@article{fdi:010095903,
  title = {{R}econstructing ocean-atmosphere interactions in {L}a {G}uajira upwelling system through organic and mineral proxies over the past 1800 years},
  author = {{R}odriguez-{B}urgos, {A}. {M}. and {B}riceño-{Z}uluaga, {F}. {J}. and {E}vangelista, {H}. and {F}lores-{A}queveque, {V}. and {N}ogueira, {J}. and {C}astillo, {A}. and {Q}uiroga-{C}amargo, {W}. {E}. and {M}endez-{M}illan, {M}ercedes and {S}ifeddine, {A}bdelfettah},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {C}aribbean upwelling system enhances the productivity of {N}orth {C}olombian coastal waters, supporting the trophic network and regional biodiversity. {D}espite knowledge of its mechanisms and drivers, {C}aribbean upwelling remains understudied, and its response to climate change is uncertain. {T}his study presents the first paleoclimatic reconstruction of upwelling in {L}a {G}uajira, {C}olombia (a climate-sensitive region) by analyzing environmental indicators from a marine sediment core ({GUACO}-4) collected off {B}ahia {H}ondita. {O}rganic matter proxies (total organic carbon, total nitrogen, delta 13{C}, delta 15{N}) were used to trace its origin and nutrient cycling, while mineral and metal compositions informed ocean-land interactions and thermal changes. {F}ive climatic phases were identified: the {R}oman {W}arm {P}eriod, the {D}ark {A}ges {C}old {P}eriod, the {M}edieval {C}limate {A}nomaly, the {L}ittle {I}ce {A}ge, and the {C}urrent {W}arm {P}eriod. delta 13{C} values (-21.5 to -19.7 %o) and {C}/{N} ratios (4.47-5.90) indicate a mainly marine origin of organic matter, and delta 15{N} values (4.24 to 5.58 %o) suggest active denitrification. {W}arm periods aligned with {E}l {N}ino-like conditions and stronger coupling between the {N}orth {A}tlantic {S}ubtropical {H}igh and the {I}ntertropical {C}onvergence {Z}one, intensifying the {C}aribbean {L}ow-{L}evel {J}et and enhancing productivity. {I}n contrast, during the {L}ittle {I}ce {A}ge, {L}a {N}ina-like conditions and system decoupling weakened the {J}et. {T}oday, increased variability adds uncertainty to future upwelling dynamics. {C}limate-driven changes in wind patterns could either strengthen or weaken upwelling. {T}his unpredictability could impact marine productivity, with potential consequences for fisheries and local communities that rely on these ecosystems.},
  keywords = {{L}ate {H}olocene ; {S}outhern {C}aribbean ; {M}arine productivity ; {C}limate-ocean coupling ; {S}ediment geochemistry ; {C}limate variability ; {COLOMBIE}, {LA} {GUAJIRA} ; {ATLANTIQUE} {NORD} ; {CARAIBES} {MER}},
  booktitle = {},
  journal = {{P}alaeogeography {P}alaeoclimatology {P}alaeoecology},
  volume = {682},
  numero = {},
  pages = {113461 [11 p.]},
  ISSN = {0031-0182},
  year = {2026},
  DOI = {10.1016/j.palaeo.2025.113461},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095903},
}