Pollen records from two outcrop profiles in the Kakitu Mountain of Tibet

There is a great similarity between pollen types which occur in the early Holocene NE Tibetan pollen spectra and those which are commonly considered to be typical for the Würm Late Glacial period in Central Europe and for the Würm Pleniglacial period in Southern Europe. Evidently, this similarity is due to a remarkable general conformity of plant taxa growing in cold-arid regions of the northern hemisphere. The improvement of the climate and the retreat of the glaciers that commenced at the end of the Würm period had already terminated definitely before 9500 BP. In addition, the climatic situation as well as the vegetation belts must have remained rather constant during the following 3000 yr, i.e. through most parts of the climatic optimum of the Holocene.

Competencia y conflicto. Hesíodo y los consejos de administración familiar : Una lectura política del tópico

El proyecto del presente trabajo consiste en reflexionar sobre la constitución del sujeto ético-político en los Erga de Hesíodo. Trabajaremos desde una propuesta de matriz antropológica, en torno a los consejos de administración familiar que el poeta propone, recurriendo a Jenofonte cuando la comparación sea oportuna. Siguiendo el horizonte semántico del término chresis, indagaremos dos cuestiones fundamentales, la gestión del hogar, a partir de la problematización del matrimonio como cuestión afín, y la gestión de los vínculos personales, que van más allá del oikos, para convocar a otros actores, el hermano, el huésped, el amigo. En ambos niveles, el estrictamente familiar con la presencia del marido y la esposa en el centro de la escena, y el familiar, en sentido más amplio, los tópicos devuelven ciertas preocupaciones y reflexiones en torno a cuestiones que se repiten, el trabajo, la riqueza, la productividad, la prudencia, el honor, la convivencia, la tolerancia. Se plasma un universo antropológico que nos permite relevar, desde los topoi recortados, la pequeña familia intramuros y la gran familia extramuros, la preocupación habitual de la constitución de un sujeto temperante que en Hesíodo cobra distintas aristas. El modelo discursivo obedece a las reglas de formación que reconocemos en los Erga como matriz de discurso: recomendaciones, consejos, exhortaciones, que delinean dos topoi reconocibles, dos categorías de sujetos, dos registros de conductas, dos modelos de instalación en la vida. Hesíodo nos tiene acostumbrados a esos sistemas binarios que, a nuestro juicio, se inscriben en la lógica del linaje. Hombres, valores, conductas de matriz diurna o nocturna, positiva o negativa, luminosa o tenebrosa. La vida familiar y la comunitaria no parece escapar a esta lógica binaria y el corpus de consejos no hace otra cosa que vigorizar con su logos el aspecto diurno de la tensión

Monthly interpolated coral d18O records from Bonaire corals

Several proxy-based and modeling studies have investigated long-term changes in Caribbean climate during the Holocene, however, very little is known on its variability on short timescales. Here we reconstruct seasonality and interannual to multidecadal variability of sea surface hydrology of the southern Caribbean Sea by applying paired coral Sr/Ca and d18O measurements on fossil annually banded Diploria strigosa corals from Bonaire. This allows for better understanding of seasonal to multidecadal variability of the Caribbean hydrological cycle during the mid- to late Holocene. The monthly resolved coral Delta d18O records are used as a proxy for the oxygen isotopic composition of seawater (d18Osw) of the southern Caribbean Sea. Consistent with modern day conditions, annual d18Osw cycles reconstructed from three modern corals reveal that freshwater budget at the study site is influenced by both net precipitation and advection of tropical freshwater brought by wind-driven surface currents. In contrast, the annual d18Osw cycle reconstructed from a mid-Holocene coral indicates a sharp peak towards more negative values in summer, suggesting intense summer precipitation at 6 ka BP (before present). In line with this, our model simulations indicate that increased seasonality of the hydrological cycle at 6 ka BP results from enhanced precipitation in summertime. On interannual to multidecadal timescales, the systematic positive correlation observed between reconstructed sea surface temperature and salinity suggests that freshwater discharged from the Orinoco and Amazon rivers and transported into the Caribbean by wind-driven surface currents is a critical component influencing sea surface hydrology on these timescales.