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

AbstractCollaborative Research：全新世壳积累从东南巴西湾：多世纪的海洋学，环境和生态变化的动力学这项研究将评估全新世的海洋学过程的东南巴西湾（西南大西洋），一个受西部边界赤道流，ENSO/SOI相关的沿海径流，陆架断裂和沿海涌升事件的区域。该PI将利用AAR（反相HPLC分析亚毫克壳等分试样的藻酸D/L比）和自动化采样/分析技术的进步，开发多种稳定同位素和元素的时间序列的日期腕足动物和双壳类动物从时间平均壳积累地点横跨内大陆架，外大陆架，和大陆坡的东南巴西湾。本项目的目标是评估从几百年到几千年的变化：（1）短期活动的频率（2）南巴西流的强度和位置;和（3）贝类生物生产力，以评估关于洋流传热长期稳定性的假设，南大西洋与厄尔尼诺/南方涛动有关的沿海径流频率的变化，以及陆架断裂和沿海涌升对全球尺度气候过程作出反应时的波动性。这项研究将支持博士后科学家，让学生参与并产生新的国际协同效应。该项目由国际科学和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.