©2026 Biological and Chemical Oceanography Data Management Office.This dataset provides geochemical data (major ions) for porewaters from sediment pushcores collected by DSV Alvin from the R/V Atlantis in June 2024 (AT50-24) at methane seeps in the Aleutian Trench, Alaska, USA. Also included are geochemical data (major ions) for water samples collected by Niskin bottle, both via DSV Alvin and via CTD cast from the ship. Cores were sectioned into 1-3 centimeter (cm) horizons, and porewater was extracted shipboard using an argon-pressurized squeezer. Porewater s...
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Sediment pushcores were collected by DSV Alvin from the R/V Atlantis in May to June 2024 (AT50-24) at Edge Seep (57.4523, -148.0016), Shumagin Seep (54.3016, -157.1969), and Sanak Seep (53.7481, -162.5864). Pushcores were manually sectioned into 1 or 3 centimeter (cm) horizons using plastic rings, and porewaters were extracted using a KC Denmark squeezer. In addition, water samples were collected by Niskin bottle at the seeps using DSV Alvin, and by Niskin bottle from the CTD rosette from R/V Atlantis. Samples for ion chromatography were frozen shipboard and thawed immediately prior to analysis. Measurements were made using a Thermo Dual Dionex Integrion HPIC ion chromatography system with either a 250 millimeter (mm) Dionex IonPac AS19-4um column (anions) with 50 mm guard column or a 250 mm Dionex IonPac CS16-4 micrometer (um) column (cations) with a 50 mm guard column, in the Resnick Water and Environment Laboratory at the California Institute of Technology (Caltech).
Magyar, J. S., Orphan, V. J., Goffredi, S. (2026). Geochemical data from sediment pushcore porewaters and water column Niskin samples collected from the Gulf of Alaska, Alaska, USA, in May and June 2024 on R/V Atlantis cruise AT50-24. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2025-11-24 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.986675.1 [access date]
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This dataset is licensed under Creative Commons Attribution 4.0.
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