This is the first study that vertical mixing could already be suppressed in the oceans by stratification: "Changes in Oceanic Radiocarbon and CFCs Since the 1990s"; agupubs.onlinelibrary.wiley.com/doi/10.1029/... - good thing: via vertical mixing across density layers only about 20% of OHU happens

Changes in Oceanic Radiocarbon and CFCs Since the 1990s

Recent trends in upper ocean Δ14C, pCFC-11, and pCFC-12 are negative, reflecting their decreasing atmospheric trends Increases in ∆14C are only observed in a few places over 2000–2010s, showing o...