Comparisons between pyrheliometers for intercalibration are carried out regularly to measure the amount of solar energy received.

Particularly large differences between reconstructed temperature series occur at the few times when there is little temporal overlap between successive satellites, making intercalibration difficult.

At the same time two U.S.-led cruises (2008 and 2009) provided samples for intercalibration to laboratories from many countries.

Another satellite temperature analysis is provided by NOAA/NESDIS STAR Center for Satellite Application and Research and use simultaneous nadir overpasses (SNO) to remove satellite intercalibration biases yielding more accurate temperature trends.