Nava-Fernandez X. A. auteur aut IRD Machain-Castillo M. L. auteur aut IRD Sifeddine Abdelfettah auteur aut IRD Mendez-Millan Mercedes auteur aut IRD Caquineau Sandrine auteur aut IRD Gibson K. A. auteur aut IRD Tappa E. auteur aut IRD Ruiz-Fernandez A. C. auteur aut IRD Sanchez-Cabeza J. A. auteur aut IRD Rodriguez-Ramirez A. auteur aut IRD Lara-Cera A. R. auteur aut IRD text journalArticle eng text/pdf born digital access The impacts of El Nin similar to o 2015-2016 on planktonic foraminiferal assemblages and particle fluxes (total mass, organic carbon, total nitrogen, and carbonate) were analyzed in a sediment trap record located at the entrance of the Gulf of California from 2015 to 2019. Biweekly data of the sea surface temperature (SST) and sea surface chlorophyll-a (Chl-a) were obtained from satellite images (MODIS-AQUA) during this period. Particle fluxes and planktonic foraminiferal assemblages reflected the seasonal cycles of SST and phytoplankton biomass highlighting the effects of El Nin similar to o 2015-2016. During neutral and La Nin similar to a conditions, winter-spring upwelling leads to low SST, high Chl-a and particle fluxes, and an assemblage dominated by Globigerina bulloides while the summers are characterized by high SST, low Chl-a and particle fluxes, and a Globorotaloides hexagonus assemblage. In contrast, in normal summers, there is an alternation of G. bulloides and Orbulina universa-Trilobatus sacculifer-Globigerinella siphonifera associations. By late autumn under La Nin similar to a conditions, the Globigerinita glutinata assemblage reflects the transition from warm to cold conditions and the beginning of the upwelling season. This general pattern was affected by El Nin similar to o during 2015-2016. From late summer 2015 to early winter 2016 (El Nin similar to o 2015-2016 maximum intensity), Globigerinoides tenellus dominated, reflecting the intrusion of warm and oligotrophic equatorial waters. These results show the strong influence of El Nin similar to o Southern Oscillation (ENSO) on oceanic dynamics and planktonic foraminiferal assemblages at the entrance of the Gulf of California, and allow for a better interpretation of the preservation of these anomalous warm events in the sedimentary record, which can provide a better understanding of the long-term variations and effects of ENSO. specialized Particle fluxes Sediment trap Upwelling Eastern Tropical Pacific ENSO Seasonal cycles Primary productivity PACIFIQUE EST ZONE TROPICALE CALFORNIE GOLFE 032 036 208 102880 [12 p.] 2022 0079-6611 https://www.documentation.ird.fr/hor/fdi:010086389 10.1016/j.pocean.2022.102880 0079-6611 [F B010086389] https://www.documentation.ird.fr/hor/fdi:010086389 https://www.documentation.ird.fr/intranet/publi/2022-12/010086389.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2022-12-09 2025-02-24 fdi:010086389 fre