The Berkeley Earth Surface Temperature (BEST) program supposedly has a "global" combined land and ocean temperature series that is ready but just getting some last minute tweaks and reviews. I have been looking for it to hit the news but I keep getting tired of waiting. GISS land and oceans surface temperature appears to have a baseline/seasonal cycle selection issue that I have been wanting to see how much it might impact trends, especially the "pause".
The difference should not be much, less than the stated error margin, which normally would be no big deal. Since climate change is a political hot potato though it seems every milliKelvin is a battle ground. So I built my own simple "Global" surface temperture record using the full baseline and seasonal cycle for periods where both hemisphere actually had data.
While I am pretty sure that my reconstruction is pretty close, it depends on the current actual land/ocean ratio and mine is pretty old, it would be Best to wait for BEST before screaming that GISS might be off by 0.05 C.