Collaborative Research: Holocene Shell Accumulation from the Southeast Brazilian Bight: Multi-Centennial Dynamics of Oceanographic, Environmental, and Ecological Changes

摘要本研究将评估巴西东南湾（南大西洋西部）全新世海洋过程动力学，该地区受西边界赤道流、ENSO/ soi相关海岸径流、陆架断裂和海岸上升流事件的影响。pi将利用AAR（反相高效液相色谱法，用于分析天冬氨酸D/L比的亚毫克贝壳等分）和自动采样/分析技术的进展，从巴西东南湾的内大陆架、外大陆架和大陆斜坡的时间平均贝壳堆积点开发出多种稳定同位素和元素时间序列，确定腕足类和双壳类动物的年代。该项目的目标将是评估以下方面的百年至千年变化：(1)短期事件（ENSO/SOI，上升流）的频率；(2)南巴西洋流的强度和位置；(3)贝类生物生产力，以评估有关洋流传热的长期稳定性、南大西洋enso相关海岸径流频率变化以及陆架断裂和海岸上升流的波动性对全球尺度气候过程的响应的假设。这项研究将支持一名博士后科学家，让学生参与，并产生新的国际协同效应。该项目由国际科学与工程办公室共同资助。

AbstractCollaborative Research: Holocene Shell Accumulation from the Southeast Brazilian Bight: Multi-Centennial Dynamics of Oceanographic, Environmental, and Ecological ChangesThis study will assess the Holocene dynamics of oceanographic processes on the Southeast Brazilian Bight (western South Atlantic), a region affected by a western boundary equatorial current, ENSO/SOI-related coastal runoffs, and shelf-break and coastal upwelling events. The PIs will exploit advances in AAR (reverse-phase HPLC for analyzing sub-milligram shell aliquots for asparitic acid D/L ratios) and automated sampling/analytical techniques, to develop multiple stable isotope and elemental time-series of dated brachiopods and bivalves from time-averaged shell accumulation sites across the inner shelf, outer shelf, and continental slope of the Southeast Brazilian Bight. The objectives of this project will be to evaluate multi-centennial to multi-millennial changes in (1) the frequency of short-term events (ENSO/SOI, upwelling); (2) the strength and position of the South Brazil Current; and (3) shellfish bio-productivity in order to evaluate hypotheses regarding the long-term stability of heat-transfer by ocean currents, changes in frequency of ENSO-related coastal runoff in the South Atlantic, and volatility of shelf-break and coastal upwelling as they respond to global-scale climatic processes. This research will support a post-doctoral scientist, involve students and generate new international synergies. This project was co-funded with support from the Office of International Science and Engineering.