Here, from Hadley Centre, are the global sea surface
temperatures from 1850 to 2006. Please see:

http://members.cox.net/rcoppock/HadSST2gl.jpg

As predicted by Arrhenius over a century ago,
the rate of sea warming is slower than global land
warming. NASA GISS has global land surface
warming at .58K/per century between 1880 and
2006. (Please see:
http://data.giss.nasa.gov/gistemp/tabledata/GLB.Ts.txt)

These data come from:
http://www.cru.uea.ac.uk/cru/data/temperature/

There are no urban centers in the sea, but watch
the fossil fools blame this on UHI anyway.