The fact that the land series when restricted to exclude cells with ocean data shows greater warming can be explained by considering coastal stations. (clearclimatecode.org)
This change is inconsistent with the change in surface temperature: 15 coastal stations around Antarctica recorded an average warming of 0.028 degrees annually during 1959 - 88, i.e. three times the global average. (www-das.uwyo.edu)
As mentioned in the previous article, restricting to land de-emphasises coastal stations which generally warm less slowly. (clearclimatecode.org)