Reply on AC1

Published: Oct. 25, 2023

Abstract. Ocean alkalinity enhancement (OAE) aims to increase atmospheric CO₂ sequestration in the oceans through acceleration of chemical rock weathering. This could be achieved by grinding rocks containing alkaline minerals and adding powder surface ocean where it dissolves chemically locks seawater as bicarbonate. However, during dissolution coincides with release potentially bio-active chemicals may induce side effects. Here, we used 53 L microcosms test how coastal plankton communities from Tasmania respond OAE olivine (mainly Mg₂SiO₄) or steel slag CaO Ca(OH)₂) sources. Three were left unperturbed served a control, three enriched (1.9 g L⁻¹), (0.038 L⁻¹). Phytoplankton zooplankton community responses well some biogeochemical parameters monitored for 21 days. Olivine additions increased total 29 µmol kg⁻¹ 361 respectively, which corresponds theoretical 0.9 % 14.8 storage capacity CO₂. released silicate nutrients into water column, but considerably more also significant amounts phosphate. Both dissolved aluminium (> 400 nmol The addition manganese concentrations (784 while nickel (38 treatment particulate (22 (5 was consistent these trace metals seawater. There no difference chlorophyll between treatments likely due nitrogen limitation phytoplankton community. flow cytometry results indicated an cellular abundance several smaller (~<20 µm) groups compared control. larger (~>20 decreased much control than mineral after day 10. Furthermore, maximum quantum yields photosystem II (F_v/F_m) higher treatments, suggesting that photosynthetic performance. composition affected most notable changes being observed dinoflagellate Noctiluca scintillans appendicularian Oikopleura sp. Overall, is efficient removal appears less when relating potential level environmental impact here.

Language: Английский

---

Reply on RC1

Published: Dec. 11, 2023

Abstract. Ocean alkalinity enhancement (OAE) aims to increase atmospheric CO₂ sequestration in the oceans through acceleration of chemical rock weathering. This could be achieved by grinding rocks containing alkaline minerals and adding powder surface ocean where it dissolves chemically locks seawater as bicarbonate. However, during dissolution coincides with release potentially bio-active chemicals may induce side effects. Here, we used 53 L microcosms test how coastal plankton communities from Tasmania respond OAE olivine (mainly Mg₂SiO₄) or steel slag CaO Ca(OH)₂) sources. Three were left unperturbed served a control, three enriched (1.9 g L⁻¹), (0.038 L⁻¹). Phytoplankton zooplankton community responses well some biogeochemical parameters monitored for 21 days. Olivine additions increased total 29 µmol kg⁻¹ 361 respectively, which corresponds theoretical 0.9 % 14.8 storage capacity CO₂. released silicate nutrients into water column, but considerably more also significant amounts phosphate. Both dissolved aluminium (> 400 nmol The addition manganese concentrations (784 while nickel (38 treatment particulate (22 (5 was consistent these trace metals seawater. There no difference chlorophyll between treatments likely due nitrogen limitation phytoplankton community. flow cytometry results indicated an cellular abundance several smaller (~<20 µm) groups compared control. larger (~>20 decreased much control than mineral after day 10. Furthermore, maximum quantum yields photosystem II (F_v/F_m) higher treatments, suggesting that photosynthetic performance. composition affected most notable changes being observed dinoflagellate Noctiluca scintillans appendicularian Oikopleura sp. Overall, is efficient removal appears less when relating potential level environmental impact here.

Language: Английский

---

Reply on RC3

Published: Dec. 11, 2023

Abstract. Ocean alkalinity enhancement (OAE) aims to increase atmospheric CO₂ sequestration in the oceans through acceleration of chemical rock weathering. This could be achieved by grinding rocks containing alkaline minerals and adding powder surface ocean where it dissolves chemically locks seawater as bicarbonate. However, during dissolution coincides with release potentially bio-active chemicals may induce side effects. Here, we used 53 L microcosms test how coastal plankton communities from Tasmania respond OAE olivine (mainly Mg₂SiO₄) or steel slag CaO Ca(OH)₂) sources. Three were left unperturbed served a control, three enriched (1.9 g L⁻¹), (0.038 L⁻¹). Phytoplankton zooplankton community responses well some biogeochemical parameters monitored for 21 days. Olivine additions increased total 29 µmol kg⁻¹ 361 respectively, which corresponds theoretical 0.9 % 14.8 storage capacity CO₂. released silicate nutrients into water column, but considerably more also significant amounts phosphate. Both dissolved aluminium (> 400 nmol The addition manganese concentrations (784 while nickel (38 treatment particulate (22 (5 was consistent these trace metals seawater. There no difference chlorophyll between treatments likely due nitrogen limitation phytoplankton community. flow cytometry results indicated an cellular abundance several smaller (~<20 µm) groups compared control. larger (~>20 decreased much control than mineral after day 10. Furthermore, maximum quantum yields photosystem II (F_v/F_m) higher treatments, suggesting that photosynthetic performance. composition affected most notable changes being observed dinoflagellate Noctiluca scintillans appendicularian Oikopleura sp. Overall, is efficient removal appears less when relating potential level environmental impact here.

Language: Английский

---