Conductivity Temperature and Depth (CTD) Data from the 2025K19 Cruise with KBV 181, 19 - 22 May 2025

SWERVE Data Package: 2025K19 KBV 181

Cruise Information:
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Cruise Name: 2025K19
Purpose of the Cruise: What are the environmental risks associated with seabed mining for rare earth elements in the Baltic Sea? Quantifying impacts on benthic biodiversity and ecosystem processes.
Ship: KBV 181
Ship Code: 77K9
Cruise Number: 19
Cruise Dates: 2025-05-19 to 2025-05-22
Geographical Area: Bothnian Bay
PI: Francisco Nascimento, Stockholm University
Awards: Grant to research infrastructure of national interest 2023-00159, Swedish Research Council

Data Package Contents:
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This package contains 12 CTD casts collected during the cruise. Each cast has 6 files - 4 raw files (.bl, .hdr, .hex, .xmlcon) and 2 processed files (.asc, .cnv).

File Naming Convention:
All files follow the SWERVE naming convention:
[INSTRUMENT]_[SERIAL NUMBER]_[YYYYMMDD]_[HHMM]_[SHIPCODE]_[CRUISE]_[STATION]

Where:
- INSTRUMENT: CTD instrument type (e.g., SBE09)
- SERIAL NUMBER: CTD instrument serial number
- YYYYMMDD: Date of cast
- HHMM: Time of cast
- SHIPCODE: Ship code
- CRUISE: Cruise number
- STATION: Station number

Folders follow the same convention but without time and station number.

Measured Variables:
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The following variables are included in the processed data files:

prDM: Pressure, Digiquartz [db]
c0S/m: Conductivity [S/m]
t090C: Temperature [ITS-90, deg C]
par/sat/log: PAR/Logarithmic, Satlantic [umol photons/m^2/sec]
spar/sat/lin: SPAR/Linear, Satlantic [umol photons/m^2/sec]
dz/dtM: Descent Rate [m/s]
sbeox0ML/L: Oxygen, SBE 43 [ml/l] ***PLEASE OBSERVE THAT OXYGEN DATA ARE CORRUPT, THE SENSOR WAS NOT WORKING DURING THIS CRUISE***
density00: Density [density, kg/m^3]
sal00: Salinity, Practical [PSU]
depFM: Depth [fresh water, m], lat = 64.416
nbin: number of scans per bin