It would seem to me that sea based temperature reconstructions would be more accurate because 75 percent of the earth is covered in water, but that is just a guess. (realclimate.org)
Despite the satellite data having much higher error range than land based temperature data. (judithcurry.com)
Whether this increase in instantaneous heat production shows up in near surface land based temperature measuring data sets or not, I don't know. (judithcurry.com)