@article{fdi:010092751,
  title = {{C}ontrasting trends of the ocean {CO}2 sink and p{H} in the {A}gulhas current system and the {M}ozambique basin, south-western {I}ndian ocean (1963-2023)},
  author = {{M}etzl, {N}. and {L}o {M}onaco, {C}. and {B}arut, {G}. and {T}ernon, {J}ean-{F}ran{\c{c}}ois},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e describe new observations of the oceanic carbonate system in the {S}outh-{W}estern {I}ndian {O}cean obtained in {J}anuary 2021 ({OISO}-31 cruise) and {M}ay 2022 ({RESILIENCE} cruise). {T}o evaluate the decadal trends and drivers of fugacity of {CO}2 (f{CO}2), air-sea {CO}2 fluxes, dissolved inorganic carbon ({CT}) and p{H}, we used available data in this region over 1963-2023 and compared the results in the {M}ozambique {B}asin and in the {A}gulhas region near the {A}frican coast. {O}ver 1995-2023, we found a faster f{CO}2 increase in the {M}ozambique basin (2.03 f 0.07 mu atm. yr- 1) compared to the coastal zone (1.37 f 0.07 mu atm.yr- 1). {T}he temporal change of anthropogenic {CO}2 concentrations estimated in subsurface enables to reconstruct the carbonate system properties since the 1960s. {I}n the {M}ozambique {B}asin the {CO}2 sink increased slightly over 1960-2022 with a maximum observed in {M}ay 2022 (-2.4 mmol{C}.m- 2.d- 1). {I}n the coastal zone, the ocean {CO}2 sink increased from near equilibrium in the 1960s to a maximum observed in {M}ay 2022 (-4.2 mmol{C}.m- 2.d- 1). {I}n both regions, we found a decrease of p{H}, most pronounced in the open ocean zone (-0.020 f 0.001.decade- 1 over 1995-2023). {T}he lowest p{H} of 8.04 was observed in {J}anuary 2021, 0.11 lower than in the 1960s. {T}he increase of the {CO}2 sink and the decrease of p{H} were mainly driven by anthropogenic {CO}2 uptake, with about 10% due to the ocean warming.},
  keywords = {{A}ir-sea {CO}2 fluxes ; {O}cean acidification ; {I}ndian ocean ; {M}ozambique basin ; {A}gulhas current ; {OCEAN} {INDIEN} ; {MOZAMBIQUE} {BASSIN} ; {AIGUILLES} {COURANT}},
  booktitle = {},
  journal = {{D}eep-{S}ea {R}esearch {P}art {II} : {T}opical {S}tudies in {O}ceanography},
  volume = {220},
  numero = {},
  pages = {105459 [13 p.]},
  ISSN = {0967-0645},
  year = {2025},
  DOI = {10.1016/j.dsr2.2025.105459},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092751},
}