Sea surface temperature calculated from UK37 and UK'37 in the Pacific sector of the Southern Ocean

In spite of the important role played by the Southern Ocean in global climate, the few existing paleoceanographic records in the east Pacific sector do not extend beyond one glacial-interglacial cycle, hindering circumpolar comparison of past sea surface temperature (SST) evolution in the Southern Ocean. Here we present three alkenone-based Pleistocene SST records from the subantarctic and subtropical Pacific. We use a regional core top calibration data set to constrain the choice of calibrations for paleo SST estimation. Our core top data confirm that the alkenone-based UK37 and UK'37 values correlate linearly with the SST, in a similar fashion as the most commonly used laboratory culture-based calibrations even at low temperatures (down to ~1°C), rendering these calibrations appropriate for application in the subantarctic Pacific. However, these alkenone indices yield diverging temporal trends in the Pleistocene SST records. On the basis of the better agreement with d18O records and other SST records in the subantarctic Southern Ocean, we propose that the UK37 is a better index for SST reconstruction in this region than the more commonly used UK'37 index. The UK37-derived SST records suggest glacial cooling of ~8°C and ~4°C in the subantarctic and subtropical Pacific, respectively. Such extent of subantarctic glacial cooling is comparable to that in other sectors of the Southern Ocean, indicating a uniform circumpolar cooling during the Pleistocene. Furthermore, our SST records also imply massive equatorward migrations of the Antarctic Circumpolar Current (ACC) frontal systems and an enhanced transport of ACC water to lower latitudes during glacials by the Peru-Chile Current.

(Table 1) Geochemistry of surface sediment samples from the Chilean margin

Biogenic barium in marine sediments has been suggested to be a reliable proxy of export productivity from the surface ocean and algorithms have been developed to link these properties. However, problems arise when the proposed algorithms are applied to predominantly terrigenous sediments. A major source of error is incorrect estimates of the terrigenous Ba/Al ratio in normative calculations of the amount of biogenic barium in the sediment. Compared to an often used "global average" Ba/Al ratio, much better results can be obtained by estimating the terrigenous Ba/Al ratio from exponential regression of the Ba/Al ratios of surface sediments obtained from continental slope transects. This method has been applied to surface sediments from the Chilean continental slope. The calculated regional terrigenous Ba/Al ratios could be verified with purely terrigenous samples from Chilean rivers. The resulting accumulation rates of biogenic barium on the Chilean continental slope reliably reproduce the regional pattern of primary productivity in the southern Peru-Chile Current, indicating the potential of biogenic barium as a useful (paleo)productivity proxy.

Historia de la revolución hispano-americana /

Contiene: T. I (VIII, 116, 456 p., [6] h. de lám. pleg.)-- T. II (1830. 572 p., [7] h. de lám. pleg.) - T. III (1830. 631 p., [4] h. de lám. pleg.)

The South American republics /

Includes bibliographic references (v. 1, p. vi-vii; v. 2, p. vi-ii).

The modern traveller : a description, geographical, historical, and topographical, of the various countries of the globe /

v. l. Palestine.--v. 2-3. Syria and Asia Minor.--v. 4. Arabia.--v. 5-6. Egypt, Nubia, etc.--v. 7-10. India.--v. 11. Burmah, Siam, etc.--v. 12-13. Persia and China.--v. 14. Turkey.--v. 15-16. Greece.--v. 17. Russia.--v. 18-19. Spain and Portugal.--v. 20-22. Africa.--v. 23-24. America.--v. 25-26. Mexico, etc.--v. 27. Columbia.--v. 28. Peru-Chile.--v. 29-30. Brazil, etc.

The South American republics,

Bibliography: v. 1. p. vi-vii; v. 2, p. vi-ii.

The role of books in inter-American relations;

"The result of a six weeks' study of the Latin-American book field made at the request and done under the direction of the Department of state ... A survey was made of book publishing, selling and printing in Mexico, Panama, Colombia, Peru, Chile, Argentina, Uruguay, and Brazil."--Introd.

Defense Expenditure: Andean and Amazon Regions

The Andean and the amazon, comprised of Venezuela, Colombia, Bolivia, Peru and Ecuador, have recently undertaken significant modernization efforts ranging from equipment, logistics, doctrine, training, deployment and the re-definition of the roles and missions of their forces. In most cases, motivations to modernize have been internal, such as continuing operations against armed groups as in the case of Colombia and Peru, enhance border control and sovereignty enforcement, as in the case of Ecuador and Brazil or regime control in Venezuela. However, they are complemented by perceptions of external threats, including traditional intra-state conventional wars. The increased tensions between Colombia and Venezuela and Ecuador as well as the historic Peru-Chile tensions are the most salient examples. Although diplomacy –especially defence diplomacy- has worked to a good degree in creating and strengthening confidence building measures, the potential for inter-state conflict is higher in this region of the Americas. This region has seen the recent emergence of long-term modernization plans, initially in Colombia followed by Venezuela and Ecuador and probably best embodied in scope and scale by the Brazilian National Defence Plan (for its long term vision). Although it has been speculated that high allocation of funds to retirement pension systems has had an impact on delaying modernization plans, this comparative study on the allocation of pension and social funds in these particular countries concludes that there is no direct linkage between the poor funding of military modernization plans and the diversion of funds to military pension systems.

Educação de alunos superdotados/altas habilidades : legislação e normas nacionais : legislação internacional, América do Norte (EUA e Canadá), América Latina (Argentina, Chile e Peru), União Européia (Alemanha, Espanha, Finlândia, França)

Consultoria Legislativa - Área XV - Educação, Cultura e Desporto. Nome completo da autora: Maria Aparecida Andrés Ribeiro.