Global ocean warming started later in the 20th century than previously estimated

In estimations of ocean heat content -- important when assessing and predicting the effects of climate change -- calculations have often presented the rate of warming as a gradual rise from the mid-20th century to today. However, new research could overturn that assumption, suggesting the ocean maintained a relatively steady temperature throughout most of the 20th century, before embarking on a steep rise. The newly discovered dynamics may have significant implications for what we might expect in the future.

source https://www.sciencedaily.com/releases/2021/08/210809162742.htm