The wide gray swath shows total d 14 C uncertainty, including the uncertainty contributed by calendar age error. Observed paleoclimate and detrended d 14 C from the Cariaco Basin and tree rings compared with paleoclimate and cosmogenic isotopes from the GISP2 ice core. Each set of records during deglaciation was measured on the same core and is shown plotted on its own independent time scale, ice-layer chronology for GISP2, and anchored varve chronology for the Cariaco Basin. Be concentrations and snow accumulation measured in the GISP2 ice core. Gray bars indicate climate transitions based on shifts in accumulation rate.
Gray bars indicate climate transitions based on shifts in gray scale and light laminae thickness.
Previous work suggests that abrupt climate shifts in both regions were synchronous. Dashed lines indicate century-scale anomalies common to both cosmogenic 10 Be and 14 C, seen throughout the Holocene and attributed to solar variability.