Ms.Ff.F.Stoltze 3. 160 - Brief von Wilhelm Kaulen an Friedrich Stoltze

Deutsche Latern: Abrechnung

Die Tobiaden und die Oniaden im II. Makkabäerbuche und in der verwandten jüdisch-hellenistischen Litteratur : Untersuchungen zur Geschichte der Juden von 220-160 und zur jüdisch-hellenistischen Litteratur

von Adolph Büchler

Nd isotope data for planktonic foraminifera from within and around sapropels S1 and S5 from ODP Site 160-967

The development of widespread anoxic conditions in the deep oceans is evidenced by the accumulation and preservation of organic-carbon-rich sediments, but its precise cause remains controversial. The two most popular hypotheses involve (1) circulation-induced increased stratification resulting in reduced oxygenation of deep waters or (2) enhanced productivity in the surface ocean, increasing the raining down of organic matter and overwhelming the oxic remineralization potential of the deep ocean. In the periodic development of deep-water anoxia in the Pliocene-Pleistocene Mediterranean Sea, increased riverine runoff has been implicated both as a source for nutrients that fuel enhanced photic-zone productivity and a source of a less dense freshwater cap leading to reduced circulation, basin-wide stagnation, and deep-water oxygen starvation. Monsoon-driven increases in Nile River discharge and increased regional precipitation due to enhanced westerly activity-two mechanisms that represent fundamentally different climatic driving forces-have both been suggested as causes of the altered freshwater balance. Here we present data that confirm a distinctive neodymium (Nd) isotope signature for the Nile River relative to the Eastern Mediterranean-providing a new tracer of enhanced Nile outflow into the Mediterranean in the past. We further present Nd isotope data for planktonic foraminifera that suggest a clear increase in Nile discharge during the central intense period of two recent anoxic events. Our data also suggest, however, that other regional freshwater sources were more important at the beginning and end of the anoxic events. Taken at face value, the data appear to imply a temporal link between peaks in Nile discharge and enhanced westerly activity.

Marsilio Ficino: Comentario al Banquete de Platón. (Traducción, estudio preliminar y notas de Adolfo Ruíz Díaz). 160 págs. Edición del Instituto de Literaturas Modernas de la Facultad de Filosofía y Letras de la Universidad Nacional de Cuyo. Mendoza, 1968.

Fil: Pró, Diego F..