“…In particular, the coral skeletal strontium to calcium ratios (Sr/Ca) can reveal changes in sea surface temperature (SST) on monthly to interannual time scales through the growth of their skeletons (Jiang, Yu, Tao, et al., 2021; Smith et al., 1979; Yu, Zhao, Wei, Cheng, Chen, et al., 2005). Coral Sr/Ca records with precise dating have been used to extend the instrumental and historical records of ENSO variability into the past (Cobb et al., 2013; Hereid et al., 2013; Mohtar et al., 2021).…”