Cruise Report, RV ATAIR, Cruise 067I033-1, Bremerhaven – Thybor?n – Aberdeen, 23 Jul – 15 Aug 2024 13 end of each CTD cast. A supplementary temperature sensor was installed at the height of the Niskin bottles about 1 m above the CTD unit in order to record water temperature at the time of the bottle closing. All temperature and conductivity sensors were successfully recalibrated in the BSH’s calibration laboratory prior to the cruise. In-situ temperatures are reported on the ITS-90 scale. Derived salinities refer to the Practical Salinity Scale of 1978 (PSS-78). All re- spective densities have been inferred from the EOS-80 equation. The CTD system worked well during the whole cruise, and all sensors showed reliable meas- urements. The differences between redundant sensors were small and mostly within uncer- tainty range as given by the manufacturer and later calibration. Larger differences were ob- served under rough measurement circumstances or due to large numbers of particles within the water column clogging the sensor packs for short times. Position Bottle ID Manufacturer Volume Nominal Closing Depth 1 S-ID181001 General Oceanics 10 L bottom 3 S-ID181013 “ “ “ bottom 5 S-ID181005 “ “ “ Chl-a max 7 S-ID181006 “ “ “ Chl-a max 9 Go-Flo 179 General Oceanics “ 10 m S-ID181014 General Oceanics “ 10 m 11 S-ID181003 “ “ “ 5 m S-ID181014 “ “ “ 10 m Go-Flo 179 General Oceanics “ 10 m 13 S-ID181004 General Oceanics “ 5 m S-ID181003 “ “ “ 5 m 15 S-ID181004 “ “ “ 5 m Table 5.2. Overview on the Niskin bottle set-up and sampling scheme of cruise 067I033-1. Changes in the bottle set-up and thus changes to the bottle positions on the water sampler were made beginning with stations #002, #022 and #023. All Niskin bottles were checked at the beginning of the cruise and then closed during the upcast at the designated sampling levels. Before closing, a 3 min waiting time was applied to avoid