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

合作研究：巴西东南部全新世贝壳堆积：海洋、环境和生态变化的多个百年动态这项研究将评估巴西东南部(南大西洋西部)全新世海洋过程的动力学，该地区受到西部边界赤道流、与ENSO/SOI相关的海岸径流、陆架断裂和海岸上升流事件的影响。PIS将利用AAR(用于分析亚毫克贝壳等分中天冬氨酸D/L比率的反相高效液相)和自动采样/分析技术的进展，从巴西湾东南部陆架、外架和大陆坡的贝壳聚集点开发多种稳定的同位素和元素时间序列，以确定腕足类和双壳类的年代。该项目的目标是评估以下方面的百年至几千年的变化：(1)短期事件(ENSO/SOI，上升流)的频率；(2)巴西南部洋流的强度和位置；(3)贝类生物生产力，以评价关于洋流热量传递的长期稳定性、南大西洋与ENSO有关的沿海径流频率的变化以及陆架断裂和沿海上升流对全球规模气候过程的反应的波动性的假设。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。该项目得到了国际科学和工程办公室的共同资助。

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.