Middle Pleistocene sea surface temperature in the Brazil-Malvinas Confluence Zone: Paleoceanographic implications based on planktonic foraminifera

We reconstructed Middle Pleistocene surface hydrography in the western South Atlantic based on planktonic foraminiferal assemblages, modern analog technique and Globorotalia truncatulinoides isotopic ratios of core SP1251 (38 degrees 29.7`S / 53 degrees 40.7`W / 3400 m water depth). Biostratigraphic analysis suggests that sediments were deposited between 0.3 and 0.12 Ma and therefore correlate to Marine Isotopic Stage 6 or 8. Faunal assemblage-based winter and summer SST estimates suggest that the western South Atlantic at 38 degrees S was 4-6 degrees C colder than at present, within the expected range for a glacial interval. High relative abundances of subantarctic species, particularly the dominance of Neogloboquadrina pachyderma (left), support lower than present SSTs throughout the recorded period. The oxygen isotopic composition of G. truncatulinoides suggests a northward shift of the Brazil-Malvinas Confluence Zone and of the associated mid-latitude frontal system during this Middle Pleistocene cold period, and a stronger than present influence of superficial subantarctic waters and lowering in SSTs at our core site during the recorded Middle Pleistocene glacial.

Falkland Islands (Islas Malvinas) Hepaticae and Anthocerotophyta : a taxonomic and phytogeographic study / John J. Engel.

n.s. no.25(1990)

Chaetognatha of the Brazil-Malvinas (Falkland) confluence: distribution and associations

The planktonic chaetognaths from the Brazil-Malvinas (Falkland) confluence, extending between 36º 30' - 50º 5' S and 60º 33' - 41º 7' W, were studied. Ten species were found: Eukrohnia hamata (Möbius, 1875) (Eukrohniidae), Pterosagitta draco (Krohn, 1853) (Pterosagittidae), Sagitta enflata Grassi, 1881, Sagitta gazellae Ritter-Zahony, 1909, Sagitta hexaptera d´Orbigny, 1834, Sagitta lyra Krohn, 1853, Sagitta minima Grassi, 1881, Sagitta planctonis Steinhaus, 1896, Sagitta serratodentata Krohn, 1853, and Sagitta tasmanica Thomson, 1947 (Sagittidae). Sagitta gazellae was the most abundant species followed by E. hamata, S. tasmanica and S. serratodentata. The association analysis among the different species, salinity and temperature revealed two groups of species, one related to higher salinities and warmer waters (P. draco, S. hexaptera and S. serratodentata) and the other to lower salinities and colder waters (E. hamata, S. gazellae and S. tasmanica). The fact that P. draco and S. hexaptera, formerly defined as warm-water species, appeared further south than previously reported might be related to the existence of warm core eddies up to 46º S in September and October 1988.

Perfil sociodemográfico y estrategias de reproducción de la población migrante en dos comunidades pobres : el caso de Malvinas y Santa Lucía.

Tesis (Maestría en Trabajo Social) UANL

Estrategias que implementan las unidades domesticas en pobreza y pobreza extrema para obtener tierra, vivienda y servicios urbanos : un estudio de caso de las colonias las Malvinas y Santa Lucia, de Escobedo, N.L.

Tesis (Maestría en Trabajo Social) UANL

El trabajo de los menores como estrategia familiar para enfrentar la marginación y pobreza en las colonias urbanas de Santa Lucia y Malvinas de Monterrey, Nuevo León

Tesis (Maestria en Trabajo Social) UANL

El papel de los hijos en las estrategias económicas de sobrevivencia de las unidades domésticas en las colonias Malvinas y Santa Lucía [por] Patricia Navarro Montejano

Tesis (Maestría en Trabajo Social) U.A.N.L.

Análisis del conflicto de las Malvinas a la luz de la descolonización y el principio de determinación de los pueblos. Periodo 1982 - 2012

Esta monografía busca responder a la pregunta: ¿De qué manera el proceso de descolonización y el principio de determinación de los pueblos definen unos parámetros de actuación que mantienen latente el conflicto por las islas? A partir de lo anterior se determinan los elementos del proceso de colonización y descolonización inconclusa por los cuales se le otorgaría a Argentina el derecho sobre las Malvinas; se identifica en qué medida el principio de libre autodeterminación de los pueblos implica soberanía por parte de los británicos y se analiza su aplicabilidad, mostrando así una contradicción y prevalencia de la autodeterminación sobre el proceso de descolonización que reclama Argentina, situación que mantiene el conflicto sin resolver. Para entender este complejo proceso de relaciones internacionales, no basta con las teorías racionalistas que aunque permiten otros niveles de análisis no logra el entendimiento del proceso de conflicto por la soberanía de las islas Malvinas. Mientras que, el enfoque constructivista se va a centrar en el proceso que va a permitir un estudio de la interacción recíproca de los agentes para determinar la construcción de identidad que puede ser positiva o negativa la cual genera una determinada cultura de anarquía, que, para el caso de Malvinas, es de tipo conflictiva, es decir, Hobbesiana.

