Hacendados, Cabildo y "corraleros" : El acceso de los hacendados al abasto de carne a partir del estudio de dos estancias de la campaña sur de Buenos Aires (1785-1809)

Algunas tradiciones historiográficas señalaban que el mercado colonial de abasto porteño era controlado por un grupo de hacendados en acuerdo con el Cabildo de Buenos Aires. La fijación de precios debía, por lo tanto, favorecer a los grandes hacendados en detrimento de una población. Sin embargo, a partir del estudio de las cuentas de una estancia, es posible demostrar que incluso grandes hacendados se encontraban subordinados a un mercado regulado donde el eje de una puja por el beneficio de transferencias de valor se situaba sobre todo entre el propio Cabildo y los "corraleros", comercializadores que conectaban la campaña con los corrales de Buenos Aires

Ice thickness measurements in the Lincoln Sea and adjacent Arctic Ocean

Results of helicopter-borne electromagnetic measurements of total (ice plus snow) sea-ice thickness performed in May 2004 and 2005 in the Lincoln Sea and adjacent Arctic Ocean up to 86° N are presented. Thickness distributions south of 84° N are dominated by multi-year ice with modal thicknesses of 3.9 m in 2004 and 4.2 m in 2005 (mean thicknesses 4.67 and 5.18 m, respectively). Modal and mean snow thickness on multi-year ice amounted to 0.18 and 0.30 m in 2004, and 0.28 and 0.35 m in 2005. There are also considerable amounts of 0.9-2.2 m thick first-year ice (modal thickness), mostly representing ice formed in the recurring, refrozen Lincoln Polynya. Results are in good agreement with ground-based electromagnetic thickness measurements and with ice types demarcated in satellite synthetic aperture radar imagery. Four drifting buoys deployed in 2004 between 86° N and 84.5° N show a similar pattern of a mean southward drift of the ice pack of 83 ± 18 km between May 2004 and April 2005, towards the coast of Ellesmere Island and Nares Strait. The resulting area decrease of 26% between the buoys and the coast is larger than the observed thickness increase south of 84° N. This points to the importance of shear in a narrow band along the coast, and of ice export through Nares Strait in removing ice from the study region.