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

摘要：根据该奖项，PI将在多个时间间隔独立测量秘鲁软体动物的14C，以确定上升流变化的长期趋势。上升流是东太平洋厄尔尼诺-南方涛动（ENSO）的决定性因素，特别是沿秘鲁海岸。这一现象的历史记录有限，该地区较早的代用记录也很少。该方案将利用赤道表面和深层上升水之间的通风年龄差异。通过筛选壳增量变化和序列d18O分析来检测El Nino事件。软体动物壳在18O年和14c年的同时漂移，确定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的理解，并深入了解过去的深水循环。此外，区域D R数据数据库的大量增加将改善许多学科的年龄定年。这项研究的更广泛的影响还包括通过参与研究的各个阶段来培养研究生和本科生。

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.