Multiyear measurements of the oceanic and atmospheric boundary layers at the Brazil-Malvinas confluence region

This study analyzes and discusses data taken from oceanic and atmospheric measurements performed simultaneously at the Brazil-Malvinas Confluence (BMC) region in the southwestern Atlantic Ocean. This area is one of the most dynamical frontal regions of the world ocean. Data were collected during four research cruises in the region once a year in consecutive years between 2004 and 2007. Very few studies have addressed the importance of studying the air-sea coupling at the BMC region. Lateral temperature gradients at the study region were as high as 0.3 degrees C km(-1) at the surface and subsurface. In the oceanic boundary layer, the vertical temperature gradient reached 0.08 degrees C m(-1) at 500 m depth. Our results show that the marine atmospheric boundary layer (MABL) at the BMC region is modulated by the strong sea surface temperature (SST) gradients present at the sea surface. The mean MABL structure is thicker over the warmside of the BMC where Brazil Current (BC) waters predominate. The opposite occurs over the coldside of the confluence where waters from the Malvinas (Falkland) Current (MC) are found. The warmside of the confluence presented systematically higher MABL top height compared to the coldside. This type of modulation at the synoptic scale is consistent to what happens in other frontal regions of the world ocean, where the MABL adjusts itself to modifications along the SST gradients. Over warm waters at the BMC region, the MABL static instability and turbulence were increased while winds at the lower portion of the MABL were strong. Over the coldside of the BC/MC front an opposite behavior is found: the MABL is thinner and more stable. Our results suggest that the sea-level pressure (SLP) was also modulated locally, together with static stability vertical mixing mechanism, by the surface condition during all cruises. SST gradients at the BMC region modulate the synoptic atmospheric pressure gradient. Postfrontal and prefrontal conditions produce opposite thermal advections in the MABL that lead to different pressure intensification patterns across the confluence.

Use of recent geoid models to estimate mean dynamic topography and geostrophic currents in South Atlantic and Brazil Malvinas confluence

The use of geoid models to estimate the Mean Dynamic Topography was stimulated with the launching of the GRACE satellite system, since its models present unprecedented precision and space-time resolution. In the present study, besides the DNSC08 mean sea level model, the following geoid models were used with the objective of computing the MDTs: EGM96, EIGEN-5C and EGM2008. In the method adopted, geostrophic currents for the South Atlantic were computed based on the MDTs. In this study it was found that the degree and order of the geoid models affect the determination of TDM and currents directly. The presence of noise in the MDT requires the use of efficient filtering techniques, such as the filter based on Singular Spectrum Analysis, which presents significant advantages in relation to conventional filters. Geostrophic currents resulting from geoid models were compared with the HYCOM hydrodynamic numerical model. In conclusion, results show that MDTs and respective geostrophic currents calculated with EIGEN-5C and EGM2008 models are similar to the results of the numerical model, especially regarding the main large scale features such as boundary currents and the retroflection at the Brazil-Malvinas Confluence.

Use of recent geoid models to estimate mean dynamic topography and geostrophic currents in South Atlantic and Brazil Malvinas confluence

The use of geoid models to estimate the Mean Dynamic Topography was stimulated with the launching of the GRACE satellite system, since its models present unprecedented precision and space-time resolution. In the present study, besides the DNSC08 mean sea level model, the following geoid models were used with the objective of computing the MDTs: EGM96, EIGEN-5C and EGM2008. In the method adopted, geostrophic currents for the South Atlantic were computed based on the MDTs. In this study it was found that the degree and order of the geoid models affect the determination of TDM and currents directly. The presence of noise in the MDT requires the use of efficient filtering techniques, such as the filter based on Singular Spectrum Analysis, which presents significant advantages in relation to conventional filters. Geostrophic currents resulting from geoid models were compared with the HYCOM hydrodynamic numerical model. In conclusion, results show that MDTs and respective geostrophic currents calculated with EIGEN-5C and EGM2008 models are similar to the results of the numerical model, especially regarding the main large scale features such as boundary currents and the retroflection at the Brazil-Malvinas Confluence.

