@article{fdi:010093592,
  title = {{E}xpanded composite coral indices of {S}outh {P}acific {C}onvergence {Z}one oceanographic variability since 1848 {CE}},
  author = {{T}odorovic, {S}. and {L}insley, {B}. {K}. and {K}uhnert, {H}. and {D}issard, {D}elphine and {M}enk{\`e}s, {C}hristophe and {W}u, {H}. {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the {S}outh {P}acific {C}onvergence {Z}one ({SPCZ}), interannual to interdecadal oceanic and atmospheric variability is especially pronounced. {T}he {E}l {N}iño {S}outhern {O}scillation and the {I}nterdecadal {P}acific {O}scillation significantly influence the {SPCZ} diagonal axis and salinity front. {R}egional coral-based paleo-environmental reconstructions extend the relatively short and discontinuous instrumental sea surface temperature ({SST}) and sea surface salinity ({SSS}) record to elucidate past variability. {W}e present monthly resolved, composite indices of coral skeletal delta 18{O}, {S}r/{C}a, and calculated delta 18{O}sw utilizing coral geochemical time-series from {R}otuma, {F}iji, {T}onga, and {R}arotonga, dubbed the {SPCZ}coral ({SPCZ}c) indices. {T}he new indices build upon previous efforts to describe variability and trends in the {SPCZ} region with expanded coverage due to a new northwestern coral addition from the {SPCZ} fresh pool. {T}he increased spatial and temporal resolution of the new indices allows for higher-fidelity sub-annual reconstructions of {SST} and {SSS} in the region dating back to 1848. {T}he results confirm the secular warming trend of 1 degrees {C} in the {SPCZ} region and show a 0.4 {S}p freshening starting in the 1880s. {T}he {SPCZ}c delta 18{O}sw is the first regional reconstruction of delta 18{O}sw and provides valuable insights into past {SSS} variability, including elucidating responses to {E}l {N}iño and {L}a {N}iña events, as well as identifying past {SPCZ} zonal events. {T}he {SPCZ}c delta 18{O}sw reconstruction extends the instrumental records by similar to 100 years. {T}he {SPCZ}c indices prove the utility of the compositing approach in describing regional oceanographic variability with the increased signal-to-noise ratio of the obtained coral climatic data.},
  keywords = {climate indices ; reconstruction ; {SPCZ} ; composite ; coral ; {PACIFIQUE} {SUD}},
  booktitle = {},
  journal = {{P}aleoceanography and {P}aleoclimatology},
  volume = {40},
  numero = {5},
  pages = {e2025{PA}005108 [17 p.]},
  ISSN = {2572-4517},
  year = {2025},
  DOI = {10.1029/2025pa005108},
  URL = {https://www.documentation.ird.fr/hor/fdi:010093592},
}