Dierking, Jan; Mittermayer-Schmittmann, Felix; Finke, Julia; Lehmann, Andreas (2026): Physical oceanography during ALKOR cruise AL592 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.996193
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Published: 2026-08-18 • DOI registered: 2026-09-16
Abstract:
Conductivity-temperature-depth profiles were measured using a ADM-CTD SN MOCNET during RV ALKOR cruise AL592. 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. The sensors are used throughout the year and no post-cruise calibration is applied. All other sensors of the CTD are calibrated irregularly. 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
Related to:
Dierking, Jan (2024): Long-term monitoring of biodiversity changes and their functional consequences in the pelagic ecosystems of the central Baltic Sea: Cruise No. AL592. Alkor-Berichte, GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany, Al592, 26 pp, https://doi.org/10.3289/CR_AL592
Coverage:
Median Latitude: 55.076394 * Median Longitude: 14.575281 * South-bound Latitude: 54.140200 * West-bound Longitude: 10.020753 * North-bound Latitude: 55.792878 * East-bound Longitude: 16.505263
Date/Time Start: 2023-04-15T14:21:52 * Date/Time End: 2023-04-26T08:31:42
Minimum Elevation: -95.0 m * Maximum Elevation: -12.0 m
Event(s):
AL592_2-1 * Latitude: 54.688480 * Longitude: 10.405790 * Date/Time: 2023-04-15T14:19:47 * Elevation: -32.0 m * O2A Registry URI: https://registry.o2a-data.de/items/13723 * Campaign: AL592 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
AL592_4-1 * Latitude: 54.706360 * Longitude: 10.146280 * Date/Time: 2023-04-16T06:02:35 * Elevation: -25.0 m * O2A Registry URI: https://registry.o2a-data.de/items/13723 * Campaign: AL592 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
AL592_5-2 * Latitude: 54.630080 * Longitude: 10.155300 * Date/Time: 2023-04-16T06:45:01 * Elevation: -22.0 m * O2A Registry URI: https://registry.o2a-data.de/items/13723 * Campaign: AL592 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Dierking, Jan | |||
| 2 | Station label | Station | Dierking, Jan | |||
| 3 | DATE/TIME | Date/Time | Dierking, Jan | Geocode | ||
| 4 | LATITUDE | Latitude | Dierking, Jan | Geocode | ||
| 5 | LONGITUDE | Longitude | Dierking, Jan | Geocode | ||
| 6 | Sample elevation | Elevation | m | Dierking, Jan | ||
| 7 | Date/Time local | Date/Time local | Dierking, Jan | |||
| 8 | Pressure, water | Press | dbar | Dierking, Jan | CTD | |
| 9 | Temperature, water | Temp | °C | Dierking, Jan | CTD | |
| 10 | Salinity | Sal | Dierking, Jan | CTD | ||
| 11 | Conductivity | Cond | mS/cm | Dierking, Jan | CTD | |
| 12 | Oxygen | O2 | µmol/l | Dierking, Jan | CTD | |
| 13 | Oxygen saturation | O2 sat | % | Dierking, Jan | CTD |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
37908 data points
Download Data
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