More than 90 percent of the warming that has happened on Earth over the past 50 years has occurred in the ocean. Not all of that heating is detectable yet at the surface
Recent hemispheric asymmetry in global ocean warming induced by climate change and internal variability
Climate Change Indicators: Sea Surface Temperature
Climate Corner, January 2020 (U.S. National Park Service)
Marine heatwaves - Climate Change & Nature: New Zealand
Recent acceleration in global ocean heat accumulation by mode and intermediate waters
Is The Earth Heating Up? Ask The Oceans - Asian Scientist Magazine
Southern Ocean takes on the heat of climate change
Climate Change in the Gulf of Maine - Maine Island Kayak Co
Quantification of ocean heat uptake from changes in atmospheric O2 and CO2 composition
Ocean Facts, The World Oceans and Continents
Global Ocean Heat Content trend map from Reanalysis & Multi-Observations Reprocessing
Earth's Big Heat Bucket