Pore water data from sediment cores collected from R/V Oceanus cruise OC1906A and R/V Sikuliaq cruise SKQ202016S off the coast of California in 2019 and 2020

Sediment pore waters were determined in cores collected at several stations off the coast of California: at a site in Santa Barbara Basin ('SBB'; latitude: 34.223, Longitude: -119.986; water depth, 590 m); Catalina Basin ('Cat'; latitude: 33.301, longitude: -118.6; water depth, 1310 m); and two sites off the coast of central California south of Monterey Bay; site 'K' (latitude 35.375, longitude -121.501, water depth, 1000 m) and site 'D' (latitude 36.113, longitude: -122.186, water depth, 1440 m). The Cat cores were collected in June 2019, while the site K and D cores were collected in December 2020. Pore waters were collected either using rhizon samplers or by centrifugation of sectioned sediments. Pore water samples were analyzed for alkalinity on-board the ship, while other analyses were returned to the shore-based lab at Old Dominon University (ODU) where they were analyzed. These samples were collected as part of a larger project examining deaminated peptides and organic matter cycling in the sediments at these sites.