(Table 1) Iceberg characteristics and start and end date and location of iceberg buoys in the Weddell Sea

The drift of 52 icebergs tagged with GPS buoys in the Weddell Sea since 1999 has been investigated with respect to prevalent drift tracks, sea ice/iceberg interaction, and freshwater fluxes. Buoys were deployed on small- to medium-sized icebergs (edge lengths ? 5 km) in the southwestern and eastern Weddell Sea. The basin-scale iceberg drift of this size class was established. In the western Weddell Sea, icebergs followed a northward course with little deviation and mean daily drift rates up to 9.5 ± 7.3 km/d. To the west of 40°W the drift of iceberg and sea ice was coherent. In the highly consolidated perennial sea ice cover of 95% the sea ice exerted a steering influence on the icebergs and was thus responsible for the coherence of the drift tracks. The northward drift of buoys to the east of 40°W was interrupted by large deviations due to the passage of low-pressure systems. Mean daily drift rates in this area were 11.5 ± 7.2 km/d. A lower threshold of 86% sea ice concentration for coherent sea ice/iceberg movement was determined by examining the sea ice concentration derived from Special Sensor Microwave Imager (SSM/I) and Advanced Microwave Scanning Radiometer for EOS (AMSR-E) satellite data. The length scale of coherent movement was estimated to be at least 200 km, about half the value found for the Arctic Ocean but twice as large as previously suggested. The freshwater fluxes estimated from three iceberg export scenarios deduced from the iceberg drift pattern were highly variable. Assuming a transit time in the Weddell Sea of 1 year, the iceberg meltwater input of 31 Gt which is about a third of the basal meltwater input from the Filchner Ronne Ice Shelf but spreads across the entire Weddell Sea. Iceberg meltwater export of 14.2 × 103 m3 s?1, if all icebergs are exported, is in the lower range of freshwater export by sea ice.

El mito revisitado en The World doesn't end, de Charles Simic

Este artículo realiza un acercamiento al libro de poemas en prosa The World Doesn’t End, del poeta serbio-norteamericano Charles Simic. En el poemario se advierten dos rasgos fundamentales que contribuyen a configurar la visión del mundo que Simic desarrolla a lo largo de su extensa producción: por un lado, la creación de un universo de ribetes surrealistas y, por otro, una nostalgia por el pasado como tiempo perdido, recuperable solamente a través de la imaginación. The World Doesn’t End, publicado en Estados Unidos en 1990, fue traducido al español por Mario Lucarda en España, y ha llegado nuestro país solamente mediante versiones de algunos de los poemas en prosa en publicaciones periódicas. Es por eso que se propone, al final del artículo, una breve selección de textos traducidos al español, para contribuir a la difusión de este autor que manifiesta, con su obra, una de las múltiples voces de la poesía norteamericana contemporánea.

Ward-Perkins, B., The fall of Rome and the end of civilization, Oxford University Press, Oxford, 2005, 239 páginas

Fil: Sarachu, Pablo. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Ward-Perkins, B., The fall of Rome and the end of civilization, Oxford University Press, Oxford, 2005, 239 páginas

Fil: Sarachu, Pablo. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Ward-Perkins, B., The fall of Rome and the end of civilization, Oxford University Press, Oxford, 2005, 239 páginas

Fil: Sarachu, Pablo. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Cretaceous-Tertiary ichthyoliths of brown clay intervals

The pattern of ichthyolith distribution established in sequences with stratigraphies based on calcareous or siliceous microfossils is used to provide age correlations for three deep-sea pelagic clay intervals that lack the better known microfossils. At Site 637, approximately 25 m of brown clay in Cores 103-637A-21R through 103-637A-23R underlies upper Miocene sediments and is of Paleocene to early Eocene age. At Site 639, 1.7 m of brown clay in Core 103-639C-2R is Eocene to Oligocene. At Site 640, 3.5 m of clay in Cores 103-640A-1R and 103-640A-2R contains a Cretaceous to Paleocene sequence, with the Cretaceous/Tertiary boundary between 84 and 103 cm in Section 103-640A-2R-1.