Electrofishing gear in use, Rookery Branch, Shark River

This material is based upon work supported by the National Science Foundation through the Florida Coastal Everglades Long-Term Ecological Research program under Cooperative Agreements #DBI-0620409 and #DEB-9910514. This image is made available for non-commercial or educational use only.

Figuraciones de la esclavitud en novelas y ensayos antiesclavistas de Cuba y Brasil, 1840-1880

La tesis doctoral presentada da cuenta de las "figuraciones de la esclavitud" en un amplio corpus textual (ensayos y novelas) de autores representativos de la "narrativa antiesclavista" en el siglo XIX, centrada en las áreas de Cuba y Brasil. Desde una perspectiva comparativa, que atiende a los planos retóricos y discursivos, se analizan puntualmente novelas y ensayos de autores canónicos como Gertrudis Gómez de Avellaneda, Cirilo Villaverde, José Antonio Saco, Alejandro von Humboldt, José de Alencar, Bernardo Guimaraes, Joaquim Nabuco y Jean-Baptiste Debret. A la vez, se incorpora la plasmación de un enfoque interdisciplinar en el análisis de la "narrativa antiesclavista", abordando también aspectos que remiten a la historiografía política, social y económica sobre el proceso de la esclavitud en el período de 1840-1880, junto con otros de articulación antropológica, cultural y estética en ambas zonas mencionadas

Figuraciones de la esclavitud en novelas y ensayos antiesclavistas de Cuba y Brasil, 1840-1880

La tesis doctoral presentada da cuenta de las "figuraciones de la esclavitud" en un amplio corpus textual (ensayos y novelas) de autores representativos de la "narrativa antiesclavista" en el siglo XIX, centrada en las áreas de Cuba y Brasil. Desde una perspectiva comparativa, que atiende a los planos retóricos y discursivos, se analizan puntualmente novelas y ensayos de autores canónicos como Gertrudis Gómez de Avellaneda, Cirilo Villaverde, José Antonio Saco, Alejandro von Humboldt, José de Alencar, Bernardo Guimaraes, Joaquim Nabuco y Jean-Baptiste Debret. A la vez, se incorpora la plasmación de un enfoque interdisciplinar en el análisis de la "narrativa antiesclavista", abordando también aspectos que remiten a la historiografía política, social y económica sobre el proceso de la esclavitud en el período de 1840-1880, junto con otros de articulación antropológica, cultural y estética en ambas zonas mencionadas

Figuraciones de la esclavitud en novelas y ensayos antiesclavistas de Cuba y Brasil, 1840-1880

La tesis doctoral presentada da cuenta de las "figuraciones de la esclavitud" en un amplio corpus textual (ensayos y novelas) de autores representativos de la "narrativa antiesclavista" en el siglo XIX, centrada en las áreas de Cuba y Brasil. Desde una perspectiva comparativa, que atiende a los planos retóricos y discursivos, se analizan puntualmente novelas y ensayos de autores canónicos como Gertrudis Gómez de Avellaneda, Cirilo Villaverde, José Antonio Saco, Alejandro von Humboldt, José de Alencar, Bernardo Guimaraes, Joaquim Nabuco y Jean-Baptiste Debret. A la vez, se incorpora la plasmación de un enfoque interdisciplinar en el análisis de la "narrativa antiesclavista", abordando también aspectos que remiten a la historiografía política, social y económica sobre el proceso de la esclavitud en el período de 1840-1880, junto con otros de articulación antropológica, cultural y estética en ambas zonas mencionadas

Spring snowmelt and midwinter thaw and refreeze north of 60°N based on Seawinds QuikScat 2000-2009

The scatterometer SeaWinds on QuikSCAT provided regular measurements at Ku-band from 1999 to 2009. Although it was designed for ocean applications, it has been frequently used for the assessment of seasonal snowmelt patterns aside from other terrestrial applications such as ice cap monitoring, phenology and urban mapping. This paper discusses general data characteristics of SeaWinds and reviews relevant change detection algorithms. Depending on the complexity of the method, parameters such as long-term noise and multiple event analyses were incorporated. Temporal averaging is a commonly accepted preprocessing step with consideration of diurnal, multi-day or seasonal averages.

