Many floats that show a low standard deviation ratio display
a significant difference between the AAIW salinity minimum
observed at the floats and the AAIW salinity minimum
along the float track derived from WOA. At first sight this
could suggest a calibration problem. This may occasionally
be the case for individual floats but is less likely for entire
float neighbourhoods that show the same difference. Such a
situation is more likely an indicator for interannual changes
in the AAIW salinity field, which are further discussed in