Citation:

PANGAEA.996195

Name: Physical oceanography during ALKOR cruise AL610
Published: 2026-07-29
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Baltic Sea; CTD casts; RV ALKOR; Timeseries

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Published: 2026-07-29 • DOI registered: 2026-08-27

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Abstract:

Conductivity-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.

Keyword(s):

Baltic Sea; CTD casts; RV ALKOR; Timeseries

Related to:

Mittermayer, Felix H (2024): Baltic April 2024 Cruise No. AL610. GEOMAR Helmholtz Centre for Ocean Research Kiel, https://doi.org/10.3289/CR_AL610

Coverage:

Median Latitude: 55.078974 * Median Longitude: 14.638717 * South-bound Latitude: 54.140105 * West-bound Longitude: 10.021337 * North-bound Latitude: 55.792648 * East-bound Longitude: 16.500337

Date/Time Start: 2024-04-04T09:20:37 * Date/Time End: 2024-04-15T04:00:34

Minimum Elevation: -95.0 m * Maximum Elevation: -12.0 m

Event(s):

AL610_1-1 * Latitude: 54.550540 * Longitude: 10.197250 * Date/Time: 2024-04-04T09:18:45 * Elevation: -19.0 m * O2A Registry URI: https://registry.o2a-data.de/items/13724 * Campaign: * Basis: * Method/Device: (CTD-RO)

AL610_2-1 * Latitude: 54.690220 * Longitude: 10.393950 * Date/Time: 2024-04-04T12:13:36 * Elevation: -31.0 m * O2A Registry URI: https://registry.o2a-data.de/items/13724 * Campaign: * Basis: * Method/Device: (CTD-RO)

AL610_3-1 * Latitude: 54.690060 * Longitude: 10.336710 * Date/Time: 2024-04-04T18:47:37 * Elevation: -24.0 m * O2A Registry URI: https://registry.o2a-data.de/items/13724 * Campaign: * Basis: * Method/Device: (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	Pressure, water	Press	dbar	Mittermayer-Schmittmann, Felix	CTD
9	Temperature, water	Temp	°C	Mittermayer-Schmittmann, Felix	CTD
10	Salinity	Sal		Mittermayer-Schmittmann, Felix	CTD
11	Conductivity	Cond	mS/cm	Mittermayer-Schmittmann, Felix	CTD
12	Density, sigma-theta (0)	Sigma-theta	kg/m³	Mittermayer-Schmittmann, Felix	CTD
13	Oxygen	O2	µmol/l	Mittermayer-Schmittmann, Felix	CTD
14	Oxygen saturation	O2 sat	%	Mittermayer-Schmittmann, Felix	CTD
15	Sound velocity in water	SV	m/s	Mittermayer-Schmittmann, Felix	CTD

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

51568 data points

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