1861 : Juana Manuela Gorriti en la Revista del Paraná

En la Revista del Paraná -que dirige Vicente Quesada en año 1861-, Juana Manuela Gorriti publicó tres relatos que si bien presentan detalles inverosímiles, principalmente se caracterizan por contextualizar las tramas argumentativas en períodos de la historia argentina: las luchas de la independencia en "Güemes. Recuerdos de infancia" y episodios de la dictadura de Rosas en "El lucero del manantial" y "El guante negro". El objetivo del presente trabajo será analizar de qué modo los relatos de Gorriti contribuyen a consolidar el proyecto de la revista -que es el de formarun círculo literario nacional consagrado al estudio de nuestro país- y, al mismo tiempo, estudiar de qué manera esta incorporación tiende a consolidar su imagen de autora nacional, en tanto hija del gobernador salteño José Ignacio Gorriti y víctima de la dictadura de Juan Manuel de Rosas, es decir, como testigo privilegiado de la historia

Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect

Relict dune fields that are found as far south as 14° N in the modern-day African Sahel are testament to equatorward expansions of the Sahara desert during the Late Pleistocene. However, the discontinuous nature of dune records means that abrupt millennial-timescale climate events are not always resolved. High-resolution marine core studies have identified Heinrich stadials as the dustiest periods of the last glacial in West Africa although the spatial evolution of dust export on millennial timescales has so far not been investigated. We use the major-element composition of four high-resolution marine sediment cores to reconstruct the spatial extent of Saharan-dust versus river-sediment input to the continental margin from West Africa over the last 60 ka. This allows us to map the position of the sediment composition corresponding to the Sahara-Sahel boundary. Our records indicate that the Sahara-Sahel boundary reached its most southerly position (13° N) during Heinrich stadials and hence suggest that these were the periods when the sand dunes formed at 14° N on the continent. Heinrich stadials are associated with cold North Atlantic sea surface temperatures which appear to have triggered abrupt increases of aridity and wind strength in the Sahel. Our study illustrates the influence of the Atlantic meridional overturning circulation on the position of the Sahara-Sahel boundary and on global atmospheric dust loading.