188 research outputs found

    Economic trends in Central America

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    Los desafíos de la globalización para Centroamérica

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    Incluye Bibliografí

    La crisis financiera y económica de 2008 y su repercusión en el pensamiento económico

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    Incluye BibliografíaLa crisis financiera y económica de 2008 tuvo múltiplesconsecuencias en los países de América Latina y el Caribe. Trastocóel desempeño de las economías y puso en duda paradigmas quehabían orientado la política económica en la mayoría de los países.Asimismo, exacerbó crecientes divergencias entre puntos de vistasurgidos incluso antes de la crisis. Algunas de esas divergencias sonde carácter ideológico, pero otras obedecen a enfoques antagónicossobre estrategias económicas. Entre los factores de diferenciación seencuentran, primero, el papel del Estado y su relación con el mercado, ysegundo, la naturaleza y alcance de la inserción en la economía global.Aquí se abordan algunos de los rasgos de diferenciación, las tensionesque generan y el futuro que deparan para la cooperación dentro deAmérica Latina. También se señala que en este nuevo escenario,marcado por cierta perplejidad, se abren espacios inherentes al trabajode la CEPAL

    Los procesos de integración regional y las políticas sociales

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    Temperature calibration of Mg/Ca ratios in the intermediate water benthic foraminifer Hyalinea balthica

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    Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 12 (2011): Q04003, doi:10.1029/2010GC003333.Core top samples from Indonesian and northeast Atlantic depth transects were used to calibrate Mg/Ca and δ18O in tests of the calcitic benthic foraminifer Hyalinea balthica to bottom water temperature between 4°C and 13°C. This shallow infaunal species is primarily abundant in neritic to upper bathyal sediments (<600 m). Both linear and exponential calibrations suggest a temperature sensitivity of ~12% per °C that is ~4 times higher than observed in other species of deep-sea benthic foraminifera. Culture experiments support the core top calibration. We find no discernible effect of salinity and saturation on Mg/Ca. Comparison between the measured benthic foraminiferal δ18O and predicted equilibrium values suggests that on average H. balthica δ18O is 0.64‰ ± 0.13‰ lower than predicted from the equilibrium composition. To test the reliability of using paired H. balthica Mg/Ca and δ18O measurements for reconstructing seawater δ18Osw and salinity, we apply this calibration to another depth transect from Cape Ghir off NW Africa, which was not included in the calibration. Based on error analysis of the calibration data and this validation test, we show that the uncertainty of reconstructing bottom water temperature and salinity from paired Mg/Ca and δ18O measurements of H. balthica is better than ±0.7°C and ±0.69 practical salinity scale, respectively. The small uncertainties allow for the reconstruction of seawater density to better than 0.3σθ units, which is precise enough for the identification of specific water masses and reconstruction of changes in their properties. We propose that the relatively high Mg content and temperature sensitivity of H. balthica might be due to minor, biologically mediated contribution of high-Mg calcite to the primarily low Mg calcite test, which is influenced by the ambient temperature. This hypothesis, if correct, suggests that benthic species with relatively high Mg/Ca may be better suited for deepwater temperature reconstructions than species that have thus far been more commonly used.This project was funded by NSF Awards OCE 02‐20922 and 09‐02977 to YR, OCE 09‐28607 to MK, OCE02‐20776 to DWO, and DFG priority program INTERDYNAMIK to AM
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