230Th dynamics in the Eastern Equatorial Pacific Ocean: testing the 230Th-normalization method to estimate sediment fluxes

东赤道太平洋的 230Th 动力学：测试 230Th 归一化方法来估计沉积物通量

• 批准号: 0851056
• 负责人: Franco Marcantonio
• 金额: $ 40.18万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0851056&HistoricalAwards=false
• 关键词: 230Th; dynamics; Eastern; Equatorial; Pacific

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Understanding the behavior of 230Th is critical to interpret the sedimentary record and understand how climate change affects oceanographic processes. This study will address the controversy in using this technique based on assumptions made in the 230Th model. Specifically, the PIs will address the issue of how one explains sedimentary 230Th inventories along the equator in the Pacific that are larger than those expected from a constant water column production rate. They will compare the assumption that the flux of laterally advected sediment can surpass the vertically rained flux by up to 2-4 times versus the argument that mass accumulation rates are affected by 230Th mobility and lateral transport of 230Th from the central Pacific gyres. This project teams up PIs who have reached different conclusions about this question. The award supports a research cruise that will collect water column, sediment trap, and sediment (low-flux red-clay environments) to determine if significant 230Th transport might occur out of the region. The award also supports education and training of a graduate student for three years, and the cruise will include sea-going experience for both graduate and undergraduate students.

该奖项由 2009 年美国复苏和再投资法案（公法 111-5）资助。了解 230Th 的行为对于解释沉积记录和了解气候变化如何影响海洋过程至关重要。 本研究将基于 230Th 模型中的假设来解决使用该技术的争议。具体来说，PI 将解决如何解释太平洋赤道沿线沉积物第 230Th 储量的问题，这些储量大于恒定水柱生产率所预期的储量。他们将比较横向平流沉积物通量可以超过垂直降雨通量高达 2-4 倍的假设与质量积累率受到 230Th 流动性和来自太平洋中部环流的 230Th 横向传输影响的论点。该项目由 PI 组成，他们对这个问题得出了不同的结论。该奖项支持一项研究巡航，该巡航将收集水柱、沉积物捕集器和沉积物（低通量红粘土环境），以确定是否可能发生重大的 230Th 迁移出该地区。该奖项还支持研究生为期三年的教育和培训，邮轮将为研究生和本科生提供航海体验。