Not exact matches
Although there is no possibility of a calibration standard for global temperature, the MSU (i.e. RSS and UAH)
measurements are almost global in coverage and the
radiosondes provide independent
measurements for comparison.
Temperature
measurements retrieved from the hundreds of balloon - borne
radiosonde instruments that are released each day by the various national weather services
provide much more detailed information on the vertical structure of atmospheric temperature changes than is available from satellites.
The
radiosondes would
provide a check for accuracy / drift of the satellite
measurements over time and to
provide a solid overlap when calibrating a new satellite or instrument..