Table 1 Linear regression equation and correlation coefficient between annual mean and monthly coral Sr/Ca and NOAA OISSTv2 centered at Enggano Island (5°S, 102°E) for the time period 1982–2008 and the mean equation from17 for comparison.

From: Coral Sr/Ca records provide realistic representation of eastern Indian Ocean cooling during extreme positive Indian Ocean Dipole events

Coral core

Regression equation

r (r2)

p

σ

n

[Sr/Ca = slope(± standard error) x SST + intercept(± standard error)]

Annual

PB

Sr/Ca = − 0.061(± 0.01) × SST + 10.607(± 0.30)

0.76 (0.58)

  0.01

0.014

26

KN2

Sr/Ca = − 0.075(± 0.01) × SST + 11.077(± 0.37)

0.76(0.58)

  0.01

0.024

26

Enggano

Sr/Ca = − 0.068(± 0.01) × SST + 10.821(± 0.28)

0.81(0.66)

 0.01

0.015

26

Monthly

PB

Sr/Ca = − 0.045(± 0.002) × SST + 10.119(± 0.07)

− 0.71(0.50)

 0.01

0.038

322

KN2

Sr/Ca = − 0.054(± 0.003) x SST + 10.257(± 0.09)

− 0.71(0.50)

 0.01

0.046

322

Enggano

Sr/Ca = − 0.047(± 0.003) × SST + 10.208(± 0.08)

− 0.67(0.45)

 0.01

0.035

322

Mean Equation (Corrège, 2006)

Sr/Ca = − 0.0607 × SST + 10.553

  1. r(r2) is the correlation coefficient, p is the p-value and σ is the standard deviation of the regression.