On Pierre Gosselin's NoTricksZone, Kenneth Richard reports a new paper by Frederick Pontius
Sustainable Infrastructure: Climate Changes and Carbon Dioxide (link)
Climate Changes and Carbon Dioxide
Temperatures Record ‘Unreliable’, ‘Arbitrarily Adjusted’, And Of ‘Poor Data Quality’
Temperature measurement stations have been installed at various locations across the globe. The number of temperature monitoring stations is decreasing and many areas across the globe do not have any temperature monitoring stations. Consequently, average surface temperature is an unreliable metric for assessing global temperature trends.
Computer models are used to analyze data sets. In science and engineering (and this paper) the term “data” refers to actual physical measurement at a point in time and space. In some temperature data sets, however, computer simulated values have been added in or data may have been arbitrarily adjusted long after the physical measurement was taken. Such practices undermine the credibility of the data set. Computer generated values are estimates, projections, or simulations and are of a different quality than physical measurements. Physical measurements represent a physical quantity whereas computer simulations represent numerical calculation.
The HADCRU, GISTEMP, and NOAA surface temperature archives rely on the same underlying input data and therefore are not independent data sets. Limitations of the GHCN affect all data sets. Sampling discontinuities, urbanization and land use changes have decreased the quality of GHCN data over time. Differences in data processing methods between research teams do not compensate for poor underlying data quality inherent in the GHCN data. A similar situation exists with historical Sea Surface Temperature (SST) data sets which are derived primarily from the International Comprehensive Ocean-Atmosphere Data Set (ICODADS).