Roca-Martí, Montserrat; Healey, Madeline; Kienast, Stephanie S (2025): Total (dissolved + particulate) Th-234 and U-238 activities in seawater in the Labrador Sea in spring 2022 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983957
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Published: 2025-07-23 • DOI registered: 2025-08-21
Abstract:
Total (dissolved + particulate) Th-234 and U-238 activities in seawater in the Labrador Sea from 19 May to 2 June 2022 during the BELAS-1 expedition (CE22009, RV Celtic Explorer). Water column samples were taken in the upper 500 m using a CTD-rosette at 15 discrete depths. Unfiltered seawater samples (2 L) were processed on board and analyzed for the activity of total Th-234 following the method described in Clevenger et al. (2021). The U-238 activity was derived from salinity (Owens et al., 2011).
Supplement to:
Roca-Martí, Montserrat; Healey, Madeline; McBride, Colleen E; Sipler, Rachel E; Devred, Emmanuel; Cisternas-Novoa, Carolina; Romanelli, Elisa; Ohashi, Kyoko; Kienast, Stephanie S (preprint): Sinking particle fluxes and biological carbon pump efficiency in the Labrador Sea during a Phaeocystis bloom decline. https://doi.org/10.5194/egusphere-2025-3671
Related to:
Ward, Brian; Kienast, Stephanie S; cruise participants (2022): North-West Atlantic Biological Carbon Pump
(NWA-BCP) Cruise Report, May/June 2022,
R/V Celtic Explorer. nwa-bcp_cruise_report_CE22009.pdf
References:
Clevenger, Samantha J; Benitez-Nelson, Claudia R; Drysdale, Jessica A; Pike, Steven M; Puigcorbé, Viena; Buesseler, Ken O (2021): Review of the analysis of 234Th in small volume (2–4 L) seawater samples: improvements and recommendations. Journal of Radioanalytical and Nuclear Chemistry, 329(1), 1-13, https://doi.org/10.1007/s10967-021-07772-2
Owens, Stephanie A; Buesseler, Ken O; Sims, Kenneth W W (2011): Re-evaluating the 238U-salinity relationship in seawater: Implications for the 238U–234Th disequilibrium method. Marine Chemistry, 127(1-4), 31-39, https://doi.org/10.1016/j.marchem.2011.07.005
Funding:
Natural Sciences and Engineering Research Council (NSERC), grant/award no. NWA-BCP: The Northwest Atlantic Biological Carbon Pump
Coverage:
Median Latitude: 58.249305 * Median Longitude: -49.841993 * South-bound Latitude: 56.653300 * West-bound Longitude: -52.470100 * North-bound Latitude: 59.506900 * East-bound Longitude: -48.616000
Date/Time Start: 2022-05-19T12:12:00 * Date/Time End: 2022-06-02T10:39:00
Minimum DEPTH, water: 3.7 m * Maximum DEPTH, water: 505.6 m
Event(s):
CE22009_4_Day (CTD_cast_8) * Latitude: 58.816700 * Longitude: -49.110000 * Date/Time: 2022-05-20T16:47:00 * Location: Labrador Sea * Campaign: CE22009 (BELAS-1) * Basis: Celtic Explorer * Method/Device: CTD/Rosette (CTD-RO)
CE22009_6_Day (CTD_cast_11) * Latitude: 58.816700 * Longitude: -49.443400 * Date/Time: 2022-05-21T16:28:00 * Location: Labrador Sea * Campaign: CE22009 (BELAS-1) * Basis: Celtic Explorer * Method/Device: CTD/Rosette (CTD-RO)
CE22009_7_Day (CTD_cast_51) * Latitude: 58.816700 * Longitude: -49.610100 * Date/Time: 2022-06-02T10:39:00 * Location: Labrador Sea * Campaign: CE22009 (BELAS-1) * Basis: Celtic Explorer * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Kienast, Stephanie S | |||
| 2 | LATITUDE | Latitude | Kienast, Stephanie S | Geocode | ||
| 3 | LONGITUDE | Longitude | Kienast, Stephanie S | Geocode | ||
| 4 | DEPTH, water | Depth water | m | Kienast, Stephanie S | Geocode | |
| 5 | Bottle number | Bottle | Kienast, Stephanie S | |||
| 6 | DATE/TIME | Date/Time | Kienast, Stephanie S | Geocode | ||
| 7 | Uranium-238 | 238U | dpm/l | Kienast, Stephanie S | ||
| 8 | Uranium-238, standard deviation | 238U std dev | ± | Kienast, Stephanie S | ||
| 9 | Thorium-234, total | 234Th tot | dpm/l | Kienast, Stephanie S | ||
| 10 | Thorium-234, total, standard deviation | 234Th std dev | ± | Kienast, Stephanie S |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1105 data points