Fig. 8From: Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical PacificResults of multi-taper method spectral analyses of the SMJ-2-S1 sclerosponge δ18O (A) and instrumental SST (ERSST v3b) (B) for 1880–2012. The 90%, 95%, and 99% confidence levels are shown as red lines. Numbers denote interannual to decadal periodicity with significant peaks at the confidence levelBack to article page