In each panel,closed circle with horizontal and vertical bars denotes the mean deviations from 30-year climatologies(1942-71)and their standard deviations.Standard deviations mean the variabilities during the comparison period.Here it is natural that in Fig.2(c),mean deviations of CSST and SST are both zero by the definition of anomalies.On the other hand,mean deviation of uncorrected SST anomalies is -0.72℃ in the period of 1912-1941,while that of corrected SST anomalies is -0.37℃ and that of CSST is also -0.37℃.That is,the difference of 0.35℃ between uncorrected and corrected SSTS comes from the correction by Folland and Parker(1995),and due to the correction,30-year mean deviation of corrected SST in the period of 1912-1942 becomes the same as that of CSST.That is,we can say that the correction proposed by Folland and Parker functions very well at least to SST data surrounding Ishigakijima CSST station(Station i).

Fig.3.　Summary of comparison at 9 CSST stations.(a)Correlation coefficients between CSST and SST.Closed circles denote those between uncorrected SST and CSST in the period of 1912-1941.Closed triangles denote those between corrected SST and CSST in the period of 1912-1941.Closed stars denote those between SST and CSST in the period of 1942-1971.(b)Mean deviations(averaged anomalies)in the period of 1912-1941.Closed circles denote those of uncorrected SST in the period of 1912-1941.Closed triangles denote those of corrected SST in the period of 1912-1941.Closed stars denote those of CSST in the period of 1912-1941.

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