Fig. 3

South Pacific coral δ¹³C and skeletal extension rate: coral annual skeletal extensions rates (in blue) and annual average skeletal δ¹³C (black open dots) and δ¹³C data with the average atmospheric ¹³C Suess effect removed (solid black dots) in Porites lutea corals from: a Fiji core AB⁵³, b Fiji core 1F⁵², c Tonga core TNI2⁵⁴, d Rarotonga core 2R^51,52, and e American Samoa core Ta’u-1^55,56. Extension rate and δ¹³C significantly correlate to varying degrees (see R values in Table 1) up until the mid-20th century when coral δ¹³C abruptly shifts ~1.0‰ lower at all of these sites. The very low growth year in 2000 in Tonga core TNI2 is a confirmed bleaching event when growth was truncated to 7 mm in that year. Also note that Fiji cores 1F and AB were collected from Porites lutea colonies in Savusavu Bay at the same water depth approximately 100 m from each other. Source data are provided as a Source Data file in the Supplement