| Summary: | Maintenance and Update Frequency: notPlanned Statement: A total of 8 CTD (conductivity-temperature-depth, SeaBird 704, SeaBird Inc., Bellevue, USA) casts were undertaken within the Dalton (n = 4), Mertz (n = 4) polynyas. Seawater samples to measure 234Th were collected from Niskin bottles triggered at various depths during the CTD cast. Between 6 and 16 depths down to 800 m. Seawater samples were treated following the manganese oxide precipitation technique (Benitez-Nelson et al. 2001, Clevenger et al. 2021). Samples were prepared and counted on board using a low-level background beta counter (RISØ, Denmark). Second counting was conducted >6 months later and chemical recoveries were obtained by ICP-MS at the Alfred Wegener Institute (Germany). 238U concentrations were derived from salinity values following the U-S relationship from Owens et al. 2011. Credit Aurora Australis Voyage 2 2016/17 Credit Edith Cowan University Credit V. Puigcorbé was supported by Edith Cowan University through an Early Career Researcher Grant (G1003456) and an ECU-Collaboration Enhancement Scheme grant Thorium-234 samples were collected to determine the particulate organic carbon (POC) export fluxes in two East Antarctica polynyas, Dalton and Mertz. The samples were collected along the water column using the CTD deployed at several stations. The seawater Th-234 data was used in combination with POC:234Th ratios obtained from particulate samples collected using in situ pumps in order to derive the POC fluxes. This record describes Th-234 and U-238_data: sample ID, depth, CTD file, station ID, latitude and longitude, Th-234 concentration and its uncertainty, U-238 concentration and its uncertainty. See linked record for associated POC data from Aurora Australis Voyage 2 2016/17.
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