Collaborative Research: Molluscan Radiocarbon as a proxy for Upwelling in Holocene Peru

摘要：根据该奖项，PI将从多个时间间隔测量独立年代的秘鲁软体动物的14C，以确定上升流变化的长期趋势。上升流是东太平洋，特别是秘鲁沿岸厄尔尼诺-南方振荡(ENSO)的一个决定性因素。关于这一现象的历史记录有限，该地区较早的代理记录也很少。该提议将利用赤道表面和更深的上升水之间的通风年龄差异。厄尔尼诺事件的探测将通过筛选贝壳增量变化和顺序的d18O分析来进行。软体动物贝壳中d18O和d14C的同时漂移识别了厄尔尼诺引起的上升流变化时期。通过提供秘鲁全新世上升流的数据，该项目将提供对古ENSO的了解，并洞察过去的深水循环。此外，区域研发数据数据库的大幅增加将改善许多学科的年龄测定。这项研究的更广泛影响还包括通过参与研究的所有阶段对研究生和本科生进行培训。

Abstract: Under this award the PI will measure 14C in independently dated Peruvian mollusks from multiple time intervals to define long-term trends in upwelling variation. Upwelling is a defining factor of El Nino-southern oscillation (ENSO) in the eastern Pacific, particularly along the coast of Peru. Historical records of this phenomenon are limited and older proxy records in this region are few. The proposal will exploit the ventilation age difference between equatorial surface and deeper upwelled waters. The detection of El Nino events will be made by screening for shell increment alteration and by sequential d18O analysis. The simultaneous excursions in d 18O and D14C in molluscan shell identify periods of upwelling variation caused by El Ninos. By providing data of Peruvian Holocene upwelling this project will provide understanding of paleo-ENSO and give insight into past deep water circulation. Furthermore, the large increase in the database of regional D R data will improve age-dating in many disciplines. Broader impacts of this research also include graduate and undergraduate student training through participation in all stages of research.