Among these groups are Remote Sensing Systems (RSS) and the University of Alabama in Huntsville (UAH).
Particularly large differences between reconstructed temperature series occur at the few times when there is little temporal overlap between successive satellites, making intercalibration difficult.
[7][8] For comparison, a different group, Remote Sensing Systems (RSS), also analyzes the MSU data.
In a 1998 paper, Wentz and Schabel showed this (along with other discrepancies) was due to the orbital decay of the NOAA satellites.
[12] With these errors corrected, the UAH data showed a 0.07 °C/decade increase in lower troposphere temperature.
[9][10] A more detailed discussion can be found in the Comparison with surface trends section of the Microwave Sounding Unit temperature measurements article.
NOAA-11 played a significant role in a 2005 study by Mears et al. identifying an error in the diurnal correction that leads to the 40% jump in Spencer and Christy's trend from version 5.1 to 5.2.
[16] Christy et al. asserted in a 2007 paper that the tropical temperature trends from radiosondes matches more closely with their v5.2 UAH-TLT dataset than with RSS v2.1.