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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

基本信息

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

项目摘要

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230 Th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。这项研究将解决争议，在使用这种技术的基础上，在230 Th模型的假设。具体来说，PI将解决的问题，如何解释沉积230 Th库存沿着赤道在太平洋大于预期的恒定水柱生产率。他们将比较横向平流沉积物通量可以超过垂直降雨通量2-4倍的假设与质量积累率受230 Th流动性和中太平洋环流230 Th横向运输影响的论点。这个项目将对这个问题得出不同结论的PI组成团队。该奖项支持一项研究巡航，将收集水柱，沉积物陷阱和沉积物（低通量红粘土环境），以确定是否可能发生重大的230 Th运输出该地区。该奖项还支持研究生三年的教育和培训，邮轮将包括研究生和本科生的航海经验。