Humic acid like concentration in seawater samples, collected from the trace metal rosettes in the Southern Ocean during the austral summer of 2016/2017, on board the Antarctic Circumnavigation Expedition. Data file: ace_humics_data.csv File header ace_event_number: Unique number of Trace Metal Rosette deployment during the Antarctic Circumnavigation Expedition date_time [UTC]: date and time of the beginning of the Trace Metal Rosette deployment in the format ISO8601 YYYY-MM-DDThh:mm:ss+00:00 [UTC] latitude [degN]: latitude of the research vessel from which the Trace Metal Rosette deployment took place, at the beginning of the deployment [decimal degrees North] longitude [degE]: longitude of the research vessel from which the Trace Metal Rosette deployment took place, at the beginning of the deployment [decimal degrees East] ace_sample_number: unique number of the seawater sample within the ACE project in the format shipname/ACE/legnumber/projectnumber/julianday[UTC]/eventnumber/PIinitials/projectsamplenumber leg_number: number of the leg of the ACE expedition from which the seawater sample was taken project_sample_number: unique number of the seawater sample within the project that was responsible for taking the samples in the format TMR castnumber BT bottlenumber depth [m]: depth below the surface from which the seawater sample was taken [m] humic_concentration [µg SRFA eq./L]: concentration of humics in seawater sample [µg SRFA eq./L]