There is a tendency around to claim that satellite Lower Troposphere (LT) T trends now agree with Jones et al (land & sea) and GISS land based trends.
But this is not so.
Trend differences of circa 0.047 C per decade are huge when viewed against the claims by Jones et al / IPCC of only 0.05 C UHI contamination over the century plus surface record. For graphic and details.
The trends for the graphic below for the 27 year period Dec 1978 through Nov 2005 are 0.12516 per decade for MSU and 0.17256 per decade for Jones. A difference of 0.0474 degrees C per decade which when pro-rated suggests circa 0.4 degrees C per century. A figure that is far from insignificant when considered alongside the IPCC / Jones et al claim that their data only includes only 0.05 degrees UHI contamination over the course of the record. The GISS trend is 0.185 per decade.
In addition to the above both Jones /CRU and GISS late in 2005 made news with claims raising the possibility that 2005 could be the warmest year yet, topping 1998.
However with both groups now quoting data through November 2005 claims have been wound back slightly.
On the CRU front page under News, they say;
WMO/CRU/Met. Office press release on Global Temperature for 2005: second warmest year on record.
That means warmer than 2002 but not topping 1998.
GISS are a little more confident and their homepage states;
The global surface temperature for the 2005 meteorological year is probably the hottest on record. Although 2005 tied 1998 within the margin of error, the 2005 mark is particularly noteworthy because no El Niño contributed to this year’s heating. (Dec. ’05)
Dr John Christy at University of Alabama at Huntsville (UAH) quoting the the MSU data finds less warming than GISS or CRU and says 2005 has been the equal second warmest year in the 27 year satellite record, equal with 2002 and clearly cooler than 1998.
We will present more trend comparisons as data come to hand.