Particulate organic carbon, nitrogen, and 234Th adsorbed onto particles were measured at 6 depths spanning the euphotic zone (surface to 65 m depth). 4-L samples were vacuum filtered through pre-combusted quartz microfiber (QMA) filters. Filtrate after filtration was collected and filtered through another filter to serve as an adsorption blank. Filters were dried and mounted in RISO planchets. Samples were then counted in a RISO low-level beta multi-counter to determine activity of 234Th. Background counts were conducted >6 half-lives after collection. Samples were then acidified to remove CaCO3 and analyzed in an elemental analyzer to determine particulate organic carbon and particulate nitrogen on filters. For additional details, see Stukel et al. (2015) and Stukel et al. (2022).
Stukel, M. (2022) Particulate organic carbon, nitrogen, and 234Th during the 2012-2013 Palmer Field Season (WAP Carbon export project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2022-08-02 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/881116 [access date]
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