Organic matter C and N composition and N. pachyderma stable isotope ratios of ODP Hole 188-1166A sediments

We report the results of downhole stable isotopic (d13Corg [organic carbon] and d15N) and elemental measurements (total organic carbon [TOC], total nitrogen [TN], and carbon/nitrogen [C/N]) of sedimentary organic matter (SOM) along with stable isotopic measurements (d18O and d13C) of left-coiling Neogloboquadrina pachyderma planktonic foraminifers from Ocean Drilling Program Site 1166. TOC and TN measurements indicate a large change from organic-rich preglacial sediments with primary organic matter to organic-poor early glacial and glacial sediments, with mainly recycled organic matter. Results of the stable isotopic measurements of SOM show a range of values that are typical of both marine and terrestrial organic matter, probably reflecting a mixture of the two. However, C/N values are mostly high (>15), suggesting greater input and/or preservation of terrestrial organic matter. Foraminifers are only present in glacial/glaciomarine sediments of latest Pliocene to Pleistocene age at Site 1166 (lithostratigraphic Unit I). The majority of this unit has d13Corg and TOC values that are similar to those of glacial sediments recovered at Site 1167 (lithostratigraphic Unit II) on the slope and may have the same source(s). Although the low resolution of the N. pachyderma (s.) d18O and d13C data set precludes any specific paleoclimatic interpretation, downcore variations in foraminifer d18O and d13C values of 0.5 per mil to 1 per mil amplitude may indicate glacial-interglacial changes in ice volume/temperature in the Prydz Bay region.

Horizontal profiles of longwave and shortwave radiation components over sea ice near Barrow, Alaska during the 2011 melt

An integrated instrument package for measuring and understanding the surface radiation budget of sea ice is presented, along with results from its first deployment. The setup simultaneously measures broadband fluxes of upwelling and downwelling terrestrial and solar radiation (four components separately), spectral fluxes of incident and reflected solar radiation, and supporting data such as air temperature and humidity, surface temperature, and location (GPS), in addition to photographing the sky and observed surface during each measurement. The instruments are mounted on a small sled, allowing measurements of the radiation budget to be made at many locations in the study area to see the effect of small-scale surface processes on the large-scale radiation budget. Such observations have many applications, from calibration and validation of remote sensing products to improving our understanding of surface processes that affect atmosphere-snow-ice interactions and drive feedbacks, ultimately leading to the potential to improve climate modelling of ice-covered regions of the ocean. The photographs, spectral data, and other observations allow for improved analysis of the broadband data. An example of this is shown by using the observations made during a partly cloudy day, which show erratic variations due to passing clouds, and creating a careful estimate of what the radiation budget along the observed line would have been under uniform sky conditions, clear or overcast. Other data from the setup's first deployment, in June 2011 on fast ice near Point Barrow, Alaska, are also shown; these illustrate the rapid changes of the radiation budget during a cold period that led to refreezing and new snow well into the melt season.

La narrativa gay de Eduardo Mendicutti : la identidad literaria como espacio de reivindicación de la diversidad

El español Eduardo Mendicutti nos presenta una idea en la que la diversidad sexual y humana está presente más allá de las marcas genéricas y las presiones sociales y editoriales. La diversidad se convierte en lo hegemónico y sobre ella se construye el universo ficcional del autor. Mendicutti no realiza la crónica marginal de un mundo oscuro como se ha dicho en muchas críticas a sus novelas, sino que este autor nos presenta a la comunidad gay en todo su esplendor, con sus puntos oscuros y luminosos, con su heterogeneidad más enriquecedora, en definitiva, con su diversidad. ¿Qué está haciendo Eduardo Mendicutti en su obra narrativa? Es simple. Está creando un continuo de obras literarias, periodísticas, testimoniales, en las que su posición respecto a la sexualidad humana se condensa en una defensa de la heterogeneidad del mundo gay, es decir, en una defensa, pocas veces vista en la literatura, de la diversidad sexual humana en su sentido más amplio y plural.

Tras el abandono del silencio en la infancia

Fil: Nella, Jorge Daniel. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Contenidos subyacentes en la balada "The Three Ravens"

Fil: Montezanti, Miguel Angel. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Tras el abandono del silencio en la infancia

Fil: Nella, Jorge Daniel. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Contenidos subyacentes en la balada "The Three Ravens"

Fil: Montezanti, Miguel Angel. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.