Mittermayer-Schmittmann, Felix; Finke, Julia; Lehmann, Andreas: Physical oceanography during ALKOR cruise AL601 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995294 (dataset in review)
Abstract:
Conductivity-temperature-depth profiles were measured using a ADM-CTD SN MOCNET during RV ALKOR cruise AL601. 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. 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.
Related to:
Mittermayer-Schmittmann, Felix (2025): Multidisciplinary Teaching Cruise MNF-bioc-301: Plankton Along the Baltic Sea Salinity Gradient. Cruise No. AL601, 29 August – 9 September 2023, Kiel (Germany) – Kiel (Germany). https://doi.org/10.3289/CR_AL601
Coverage:
Median Latitude: 55.367339 * Median Longitude: 15.734371 * South-bound Latitude: 54.399190 * West-bound Longitude: 10.033400 * North-bound Latitude: 57.366420 * East-bound Longitude: 19.583400
Date/Time Start: 2023-08-30T08:12:20 * Date/Time End: 2023-09-09T05:30:06
Minimum DEPTH, water: 1.0 m * Maximum DEPTH, water: 117.8 m
Event(s):
AL601_1-1 * Latitude: 54.692720 * Longitude: 10.155610 * Date/Time: 2023-08-30T08:10:26 * Elevation: -32.0 m * O2A Registry URI: https://registry.o2a-data.de/items/13723 * Campaign: AL601 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
AL601_2-2 * Latitude: 54.691360 * Longitude: 10.394570 * Date/Time: 2023-08-30T13:29:56 * Elevation: -30.0 m * O2A Registry URI: https://registry.o2a-data.de/items/13723 * Campaign: AL601 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
AL601_3-1 * Latitude: 54.683070 * Longitude: 10.498500 * Date/Time: 2023-08-30T13:56:13 * Elevation: -27.0 m * O2A Registry URI: https://registry.o2a-data.de/items/13723 * Campaign: AL601 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Mittermayer-Schmittmann, Felix | |||
| 2 | Station label | Station | Mittermayer-Schmittmann, Felix | |||
| 3 | DATE/TIME | Date/Time | Mittermayer-Schmittmann, Felix | Geocode | ||
| 4 | LATITUDE | Latitude | Mittermayer-Schmittmann, Felix | Geocode | ||
| 5 | LONGITUDE | Longitude | Mittermayer-Schmittmann, Felix | Geocode | ||
| 6 | Sample elevation | Elevation | m | Mittermayer-Schmittmann, Felix | ||
| 7 | Date/Time local | Date/Time local | Mittermayer-Schmittmann, Felix | |||
| 8 | DEPTH, water | Depth water | m | Mittermayer-Schmittmann, Felix | Geocode | |
| 9 | Pressure, water | Press | dbar | Mittermayer-Schmittmann, Felix | CTD | |
| 10 | Temperature, water | Temp | °C | Mittermayer-Schmittmann, Felix | CTD | |
| 11 | Salinity | Sal | Mittermayer-Schmittmann, Felix | CTD | ||
| 12 | Conductivity | Cond | mS/cm | Mittermayer-Schmittmann, Felix | CTD | |
| 13 | Oxygen | O2 | µmol/l | Mittermayer-Schmittmann, Felix | CTD | |
| 14 | Oxygen saturation | O2 sat | % | Mittermayer-Schmittmann, Felix | CTD |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
40698 data points
Download Data
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