Reconstructions of eolian dust accumulation in northwest African margin sediments

Reconstructions of eolian dust accumulation in northwest African margin sediments provide important continuous records of past changes in atmospheric circulation and aridity in the region. Existing records indicate dramatic changes in North African dust emissions over the last 20 ka, but the limited spatial extent of these records and the lack of high-resolution flux data do not allow us to determine whether changes in dust deposition occurred with similar timing, magnitude and abruptness throughout northwest Africa. Here we present new records from a meridional transect of cores stretching from 31°N to 19°N along the northwest African margin. By combining grain size endmember modeling with 230Th-normalized fluxes for the first time, we are able to document spatial and temporal changes in dust deposition under the North African dust plume throughout the last 20 ka. Our results provide quantitative estimates of the magnitude of dust flux changes associated with Heinrich Stadial 1, the Younger Dryas, and the African Humid Period (AHP; ~11.7-5 ka), offering robust targets for model-based estimates of the climatic and biogeochemical impacts of past changes in North African dust emissions. Our data suggest that dust fluxes between 8 and 6 ka were a factor of ~5 lower than average fluxes during the last 2 ka. Using a simple model to estimate the effects of bioturbation on dust input signals, we find that our data are consistent with abrupt, synchronous changes in dust fluxes in all cores at the beginning and end of the AHP. The mean ages of these transitions are 11.8±0.2 ka (1Sigma) and 4.9±0.2 ka, respectively.

(Table 1) Sample locations and clay mineral data of sediment surface samples from the Barents Sea region

A new surface sediment sample set gained in the western Barents Sea by the MAREANO program has been analysed for basic clay mineral assemblages. Distribution maps including additional samples from earlier German research cruises to and off Svalbard are compiled. Some trends in the clay mineral assemblages are related to the sub-Barents Sea geology because the Quaternary sediment cover is rather thin. Additionally, land masses like Svalbard and northern Scandinavia dominate the clay mineral signal with their erosional products. Dense bottom water, very often of brine origin, that flows within deep troughs, such as the Storfjorden or Bear Island Trough, transport the clay mineral signal from their origin to the Norwegian-Greenland Sea.

Enviromagnetic, major element, and grain-size analyses of surface sediment samples along the continental margin between East Brazil and Patagonia

Continental margin sediments of SE South America originate from various terrestrial sources, each conveying specific magnetic and element signatures. Here, we aim to identify the sources and transport characteristics of shelf and slope sediments deposited between East Brazil and Patagonia (20°-48°S) using enviromagnetic, major element, and grain-size data. A set of five source-indicative parameters (i.e., chi-fd%, ARM/IRM, S0.3T, SIRM/Fe and Fe/K) of 25 surface samples (16-1805 m water depth) was analyzed by fuzzy c-means clustering and non-linear mapping to depict and unmix sediment-province characteristics. This multivariate approach yields three regionally coherent sediment provinces with petrologically and climatically distinct source regions. The southernmost province is entirely restricted to the slope off the Argentinean Pampas and has been identified as relict Andean-sourced sands with coarse unaltered magnetite. The direct transport to the slope was enabled by Rio Colorado and Rio Negro meltwaters during glacial and deglacial phases of low sea level. The adjacent shelf province consists of coastal loessoidal sands (highest hematite and goethite proportions) delivered from the Argentinean Pampas by wave erosion and westerly winds. The northernmost province includes the Plata mudbelt and Rio Grande Cone. It contains tropically weathered clayey silts from the La Plata Drainage Basin with pronounced proportions of fine magnetite, which were distributed up to ~24° S by the Brazilian Coastal Current and admixed to coarser relict sediments of Pampean loessoidal origin. Grain-size analyses of all samples showed that sediment fractionation during transport and deposition had little impact on magnetic and element source characteristics. This study corroborates the high potential of the chosen approach to access sediment origin in regions with contrasting sediment sources, complex transport dynamics, and large grain-size variability.

Understanding Media Production: A rejoinder to Murdock and Golding

This article is a rejoinder to Murdock and Golding’s response to my critique of the political economy of communications (PEC) analysis of media production (see Author 2015). This article sets this exchange in the context of a broader debate in recent editions of Media, Culture & Society (Garnham 2016, Fuchs, 2016) about the value of PEC. Much of this debate stems from Garnham’s (2011) critical review of 40 years of PEC research.