Decomposition of Deglacial Pacific Radiocarbon Age Controls Using an Isotope‐Enabled Ocean Model

During the last deglaciation Earth’s climate experienced strong and abrupt variations, resulting in major changes global temperature, sea level, ocean circulation. Although proxy records have significantly improved our understanding of during this period, questions remain regarding connection between circulation evolution geotracer distributions, including those deep waters Pacific. Here we use C-iTRACE simulation, a transient ocean-only, isotope-enabled version Community Earth System Model, to better understand deglacial Pacific radiocarbon context reservoir age changes. Throughout deglaciation, Ocean responds strongly glacial meltwater forcing, leading large Δ14C age. A multi-millennial weakening overturning from 20 15 ka BP leads increases ages, but 18 BP, nearly half (40%–60%) aging is controlled by changing surface age, corroborating previous studies showing that not solely tracer. As proceeds, change controls progressively more accounting for than 75% it across 8 BP.