Seabed grain-size data from Harrison Bay (Beaufort Sea continental shelf), Alaska, 2019-2022

This file contains grain-size data from seabed shipek grab samples collected from R/V Sikuliaq and its workboat in 2019 and 2020 and R/V Ukpik in 2021 and 2022. Samples were collected from across Harrison Bay on the Alaskan Beaufort Shelf, north of the Colville River and between Oliktok Point and Cape Halkett. A few samples were collected farther east. Samples were collected using a shipek grab sampler or miniature hand-operated van veen sampler. In 2019, samples were collected in October-November. In 2020, samples were collected in September. In 2021, samples were collected in July-August. In 2022, samples were collected in August-September. Samples were bagged in the field and returned to the lab (at University of North Carolina-Chapel Hill or Oregon State University) where grain-size analyses were performed using an Escitec Bettersizer S3Plus laser diffraction sensor (the same sensor was used for all samples) Samples were sonicated for two minutes prior to analyses. Samples ranged from well sorted sands (typically medium sand or fine) to poorly sorted bimodal sands and muds to unimodal muds. In the field, samples exhibited diverse textures including mud clasts and very stiff muds.