Dataset: Thorium-234 data from SalpPOOP cruise on the R/V Tangaroa to the Chatham Rise (subtropical and subantarctic waters) in October and November 2018

Final no updates expectedDOI: 10.26008/1912/bco-dmo.883989.1Version 1 (2022-12-16)Dataset Type:Cruise Results

Principal Investigator: Michael R. Stukel (Florida State University)

Co-Principal Investigator: Moira Decima (University of California-San Diego Scripps)

Co-Principal Investigator: Thomas Kelly (University of Alaska Fairbanks)

BCO-DMO Data Manager: Taylor Heyl (Woods Hole Oceanographic Institution)


Project: Collaborative Research: Quantifying trophic roles and food web ecology of salp blooms of the Chatham Rise (Salp Food Web Ecology)


Abstract

This dataset represents Thorium-234 data from samples in the water column at the Chatham Rise (subtropical and subantarctic waters) on the Tangaroa Cruise 1810 (aka SalpPOOP cruise) in October and November 2018.

This dataset represents water column Thorium-234 data from the SalpPOOP, Tangaroa Cruise 1810 (aka SalpPOOP cruise). Salinity and density were measured using a CTD.  4-liter (L) samples for total water-column 234Th activity were collected using CTD bottles at approximately 12 depths from the surface to approximately 300 meters.  Samples were acidified with nitric acid to a pH < 2, and a Th-230 tracer spike was added.  Samples were shaken and allowed to equilibrate for 4 to 9 hours.  Samples were then re-basified with ammonium hydroxide to a pH of 8-9, shaken, and allowed to equilibrate for more than 8 hours.  Samples were then vacuum filtered at high vacuum pressure through a quartz (QMA) filter.  Filters were mounted in RISO planchets and counted on a RISO low-level beta multi-counter at Palmer Station, Antarctica.  Following a background count > 6 months later, samples were dissolved in 8M nitric acid / 10% hydrogen peroxide solution and a Th-229 tracer spike was added.  Samples were then analyzed on an ICP-MS to quantify the Th-229:Th-230 ratio, which was used to calculate the initial precipitation and filtration yield of Th-234.  Protocols from Pike et al. (2005) were followed. 

For additional sampling details see Decima et al. (in review, Nat. Comm.).


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Methods

Décima, M., Stukel, M. R., Nodder, S. D., Gutiérrez-Rodríguez, A., Selph, K. E., dos Santos, A. L., Safi, K., Kelly, T. B., Deans, F., Morales, S. E., Baltar, F., Latasa, M., Gorbunov, M. Y., & Pinkerton, M. (2022). Salp blooms increase carbon export 5-fold in the Southern Ocean. https://doi.org/10.1101/2022.02.07.479467
Methods

Pike, S. M., Buesseler, K. O., Andrews, J., & Savoye, N. (2005). Quantification of 234Th recovery in small volume sea water samples by inductively coupled plasma-mass spectrometry. Journal of Radioanalytical and Nuclear Chemistry, 263(2), 355–360. doi:10.1007/s10967-005-0062-9