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 Reforma Universitaria y la recepción de Eugenio d'Ors

La presente ponencia analiza la recepción argentina del filósofo catalán Eugenio d'Ors, que tuvo lugar durante la emergencia del movimiento de la Reforma Universitaria. La reconstrucción de las rutas y los actores intervinientes en esa recepción, así como de los intereses que guiaron la edición, la cita y la llegada de d'Ors a nuestro país, busca iluminar el proceso de apropiación de unas ideas pensadas en principio para otras latitudes que realizaron algunos grupos juveniles participantes de la Reforma

Tradición clásica y retórica en el Aprilis Dialogus de Vicente López. La construcción de un espacio de autoridad

En 1755 se publica como prólogo o presentación de la Bibliotheca Mexicana de Juan José de Eguiara y Eguren, el Aprilis Dialogus de Vicente López, en el que se ofrece una contribución explícita a la defensa literaria del valor intelectual de los americanos. La obra se caracteriza por la fuerte presencia de la tradición clásica representada por el uso del diálogo, las citas, el manejo de ciertas figuras retóricas y el tópico literario dellocus amoenus. El Aprilis Dialogue, que en una de sus digresiones consagra a la ciudad de México como ellocus amoenus de la erudición, es un aporte al proceso de construcción de un espacio de autoridad compuesto por elementos de la cultura clásica y americana