National Coral Reef Monitoring Program: Diel seawater carbonate chemistry observations from a suite of instrumentation deployed at coral reef sites at Tutuila Island, American Samoa in 2015 and 2018

The ocean acidification diel suite is an autonomous instrument package that measures diel variability in coral reef seawater carbonate chemistry. Diel suite surveys are conducted by the NOAA Pacific Islands Fisheries Science Center (PIFSC), Ecosystem Sciences Division (ESD) within coral reef ecosystems across the Pacific Islands Region as part of the NOAA National Coral Reef Monitoring Program (NCRMP). The data provided in this data set are from diel suites deployed at select sites at Tutuila Island in March 2015 and June - July 2018, during the ESD-led NCRMP missions to American Samoa.

Diel suites were deployed on the reef for at least 24 hours to measure in-situ salinity, temperature, pressure, pH, current direction and magnitude, and dissolved oxygen (starting 2018). Seawater samples were also collected for laboratory analyses of dissolved inorganic carbon (DIC) and total alkalinity (TA). Components of the carbonate system--including pH, pCO2 (partial pressure of carbon dioxide), and aragonite saturation state--are calculated from DIC, TA, temperature, salinity and pressure. Each diel suite typically consisted of: 1 SBE-19plus CTD sensor, 1 Nortek Acoustic Doppler Current Profiler (ADCP), 1 Satlantic SeaFET Ocean pH sensor, and up to 9 Programmable Underwater Collectors (PUCs), each of which collected 1 water sample at 3- or 4-hour intervals.  Starting 2018, 1 SBE-43 oxygen sensor is tethered to the CTD sensor for diel surveys. Diel surveys from 2019 also incorporate stand-alone PAR and DO loggers however they have yet to be conducted in American Samoa.  Instruments deployed, samples collected, and sample intervals are recorded in the summary file enclosed with the data package, and exceptions to the standard diel suite are also noted.

Tags: 743, adcp, alkalinity, alkalinity - total [total alkalinity], american samoa, american samoa (14s170w0000), aquatic habitat, aragonite saturation state, biosphere, calcification, carbon dioxide, carbonate chemistry, chemistry monitoring and assessment, climate change, coastal processes, conductivity, continuous, coral reef conservation program, coral reef ecosystem division, coral reef ecosystem program, coral reef studies, coral reefs, corals, coulometer for dic measurement, country/territory, cred, crep, ctd, ctd - moored ctd, current direction, current measurements, current speed, density, depth - sensor, diel, dissolution, dissolved gases, dissolved inorganic carbon, dissolved inorganic carbon (dic), dissolved oxygen, doc/noaa/nmfs/pifsc, earth science, ecosystem sciences division, esd, hi'ialakai, in situ, in situ chemical, in situ physical, national coral reef monitoring program, national marine fisheries service, ncrmp, nmfs, noaa, numeric data sets, ocean acidification, ocean basin, ocean chemistry, ocean circulation, ocean temperature, oceanography, oceans, oxygen, oxygen sensor, pacific islands fisheries science center, pacific ocean, partial pressure, partial pressure of carbon dioxide - water, ph, ph sensor, physical, pifsc, pressure - water [hydrostatic pressure], programmable underwater collector, puc, ramp, rapid ecological assessment, rea, reef assessment and monitoring program, reef habitat, reef monitoring and assessment, salinity, salinity - bottom water, salinity/density, saturation state, science, sigma-t, south pacific ocean, temperature sensor, time series profile, titrator, tutuila island (14s170w0016), u.s. department of commerce, united states of america, us doc, water chemistry, water current direction, water samples, water temperature, water velocity, zoology
Organization: National Oceanic and Atmospheric Administration, Department of Commerce