@article{fdi:010093570,
  title = {{A}dvancing knowledge on the paleoproductivity and climate in the {G}uaymas {B}asin, {G}ulf of {C}alifornia, over the past 31,200 years : geochemical proxies in {IODP} expedition 385 sediments},
  author = {{A}ldama-{C}ervantes, {A}. and {P}erez-{C}ruz, {L}. and {U}rrutia-{F}ucugauchi, {J}. and {M}onreal-{G}ómez, {M}. {A}. and {M}erino-{I}barra, {M}. and {V}elázquez-{A}guilar, {M}. and {V}enegas-{F}errer, {R}. and {S}anchez-{C}abeza, {J}. {A}. and {S}ifeddine, {A}bdelfettah and {H}{\¨o}fig, {T}. {W}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {G}uaymas {B}asin ({GB}) is a highly productive region in the {G}ulf of {C}alifornia. {S}ubseafloor sedimentary amorphous bio-opal and {B}a/{T}i records obtained from its northwestern and central areas reveal significant changes in exported productivity over the past 31,200 years. {M}illennial-scale variability reflects the influence of wind-driven upwelling, mesoscale eddies, and shifts in climate variability operating at orbital, millennial, and centennial timescales. {S}patial heterogeneity in productivity recorded in {I}nternational {O}cean {D}iscovery {P}rogram boreholes highlights regional differences in process dominance. {W}e identify seven distinct productivity phases: {F}rom similar to 31,200 to similar to 26,500 cal yr {BP}, laminated sediments indicate strong seasonal variability and high productivity due to intense upwelling activity caused by northwesterly winds linked to a southward-shifted {I}ntertropical {C}onvergence {Z}one. {T}he {L}ast {G}lacial {M}aximum, from similar to 26,500 to similar to 19,000 cal yr {BP}., displayed pronounced fluctuations and a slight decline in productivity compared to the previous interval, owing to the reduced influence of the {N}orth {P}acific {H}igh on the {GB} during this period. {F}rom similar to 19,000 to similar to 11,700 cal yr {BP}, there were shifts of high and low productivity, with opal minima coinciding with {H}einrich events 2 and 1, as well as the {Y}ounger {D}ryas. {P}roductivity declined slightly between similar to 11,700 and similar to 7,000 cal yr {BP}, featuring a short high-productivity period within that timespan (similar to 10,500 to similar to 10,300 cal yr {BP}). {F}rom similar to 7,000 to similar to 4,200 cal yr {BP}, productivity decreased in the {NW} and increased in the central basin. {T}his contrast reflects enhanced winter-spring coastal wind-driven upwellings and reduced eddy activity in the west. {F}rom similar to 4,200 to similar to 130 cal yr {BP}, productivity increased in both studied areas. {T}he sedimentary {B}a/{T}i values in both holes generally indicate lower levels during the cold glacial period and higher levels during the warm interglacial period, suggesting reduced biological barite accumulation and less organic matter export from the surface under cold climate conditions. {T}hese changes correspond to documented climate transitions, highlighting {GB}'s sensitivity to global forcings (e.g., ice sheet retreat) and regional ocean-atmosphere interactions. {O}ur findings underscore the key role of dynamic physical processes in shaping long-term productivity patterns in marginal seas at high resolution.},
  keywords = {biogenic opal ; {B}a/{T}i ; wind-driven upwellings ; mesoscale eddies ; eastern ; tropical north pacific ocean ; climate ; {ZONE} {TROPICALE} ; {PACIFIQUE} {NORD} ; {CALIFORNIE} {GOLFE} ; {GUAYMAS} {BASSIN}},
  booktitle = {},
  journal = {{F}rontiers in {E}arth {S}cience},
  volume = {13},
  numero = {},
  pages = {1568130 [14 ]},
  year = {2025},
  DOI = {10.3389/feart.2025.1568130},
  URL = {https://www.documentation.ird.fr/hor/fdi:010093570},
}