O'Sullivan, Edel Mary; Steiner, Zvi (2025): Dissolved major element concentration data of the Equatorial Pacific Ocean transect during RV SONNE cruise SO298 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.977810
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Published: 2025-03-24 • DOI registered: 2025-04-22
Abstract:
This dataset presents absolute salinity-normalized dissolved major element (Ca, Mg, K, Sr, Li) concentrations along RV SONNE cruise track SO298 along the Equatorial Pacific Ocean collected during GEOTRACES GP11 expedition (Guayaquil, Ecuador - Townsville, Australia) from April 14th to June 2nd, 2023. Samples were collected from the trace-metal clean Ti-frame rosette equipped with a Kevlar-coated winch. Samples were filtered through 0.2 µm AcroPak™ 500 filter capsules, collected in acid-cleaned 4 mL PP tubes, and acidified to pH ~2 with trace metal-grade HCl. Samples were analysed for Na, Ca, Mg, K, Li and Sr using a Varian-720 ES ICP-OES. Samples were diluted by a factor of 78-82 in 0.12 M HCl to the same final salinity. Multiple spectral lines were selected for each element, and samples were corrected for instrumental drift by sample-standard bracketing with IAPSO P166 diluted to the same final salinity. Calibration was performed on 7 dilutions of IAPSO P166. Element-to-sodium ratios were calculated for all combinations of spectral lines. Assuming a constant Na-to-salinity (PSU)=35 ratio, the element/Na ratios were multiplied by 0.46847 µmol kg-1 to obtain the salinity (PSU)-normalized element concentration, and by the ratio of practical to absolute salinity (TEOS-10). The TEOS-10 absolute salinities were calculated from EOS-80 values using the Gibb's Oceanographic Toolbox using the R package 'gsw' (v 1.1-1).
Project(s):
Funding:
Deutsche Forschungsgemeinschaft, Bonn (DFG), grant/award no. 458035111: Biogeochemistry of major elements in the Atlantic and Pacific Oceans
Coverage:
Median Latitude: -0.212001 * Median Longitude: -137.569988 * South-bound Latitude: -2.271500 * West-bound Longitude: 157.858000 * North-bound Latitude: 0.002720 * East-bound Longitude: -81.293900
Date/Time Start: 2023-04-15T15:01:13 * Date/Time End: 2023-05-25T20:33:23
Minimum DEPTH, water: 1.0 m * Maximum DEPTH, water: 4949.7 m
Event(s):
SO298_0_Underway-6 * Latitude: -2.499880 * Longitude: -80.999900 * Date/Time: 2023-04-15T15:01:13 * Elevation: -116.8 m * Campaign: SO298 (GEOTRACES GP11) * Basis: Sonne_2 * Method/Device: Fish undulating, recording system tow (FISH)
SO298_2-2 * Latitude: -1.796970 * Longitude: -81.901830 * Date/Time: 2023-04-15T23:38:38 * Elevation: -1712.5 m * Campaign: SO298 (GEOTRACES GP11) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO) * Comment: Ti-CTD
SO298_5-1 * Latitude: -1.099980 * Longitude: -86.100000 * Date/Time: 2023-04-17T20:35:30 * Elevation: -2106.8 m * Campaign: SO298 (GEOTRACES GP11) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO) * Comment: Ti-CTD
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
6047 data points
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