Cruise Report, RV ATAIR, Cruise 067I033-1, Bremerhaven – Thybor?n – Aberdeen, 23 Jul – 15 Aug 2024 17 In summary, any post-cruise correction of the data was not applied, and the temperature, con- ductivity and salinity data were made available with flag 1 (good data). The usage of the data from the secondary sensor pair (TC2) is recommended. Sampling and titration of oxygen samples was not performed during cruise 067I033-1 to the North Sea, but was carried out on the subsequent cruise 067I033-2 to the German Bight. The same oxygen sensor was used on both cruises. The comparison between CTD oxygen and oxygen obtained from titrated water samples of cruise 067I033-2 unfortunately revealed a mal- function of the CTD oxygen sensor. Consequently, any correction of the sensor-derived oxy- gen data was not possible, and sensor-derived oxygen data from both cruises were made available with flag 4 (bad data). Any quality control of fluorescence and turbidity data was not performed. Thus, the respective data were made available with flag 0 (no quality control applied). Salinity Difference AUTOSAL-CTD All samples All samples with differences < +/- 1 standard deviation All samples with differences < +/- 1 standard deviation for the 2nd mean AUTOSAL - TSC1 Number of data pairs 183 175 150 percentage 96% 82% Mean difference -0.0074 -0.0008 -0.0007 Median difference -0.0012 -0.0011 -0.0010 Standard deviation 0.0466 0.0059 0.0021 AUTOSAL – TSC2 Number of data pairs 183 175 111 percentage 96% 83% Mean difference -0.0064 -0.0007 -0.0005 Median difference -0.00008 -0.00004 -0.00008 Standard deviation 0.0460 0.0065 0.0020 Table 5.3. Results of the comparison between bottle salinity samples obtained from salinometer meas- urements (AUTOSAL) and conductivity/salinity recordings at the time of closing the Niskin bottles, the latter obtained from the two CTD sensor packs (TSC1 and TSC2).