Variação do espectro das ondas de Rossby na região da frente Brasil-Malvinas

A média global da variação na quantidade de calor armazenado nos oceanos observada recentemente é positiva (Cabanes et al., 2001; Cazenave & Nerem, 2004), porém, sua distribuição espacial não é homogênea (Polito & Sato, 2008). O calor armazenado está associado, via expansão térmica, à altura da coluna d'água. Portanto, variações espaciais na tendência do calor armazenado tem como consequência mudanças na inclinação da superfície que, por sua vez, implicam em variações nas correntes geostróficas e portanto na energia cinética associada a fenômenos de meso e larga escala. Polito & Sato (2008) observaram tendências predominantemente positivas na amplitude de ondas de Rossby e vórtices de mesoescala nos últimos 13 anos, sugerindo que estes eventos estão, em uma média global, ficando mais energéticos. Estas tendências variam regionalmente e a variabilidade espacial é mais pronunciada próximo da extensão para leste das correntes de contorno oeste (CCO), sugerindo um aumento do cisalhamento da velocidade geostrófica. O afastamento das CCO da costa provoca, na região de sua ocorrência, intensa atividade vortical e meandramento, constituindo, do ponto de vista da anomalia da altura da superfície do mar (AASM), as áreas mais energéticas do planeta. O exemplo no Atlântico Sul é a separação da Corrente do Brasil (CB) em sua região de encontro com a Corrente das Malvinas (CM). A CB flui quase-meridionalmente para sul até aproximadamente 36°S, iniciando seu afastamento da costa até 38°S devido ao encontro de suas águas quentes e salinas com as águas de origem subpolar da CM, conforme Garzoli & Garrafo (1989). Essa região recebe o nome de Confluência Brasil-Malvinas (CBM).

Efectos psicosociales y sociopolíticos de la Guerra de Malvinas en las provincias de Chaco y Corrientes, 1982 →. 16H241

El proyecto plantea un estudio psicosocial y antropológico del impacto que tuvo la Guerra de Malvinas sobre la política y la identidad de la población de las provincias de Chaco y Corrientes, región desde la que se movilizó un nutrido contingente de soldados hacia el frente de guerra. El periodo a investigar abarca desde el acontecimiento en 1982 hasta nuestros días y pone la mirada sobre los protagonistas del momento: soldados, gobernantes, dirigentes y activistas sociales, y sobre las generaciones posteriores al hecho que lo conocen a partir de la memoria transmitida. El tema es abordado a través de la investigación documental y de entrevistas en profundidad. Constituye una etapa en el desarrollo de la línea de investigación sobre la Guerra de Malvinas en la región del nordeste argentino que se inició en el año 2004, por lo cual contamos con resultados que nos permiten reorientar la investigación hacia distintos aspectos de los efectos del acontecimiento en la sociedad. Este avance nos permite un mayor acercamiento con las organizaciones de ex combatientes que desarrollan su actividad en ambas provincias.

Valor estratégico de las Islas Malvinas en la distribución de poder a principios del siglo XXI

El propósito del presente trabajo es contribuir a una demanda histórica de la conciencia nacional argentina. El estudio, el debate, la información (y su difusión) de todo lo que tenga que ver con las Islas Malvinas resulta crucial para establecer una estrategia política y diplomática tendiente a lograr hacer uso de la soberanía sobre las islas, frenar la ilegítima e ilegal exploración y explotación de recursos naturales y eliminar la permanente amenaza militar que la ocupación representa sobre todo el continente. Por esto es que la Argentina no está sola en este camino y la solidaridad de la región resulta un elemento fundamental en la denuncia de la violación sistemática británica a la soberanía argentina y a la voluntad internacional.

Decir el acontecimiento límite : Dos ficciones sobre Malvinas

En este trabajo nos proponemos indagar las relaciones que se establecen entre discurso histórico y discurso ficcional en la representación de acontecimientos extremos del pasado reciente. Para ello, analizaremos -a partir, fundamentalmente, de los aportes de Paul Ricoeur y Dominick LaCapra- dos novelas que ficcionalizan la guerra de Malvinas y que fueron escritas en los ?80: A sus plantas rendido un león, de Osvaldo Soriano, y Arde aún sobre los años, de Fernando López. A partir del análisis se pretende reflexionar acerca de algunas de las diferentes posibilidades que tiene la literatura para representar un acontecimiento límite: el humor y la parodia, en el caso de A sus plantas rendido un león, y la configuración de una narrativa redentora, en el caso de Arde aún sobre los años