Dissolved trace metal (Fe, Ni, Cu, Zn, Cd, Pb) concentrations in the Indian and Pacific sectors of the Southern Ocean from the Antarctic Circumnavigation Expedition (2016-2017). ***** Dataset abstract ***** Dissolved trace metal (Fe, Ni, Cu, Zn, Cd, Pb) concentrations measured on seawater samples from the Southern Ocean. Samples were collected with a trace metal clean rosette system to a maximum depth of 1000 m during Legs 1 and 2 of the Antarctic Circumnavigation Expedition (ACE), 2016-2017. Samples were filtered through Akropak Supor filters (0.2 um) in a class 100 clean container, acidified to pH ≤ 2 and stored until analysis (>6 months). Samples from Leg 1 (TMR Casts 3-7) were collected during a transect from Cape Town, South Africa to Hobart, Australia. Samples from Leg 2 (TMR casts 8-20) were collected during a transect from Hobart, Australia to Punta Arenas, Chile. Data cover environments near subantarctic and Antarctic islands (TMR 3, 4, 13-15), in the Mertz Glacier Polynya (TMR 11-12) and near the Antarctic Peninsula (TMR 18), as well as meridional transects to and from the Antarctic continent (TMR 7-12, TMR 18-20). ***** Sampling and Analysis ***** Dissolved seawater samples were collected with a trace metal clean rosette system, gravity filtered through 0.2 um capsule filters and acidified to pH ≤ 2 either aboard the ship or on land. Samples were stored for >3 months before analysis. Samples from this dataset were analyzed in two ways: 1) 250 mL dissolved metal concentration samples were analyzed by isotope dilution. Samples were first spiked with enriched isotope spikes and internal standards, then were preconcentrated using an automated, home-built extraction system. Eluted samples were analyzed by inductively coupled mass spectrometry using either a ThermoFisher Neptune or Element XR instrument at the Australian National University. All data from Leg 1 (TMR 3-7) and for Ni, Cu, Cd and Pb from Leg 2 (TMR 8-20) were determined in this way. 2) 1-4 L samples for stable isotope composition were analyzed by isotope dilution. Sample were first spiked with Fe and Zn double spikes and Fe and Zn were extracted by column chromatography using Nobias PA1 chelate followed by AG-MP1 resin. Samples were analyzed at ETH Zurich (Zn) or the University of South Florida (Fe) using a Neptune Plus instrument (ThermoFisher). These data were used for Fe and Zn from Leg 2 (TMR 8-20). ***** Quality checking ***** Precision is reported as the standard deviation of replicate analyses (all data Leg 1, Ni, Cu, Cd, Pb from Leg 2) or as 2% RSD external reproducibility estimated for Leg 2 Fe and Zn data. Replicates were not measured in cases where no uncertainty is reported. Quality checking included the following methods: -Analysis of reference materials (see below) -Comparison with literature data from crossover stations and from intercalibration samples -Replicate extractions and analyses of samples on different days -Assessment of oceanographic consistency (i.e. if the data are explained by the known physical, chemical and biological controls on element distributions in the ocean, and if depth profiles transition smoothly between data points rather than erratically jumping between high and low values. Values deemed oceanographically inconsistent are marked with a *. ***** Standards ***** Analytical accuracy was determined by analysis of seawater reference materials (SAFe standards, samples from the GEOTRACES IC1 cruise) and compared to previously published values and consensus values. ***** Further information for interpreting the data and using the dataset ***** NAN indicates not a number, no value available for this cell. NA indicates not applicable. A quality flag of 9 denotes samples deemed to be oceanographically inconsistent. These datapoints are suspected of contamination. They have not been not removed from the data set but should not be used for interpretations of the data. A quality flag of 1 indicates samples with deemed to be consistent and accurate. Snow samples (unfiltered) were collected on the flanks of Mt. Siple and were analyzed with the dissolved seawater samples. In the event that there are any accidental typographical errors resulting in disagreement between the Date_Time column and the time and date information in the Time and ACE_Sample_ID columns, the latter two should be taken as correct. The following data are related to this dataset: ACE CTD data are available from Henry et al. (2019, doi: 10.5281/zenodo.3247384). ACE macronutrient data are available from Hassler & Ellwood (2019, doi: 10.5281/zenodo.2616606). ACE dissolved chromium concentrations and stable isotope compositions (Legs 1 and 2) are available from Rickli et al. (2019, doi: 10.1016/j.gca.2019.07.033) as well as the Zenodo dataset doi: 10.5281/zenodo.3250980. ACE dissolved zinc concentrations and stable isotope compositions (Legs 2 and 3) are available from Sieber et al. (2020, doi: 10.1016/j.gca.2019.09.039). ACE dissolved cadmium concentrations and stable isotope compositions (Legs 2 and 3) are available from Sieber et al. (2019; doi: 10.1016/j.epsl.2019.115799). ***** Dataset contents ***** - ACE_TM_concentrations.csv, data file, comma-separated values - data_file_header.txt, metadata, text format - README.txt, metadata, text format ***** Dataset contact ***** Janssen, David J., University of Bern, Switzerland. ORCID: 0000-0002-9091-8936 david.janssen@geo.unibe.ch ***** Dataset license ***** This trace metal concentration dataset is made available under the Creative Commons Attribution 4.0 International License (CC BY 4.0) whose full text can be found at https://creativecommons.org/licenses/by/4.0/ ***** Dataset citation ***** Janssen, D.J., Sieber, M., Ellwood, M.J., Conway, T.M., Barrett, P.M., Chen, X., de Souza, G.F., Hassler, C.S., Jaccard, S.L. (2020). Dissolved trace metal (Fe, Ni, Cu, Zn, Cd, Pb) concentrations in the Indian and Pacific sectors of the Southern Ocean from the Antarctic Circumnavigation Expedition (2016-2017). (Version 1.0) [Data set]. Zenodo. http://doi.org/10.5281/zenodo.3634411 This dataset is a companion to the following publication in Marine Chemistry: Janssen, D.J., Sieber, M., Ellwood, M.J., Conway, T.M., Barrett, P.M., Chen, X., de Souza, G.F., Hassler, C.S., Jaccard, S.L. (2020). Trace metal and nutrient dynamics across broad biogeochemical gradients in the Indian and Pacific sectors of the Southern Ocean. Marine Chemistry. https://doi.org/10.1016/j.marchem.2020.103773