It turned out that the original hydrographic data product of the BNSC (v1.0,
Hinrichs and Gouretski 2018) was erroneous. The errors occurred by accidentally reading obsolete files in two of the intermediate steps of the production procedure. By this, the basis of observations was altered. This happened after the quality control and interpolation of the observations on standard depths, in the step where the observations are sorted into the chosen grid (this affects temperature and salinity) and in the following step, the correction of the temporal sampling error (this affects only salinity).
This document illustrates and quantifies the differences between BNSChydr v1.0 and v1.1.