10.1594/PANGAEA.996195Mittermayer-Schmittmann, FelixFelixMittermayer-SchmittmannGEOMAR - Helmholtz Centre for Ocean Research KielFinke, JuliaJuliaFinkeGEOMAR - Helmholtz Centre for Ocean Research KielLehmann, AndreasAndreasLehmann0000-0001-5618-6105GEOMAR - Helmholtz Centre for Ocean Research KielPANGAEA2026Baltic SeaCTD castsRV ALKORTimeseriesEvent labelStation labelDATE/TIMELATITUDELONGITUDESample elevationDate/Time localPressure, waterTemperature, waterSalinityConductivityDensity, sigma-theta (0)OxygenOxygen saturationSound velocity in waterCTD/RosetteCTDAL610Alkor (1990)2024-04-04T09:20:37/2024-04-15T04:00:34Dataset10.3289/CR_AL61051568 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalConductivity-temperature-depth profiles were measured using a Sea&Sun CTM2049 CTD during RV ALKOR cruise AL610. The CTD was equipped with duplicate sensors for temperature, conductivity and oxygen. The oxygen sensor (galvanic oxygen micro-sensor (AMT)) was exchanged in the beginning of the year. All other sensors were calibrated in March 2024. The sensors are used throughout the year and no post-cruise calibration is applied. Data were connected to the station book of the specific cruise as available in the DSHIP database.
This dataset presents conductivity–temperature–depth (CTD) profiles collected during the research cruise. The data were processed using a custom Python workflow designed to summarize, standardize, and prepare CTD measurements for publication. Raw sensor output files (.TOB format) were parsed using a dedicated reader that extracts header metadata and harmonizes variable naming conventions across all profiles.
Quality control procedures included the removal of non-physical values, treatment of missing or malformed entries, and consistency checks across key variables such as pressure, temperature, conductivity, and derived parameters (e.g., salinity and oxygen). Oxygen values were scaled, and salinity values were corrected according to the respective CTD calibration. Sensor channels were standardized and renamed to ensure compatibility with common data standards. Geographic coordinates were converted from degrees and minutes to decimal degrees to improve geospatial usability. Pressure was linearly interpolated to a uniform 1 dbar grid, and all depth-dependent parameters were interpolated accordingly. Maximum recorded pressure was cross-checked against local bathymetry (elevation); in cases of mismatch, profiles were truncated at the maximum depth of the corresponding location.
The workflow further includes visual quality control of oxygen saturation, station locations, and vertical profiles of temperature, salinity, and oxygen.10.0213366716.5003366754.14010555.79264833