 1200 BP, so the rate of sedimentation assuming zero age at the top is 33 cm/kyr, about three times higher than Nesmeyanov core 15. In addition to the planktonic 14 C and δ 18 O results, the core top Cibicidoides δ 13 C and δ 18 O (Keigwin 1998) also indicate that BC32 has an unusually good record of the past 1000 yr, right up to today.…”