Tracking orbital and suborbital climate variability in the westernmost Mediterranean over the past 13,000 years: New insights from paleoperspectives on marine productivity responses
Metadatos
Mostrar el registro completo del ítemAutor
Monedero Contreras, Ricardo David; Martínez Ruiz, Francisca; Rodríguez Tovar, Francisco J.; Mesa Fernández, José Manuel; Sangiorgi, FrancescaEditorial
Elsevier
Materia
Paleoproductivity Dinoflagellates Mediterranean sea Barite
Fecha
2024-10-14Referencia bibliográfica
Monedero Contreras, R.D. et. al. Quaternary Science Reviews 3 44 (2024) 109001. [https://doi.org/10.1016/j.quascirev.2024.109001]
Patrocinador
Grants PID2019-104624RB-I00, PID2019-104625RB-100, and TED2021-131697B-C22 funded by MCIN/AEI/10.13039/501100011033; Grants FEDER/Junta de Andalucía P18-RT-3804 and P18-RT- 4074; Research Groups RNM- 179 and RNM-178 funded by the Junta de AndalucíaResumen
This study presents a comprehensive analysis of a sediment record from the Western Alboran Basin (core
GP04PC), utilizing palynological and geochemical tools to investigate marine productivity responses to orbital
and suborbital climate variability over the past 13,000 years. High productivity during the Younger Dryas humid
phase (~12.4–11.7 ka) and the Holocene humidity optimum (~10.5–8.5 ka) was driven by increased local river
discharges resulting from rapid mountain glaciers melting and enhanced regional precipitation. During the late
Holocene, frequent flood events linked to negative North Atlantic Oscillation (NAO) incursions potentially led to
multicentennial-scale productivity increases. The findings indicate that periods characterized by wet regional
conditions and increased river run-off, influenced by orbital (e.g., insolation cycles) and suborbital factors (e.g.,
NAO and Atlantic Meridional Overturning Circulation changes), consistently enhanced marine productivity in
the Western Alboran Basin. The study also reveals that the current high productivity and carbon export in the
Western Alboran Basin are maintained by active upwelling and downwelling systems driven by a persistent
positive NAO phase following the southward migration of the Intertropical Convergence Zone (ITCZ) that
occurred around 6.5 ka. Furthermore, geochemical proxies support a strong detrital influence on trace metal
concentrations, including barium (Ba), in deep Western Alboran sediments during the Holocene. This limits the
use of Ba/Al ratios for accurately reconstructing productivity changes and highlights the importance of dinocyst
analysis as a complementary tool for robust marine productivity reconstructions in this region. These observations
provide valuable paleoperspectives on marine ecosystem responses to climate variability, contributing to
the development of robust long-term productivity models essential for adapting to ongoing environmental
changes in the region, and demonstrating the strong influence of North Atlantic climate and ocean dynamics on
centennial-scale productivity oscillations in this region.