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Fuente de humedad mediterránea para un período húmedo del Holoceno temprano en el norte del Mar Rojo
Helge W Arz1, Frank Lamy, Jurgen Pätzold
1Deutsche Forschungsgemeinschaft (DFG) Research Center for Ocean Margins, University of Bremen, Klagenfurter Strasse, 28359 Bremen, Germany. helge.arz@uni-bremen.de
Science (New York, N.Y.)
|April 5, 2003
Resumen
Los núcleos de sedimentos del Mar Rojo del Holoceno temprano revelan un período húmedo con menor salinidad y mayor escurrimiento fluvial, lo que indica mayores precipitaciones. Esto sugiere que las precipitaciones mediterráneas, no africanas, influyeron en la región, y los monzones no llegaron a esta área.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Geología marina Geología marina.
- Dinámica del clima del Holoceno Dinámica del clima del Holoceno
Sus antecedentes:
- Comprender los cambios hidrológicos del Holoceno es crucial para la investigación del cambio climático.
- La región más septentrional del Mar Rojo es sensible a los cambios en las influencias climáticas mediterráneas.
- La reconstrucción de los patrones de lluvia del pasado ayuda a validar los modelos climáticos.
Objetivo del estudio:
- Para reconstruir la paleosalinidad y la entrada de sedimentos terrígenos en el norte del Mar Rojo.
- Para inferir cambios hidrológicos en el margen sur de la zona climática mediterránea durante el Holoceno.
- Determinar las fuentes del aumento de la humedad durante el Holoceno temprano.
Principales métodos:
- Análisis de dos núcleos de sedimentos del extremo norte del Mar Rojo.
- Reconstrucción de la paleosalinidad utilizando proxies geoquímicos.
- Cuantificación de la entrada de sedimentos terrígenos para inferir la actividad fluvial.
Principales resultados:
- Un intervalo húmedo ocurrió entre hace aproximadamente 9.25 y 7.25 mil años.
- Este intervalo se caracterizó por una reducción de ~3 por mil en la salinidad del agua superficial.
- El aumento de la entrada de sedimentos fluviales indicó precipitaciones sustancialmente más altas y escurrimiento de agua dulce, disminuyendo a los valores modernos a partir de entonces.
Conclusiones:
- El intervalo húmedo del norte del Mar Rojo resultó de lluvias mejoradas y extendidas hacia el sur de fuentes mediterráneas.
- Los patrones de oscilación ártica del Holoceno temprano pueden haber contribuido a este fenómeno.
- Las lluvias monzónicas afroasiáticas no se extendieron a través de la zona desértica subtropical para llegar al norte del Mar Rojo durante el Holoceno temprano y medio.
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