Not exact matches
The
long - term NOAA
record of tropospheric humidity from
radiosondes and satellites shows that water vapor content (specific humidity) has decreased with warming.
Within the community that constructs and actively analyses satellite - and
radiosonde - based temperature
records there is agreement that the uncertainties about
long - term change are substantial.
The satellite
records have the advantage of global coverage, whereas the
radiosonde record is
longer.
Prior to 1988, the satellite data that Trenberth uses is not available, but it is known that
long term
records in
radiosondes contain large inhomogeneities due to improving observing systems, increasing spatial resolution (but still very little ocean coverage), and the NCEP data in particular contains large model biases.