anonymous 16352 B/Ca, δ¹¹B and calcifying fluid carbonate chemistry reconstruction of Porites sp. fromTonga (TNI2) Todorovic, Sara; Dissard, Delphine; Linsley, Braddock K; Benthien, Albert; Richter, Klaus-Uwe; Bijma, Jelle; Wu, Henry C (2026): B/Ca, δ¹¹B and calcifying fluid carbonate chemistry reconstruction of Porites sp. fromTonga (TNI2) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.972838 Samples were collected from two Porites sp. coral cores in the Southwestern Pacific, specifically at Nomuka Iki Island (Tonga). Parameters measured in this study include boron stable isotope analysis (δ11B) and Boron/Calcium (B/Ca) ratios. The Tonga coral core (TNI2) yielded 224 samples covering the period from 1777 to 2004 out of which 123 were analyzed for δ11B. δ11B measurements were conducted on NuPlasma II MC-ICP-MS and boron was concentrated using the micro-distillation (sublimation) method. B/Ca was originally analyzed in every to every second millimeter resolution, providing approximately bimonthly resolution, on Analytik Jena PlasmaQuant Elite ICP-MS. That data was annualized for this study and here it is attached in its annual resolution. The carbonate chemistry of the calcifying fluid was reconstructed using δ11B and B/Ca ratios yielding reconstructions of pHcf (calcifying fluid pH), pHsw (seawater pH), [CO3²] (carbonate ion concentration), DIC (dissolved inorganic carbon), and Ωcf (aragonite saturation state). Reconstructions of [CO3²], DIC and Ωcf were calculated using boronsysarag (DeCarlo et al., 2018;doi:10.5194/bg-15-2819-2018) and seacarb (Gattuso et al., 2021; https://cran.r-project.org/web/packages/seacarb/index.html) packages in R statistical software (R Core team, 2021; https://www.r-project.org/foundation/). 16360 https://doi.org/10.1594/PANGAEA.972838 2026-01-22T13:34:14+0000 2026 21919 21500 21501 21102 21920 21544 21921 21420 21922 21422 21923 21424 21425 21426 21924 21925 20186 18779 21428 21926 20166 19677