Records of element ratios obtained from the Maldives Inner Sea sediments provide a detailed view on how the Indian Monsoon System has varied at high-resolution time scales. Here, we present new records from IODP Site U1471 based on a refined chronology through the past 550,000 years. The record's high resolution and a proper approach to set the chronology allowed us to reconstruct changes in the Indian Monsoon System on a scale of anomalies and to verify their relationships with established records from the East Asian Monsoon System. On the basis of Fe/sum and Fe/Si records, it can be demonstrated that the Asia continental aridity tracks sea-level changes, while the intensity of winter monsoon winds responds to changes in Northern hemisphere summer insolation. Furthermore, the anomalies of continental aridity and intensity of winter monsoon winds at millennial-scale events exhibits power in the precession band, nearly in anti-phase with Northern hemisphere summer insolation. These observations indicate that the insolation drove the anomalies in the Indian Summer Monsoon. The good correspondence between our record and the East Asian monsoon anomaly records suggests the occurrence of anomalous widespread arid events in Asia.
Ao meu pai e a minha mãe que em todos esses anos me deram um bom ambiente familiar, valorizando o caráter, a boa conduta e o respeito ao próximo. A Fatinha que sempre esteve presente, desde que me conheço por gente e dia após dia vem cuidando da nossa família. Ao meu orientador Prof. Dr. Luigi Jovane pela oportunidade de realizar este trabalho, por todo o conhecimento compartilhado e pela grande amizade. Aos Técnicos do Laboratório de Paleomagnetismo Danielle, Giovani e Plinio por todo suporte, treinamento e pela grande amizade. Aos tripulantes e cientistas do Joides Resolution Science Operator presentes na expedição IODP 359 pela boa coleta, fornecendo-me bom material para a realização deste trabalho. Ao Instituto Oceanográfico e a Universidade de São Paulo por toda a formação que me proporcionaram, e pelo bom ambiente que pude dispor dia após dia. Ao nosso querido Deus que tem cuidado de mim nesta vida tão atribulada.
Susceptibility and vulnerability to impacts make Cetaceans and Benthic Foraminifera sentinels of health in marine environments. A breeding population of Right whales (Eubalaena australis) annually migrates to the “Environmental Protection Area” in Santa Catarina, Brazil, where Ribanceira/Ibiraquera Bay, and its harbor, are located. Since Right whales rest in shallow areas, their stomachs touch the marine sediment bottom, where foraminiferal assemblages inhabits. Temperature, salinity, pH, turbidity, grain size, morphometry, and magnetic susceptibility correlated to foraminiferal species, contribute to the understanding of habitat preference for right whales. Here we show saline waters in the northern areas associated with Pseudononion atlanticum, Elphidium sp., Buccella peruviana, Quinqueloculina patagonica, and 21°C of temperature is the preferred by mother and calf pairs. The harbor has lower pH, higher temperatures, magnetic susceptibility, and turbidity, and high depth is due to dredging. These characteristics do not support the presence of the Right whales, the top of the food pyramid, so decline or increase in their population indicates changes in their habitat. We stress the importance of unravelling signals of Benthic and Nekton coupling by understanding whales’ habitat; to ensure the recovery of their populations, and the survival of other species in the marine ecosystem.
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