Here is an article discussing how NOAA was the outlier when compared to other temperature indexes.
Cheers
Jim
NOAA PROVES AN OUTLIER AGAIN IN MAY
By Joseph D'Aleo, CCM
NOAA proclaimed May 2009 to be the 4th warmest for the globe in 130 years of record keeping. Meanwhile NASA UAH MSU satellite assessment showed it was the 15th coldest May in the 31 years of its record. This divergence is not new and has been growing. Just a year ago, NOAA proclaimed June 2008 to be the 8th warmest for the globe in 129 years of record keeping. Meanwhile NASA satellites showed it was the 9th coldest June in the 30 years of its record
We have noted in the last year that NOAA has often become the warmest of the 5 major data sets in their monthly global anomalies. They were second place until they introduced a new ocean data set to be discussed later.
NOAA and the other ground based data centers would have more credibility if one of the changes resulting in a reduction of the warming trend and not an exaggeration which has been the case each time.
THE MANY ISSUES WITH THE STATION BASED DATA CENTERS
NOAA and the other station base data centers suffer from major station dropout (nearly 3/4ths of the stations) many of them rural, there has been a tenfold increase in missing months in remaining stations, no adjustment for urbanization even as the population grew from 1.5 billion to 6.7 billion since 1900 and documented bad station siting in the United States and almost certainly elsewhere. Also 70% of the earth is ocean and the methods for measurement there over the years have changed from ship buckets to ship intake to satellite surface sensing. Each measures a different level and produces different results. Transitioning was gradual making estimation more challenging.
STATION DROPOUT
NOAA's allowing over 2/3rds of the world's stations to dropout in 1990. You can see the coverage difference between the stations on this GISS analysis of the NOAA gathered stations from 1978 versus that in 2008.
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