Boron isotope pH calibration of a shallow dwelling benthic nummulitid foraminifera DOI Creative Commons
Douglas Coenen, David Evans, Hagar Hauzer

и другие.

Geochimica et Cosmochimica Acta, Год журнала: 2024, Номер 378, С. 217 - 233

Опубликована: Июнь 24, 2024

The boron isotope palaeo-pH/CO2 proxy is one of the key quantitative tools available to reconstruct past changes in concentration CO2 atmosphere. In particular, marine calcifying organisms have been shown be useful archives this proxy, enabling variations pH/CO2 reconstructed throughout Cenozoic. order provide an alternative archive widely used planktonic foraminifera, we investigated symbiont-bearing, high-Mg, shallow-dwelling, tropical large benthic foraminifera (LBF) species Operculina ammonoides and present a calibration relationship between shell isotopic composition seawater pH. We specimens collected from both several reefs as well grown laboratory culture experiments which pH DIC were decoupled each other, measuring newly-formed chambers using laser-ablation sample introduction technique. Based on our samples, resulting linear in-situ aqueous borate ion (B(OH)4−) shells O. characterised by gradient 0.38-0.10+0.12. contrast, field samples displays near 1:1 with B(OH)4−. suggest that shallow slope regression result difference their micro-environment carbonate chemistry surrounding driven dependence relative rates calcification photosynthesis. model effect these processes diffusive boundary layer, show expected free micro-turbulence, but not foraminifer's natural environment. As such, demonstrate utility archive, while also highlighting how experimental design has potential drive important size. Given genus originated late Palaeocene, work paves way towards deep-time reconstructions foraminifer very closely related modern representative.

Язык: Английский

Excess alkalinity and its impacts on pCO2 estimation in coastal and estuarine waters of the Yellow Sea DOI
Young Ho Ko,

Seung-Hee Shin,

Seong‐Gil Kim

и другие.

Marine Chemistry, Год журнала: 2025, Номер unknown, С. 104499 - 104499

Опубликована: Фев. 1, 2025

Язык: Английский

Процитировано

0
Boron isotope pH calibration of a shallow dwelling benthic nummulitid foraminifera DOI Creative Commons
Douglas Coenen, David Evans, Hagar Hauzer

и другие.

Geochimica et Cosmochimica Acta, Год журнала: 2024, Номер 378, С. 217 - 233

Опубликована: Июнь 24, 2024

The boron isotope palaeo-pH/CO2 proxy is one of the key quantitative tools available to reconstruct past changes in concentration CO2 atmosphere. In particular, marine calcifying organisms have been shown be useful archives this proxy, enabling variations pH/CO2 reconstructed throughout Cenozoic. order provide an alternative archive widely used planktonic foraminifera, we investigated symbiont-bearing, high-Mg, shallow-dwelling, tropical large benthic foraminifera (LBF) species Operculina ammonoides and present a calibration relationship between shell isotopic composition seawater pH. We specimens collected from both several reefs as well grown laboratory culture experiments which pH DIC were decoupled each other, measuring newly-formed chambers using laser-ablation sample introduction technique. Based on our samples, resulting linear in-situ aqueous borate ion (B(OH)4−) shells O. characterised by gradient 0.38-0.10+0.12. contrast, field samples displays near 1:1 with B(OH)4−. suggest that shallow slope regression result difference their micro-environment carbonate chemistry surrounding driven dependence relative rates calcification photosynthesis. model effect these processes diffusive boundary layer, show expected free micro-turbulence, but not foraminifer's natural environment. As such, demonstrate utility archive, while also highlighting how experimental design has potential drive important size. Given genus originated late Palaeocene, work paves way towards deep-time reconstructions foraminifer very closely related modern representative.

Язык: Английский

Процитировано

3