Table 1 Correlations of detrended, mean annual (March to Feburary) reconstructed SST (IF comp = Ifaty/Tulear coral composite SST) with instrumental SST at Ifaty (IF) and for the Agulhas Current (AC) core region. Had1 = HadSST1³², Had3 = HadSST3³³, ERSST³⁴. All correlations significant above the 1% level, despite IF comp with IF Had3 (5%). Correlations computed for maximum number of years in each dataset taking into account the degrees of freedom for each correlation pair. Ifaty HadSST3 suffers from sparse observation pre-1920, while AC HadSST3 is complete to 1850. Correlations computed at http://climexp.knmi.nl/⁴²

From: Madagascar corals track sea surface temperature variability in the Agulhas Current core region over the past 334 years