Anthony Watts has an interesting post by Pielke Sr. on warm bias in the surface temperature trend – “provides evidence of the significant error in the global surface temperature trend analyses of NCDC,” at WUWT.
In his WUWT Dr Pielke, Sr Concludes.
Our new paper Klotzbach et al (2009) provides evidence of the significant error in the global surface temperature trend analyses of NCDC, and well of other centers such as GISS and CRU, due to the sampling of temperatures at just one level near the surface. It is also important to recognize that this is just one error of a number that are in the NCDC, GISS and CRU data sets, as we have summarized in our paper.
The whole post can be found here.