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

合作研究：软体动物放射性碳作为秘鲁全新世上升流的代理

• 批准号: 0502533
• 负责人: C. Frederick Andrus
• 金额: $ 15.31万
• 依托单位: University of Alabama Tuscaloosa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-15 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0502533&HistoricalAwards=false
• 关键词: Collaborative; Research; Molluscan; Radiocarbon; Proxy

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.

摘要：根据该奖项，PI将从多个时间间隔中独立日期的秘鲁软体动物中测量14C，以定义上升变化的长期趋势。上升是东太平洋，尤其是秘鲁沿岸的El Nino-Southern振荡（ENSO）的决定性因素。这种现象的历史记录有限，该地区的较旧代理记录很少。该提案将利用赤道表面和更深的水域中的通风年龄差异。 通过筛选壳增量改变和顺序D18O分析，将进行El Nino事件的检测。 Molluscan壳中D 18O和D14C的同时偏移确定了El Ninos引起的上升变化的周期。通过提供秘鲁全新世上升的数据，该项目将提供对古探索的理解，并深入了解过去的深水循环。此外，区域D R数据数据库的大幅度增加将改善许多学科的年龄。这项研究的更广泛影响还包括通过参与各个研究阶段的研究生和本科生培训。