@article{fdi:010095840,
  title = {{N}ew observations confirm the progressive acidification in the {M}ozambique {C}hannel},
  author = {{M}etzl, {N}. and {L}o {M}onaco, {C}. and {T}ribollet, {A}line and {T}ernon, {J}ean-{F}ran{\c{c}}ois and {C}hevallier, {F}. and {G}ehlen, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{N}ew observations obtained in 2021 and 2022 are presented and used to investigate the trend of the carbonate system (including p{H}({T}) and aragonite saturation state, {O}mega(ar)) in the southern sector of the {M}ozambique {C}hannel. {U}sing historical and new data in {A}pril-{M}ay we observed an acceleration of the acidification ranging from -0.012 decade(-1) in 1963-1995 to -0.027 (+/- 0.003) decade(-1) in 1995-2022. {R}esult from a neural network ({FFNN}) model for all seasons also suggests faster p{H} trend in recent decades, -0.011 decade(-1) over 1985-1995 and -0.018 decade(-1) over 1995-2022. {I}n {M}ay 2022 we estimated {O}mega(ar) of 3.49, about 0.3 lower than observed in {M}ay 1963 ({O}mega(ar)=3.86). {T}he lowest {O}mega(ar) value of 3.23 was evaluated from the {FFNN} model in {S}eptember 2023 that corresponds to the hypothetical critical threshold value (3.25) for coral reefs. {I}n 2025 a marine heat wave was observed in this region (sea surface temperature up to 30 degrees {C}) and data from a {BGC}-{A}rgo float indicate that sea surface p{H} was the lowest in {J}anuary 2025 (p{H}({T})=7.95) whereas {O}mega(ar) was the lowest in {M}arch 2025 ({O}mega(ar)=3.2). {A} projection of the {C}-{T} concentrations based on observed anthropogenic {CO}2 in subsurface water and future anthropogenic {CO}2 emissions scenario, suggests that a risky level for corals ({O}mega(ar)<3) could be reached as soon as year 2034.},
  keywords = {{OCEAN} {INDIEN} ; {MOZAMBIQUE} {CANAL}},
  booktitle = {},
  journal = {{B}iogeosciences},
  volume = {22},
  numero = {22},
  pages = {7187--7204},
  ISSN = {1726-4170},
  year = {2025},
  DOI = {10.5194/bg-22-7187-2025},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095840},
}