The study does not show a rise in ocean temp so much as it attempts to model the variation of ocean temperature in order to pick out the forcings. (climateaudit.org)
This means studying the sun to understand its cycles and atmosphere and even deeper ocean temp measurements. (judithcurry.com)
(B) We have been measuring ocean temps from 0 to 700 meters with some accuracy for some time. (judithcurry.com)