See Carpenter et al. (2018) for a detailed overview of the methodology of the experiment designed to measure coral reef community metabolism responses to ocean acidification over a 4-month period from November 13th, 2015 to March 15th, 2016 in outdoor flumes at the UCB Gump Research Station Moorea, French Polynesia.

Carbonate chemistry data:
The pH, measured on the total hydrogen ion scale (pHT), was monitored daily at the down-stream end of the flumes with a handheld electrode (DG 115-SC electrode (Mettler-Toledo). Seawater carbonate chemistry and salinity were measured weekly, both in the day (02:00) and night (20:00); salinity was measured using a bench-top conductivity meter (Thermo Scientific, Orionstar A212, Waltham, MA, USA). The parameters of the seawater carbonate system were calculated from measurements of temperature, salinity, pHT, and AT, using the R package seacarb (Lavigne and Gattuso 2013).

Community composition:
~ 25% coral cover, comprised of 11% cover of massive Porites spp., 7% Porites rus, 4% Montipora spp. and 3% Pocillopora spp. There was ~ 7% cover of crustose coralline algae (CCA), with 4% Porolithon onkodes and 3% Lithophyllum kotschyanum, and ~ 5% cover of small pieces (i.e., ~ 1-cm diameter) of coral rubble (Fig. S2, Carpenter et al., 2018)."