National Coral Reef Monitoring Program: Shallow Water Conductivity-Temperature-Depth (CTD) Profiles for select locations across the Mariana Archipelago since 2014

Nearshore and offshore Conductivity-Temperature-Depth (CTD) casts were collected at sites in the Hawaiian Archipelago as part of the National Coral Reef Monitoring Program (NCRMP). These surveys were conducted by the NOAA Pacific Islands Fisheries Science Center (PIFSC), Ecosystem Sciences Division (ESD; formerly the Coral Reef Ecosystem Division) during ESD-led NCRMP missions in the Mariana Archipelago in 2014, 2017, 2022, and 2025. The CTD casts provide vertical profiles (downcast only) of water column conductivity, temperature, and pressure with calculated depth, salinity, and water density.

Nearshore CTD (Sea-Bird Electronics SBE19plus in 2014 and 2017; RBR Concerto 3 in 2022 and 2025 casts were collected from a small boat using a hand line and held just under the surface for 1 minute. Data were collected by lowering the CTD in profiling mode at an even pace (descent rate ~0.5 to 0.75 meters per second) to a maximum depth of ~30 m. Offshore (~10-15km from land) CTD profiles were collected from the ship using a SBE19plus (2014 and 2017), RBR concerto 3 (2022 and 2025). Offshore casts were typically conducted to a maximum depth of ~10m, though deeper profiles (down to ~500m) were collected at some locations and years. Data processing was performed using Sea-Bird Scientific SBE or RBR Ruskin Data Processing Software and the R package "oce".

Tags: 743, agrihan island, agrihan island (18n145e0002), aguihan, aguihan island (aguijan) (14n145e0006), aguihan island reefs, alamagan island, alamagan island (17n145e0002), aquatic habitat, asuncion island, asuncion island (19n145e0001), biosphere, climate change, cnmi, coastal processes, commonwealth of the northern mariana islands, conductivity, conductivity profiles, coral reef, coral reef conservation program, coral reef ecosystem division, coral reef ecosystem program, coral reef studies, coral reefs, corals, country/territory, cred, crep, ctd, density, depth, depth - sensor, doc/noaa/nmfs/pifsc, doc/noaa/nmfs/pifsc/esd, earth science, ecosystem sciences division, ecosystems, esd, farallon de pajaros, farallon de pajaros (20n144e0001), guam, guam (13n144e0000), guguan, guguan island, guguan island (17n145e0001), hi'ialakai, in situ, in situ physical, mariana archipelago, mariana islands, marianas, marianas archipelago, marianas trench marine national monument, marine ecosystems, maug, maug island, maug island (20n145e0001), micronesia, national coral reef monitoring program, national marine fisheries service, ncrmp, nmfs, noaa, nodc ocean acidification scientific data stewardship, northern mariana islands, northern mariana islands ( cnmi ) (18n146e0000), numeric data sets, nw pacific, ocean, ocean acidification program, ocean basin, ocean pressure, ocean salinity, ocean temperature, oceanography, oceans, office of oceanic and atmospheric research, oscar elton sette, pacific islands fisheries science center, pacific ocean, pagan, pagan island, pagan island (18n145e0001), physical, pifsc, pressure - water [hydrostatic pressure], profile, rainier, ramp, reef, reef assessment and monitoring program, reef habitat, reef monitoring and assessment, rota, rota island, rota island ( luta ) (14n145e0007), saipan, saipan island, saipan island (15n145e0002), salinity, salinity/density, sarigan island, sarigan island (16n145e0003), sea level pressure, sigma-t, small boat, temperature, tinian, tinian island (14n145e0005), tinian island reefs, u.s. department of commerce, united states of america, us doc, water temperature, western pacific ocean, zoology
Organization: National Oceanic and Atmospheric Administration, Department of Commerce