Quantifying Sampling Biases and Silicate-Derived Sr in Continental Runoff: A Coupled 87Sr/86Sr - 88Sr/86Sr Study

量化大陆径流中的采样偏差和硅酸盐衍生的 Sr：87Sr/86Sr - 88Sr/86Sr 耦合研究

基本信息

批准号：
1226818
负责人：
Bernhard Peucker-Ehrenbrink
金额：
$ 34.2万
依托单位：
Woods Hole Oceanographic Institution
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2012
资助国家：
美国
起止时间：
2012-09-01 至 2015-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1226818&HistoricalAwards=false
关键词：
Quantifying Sampling Biases Silicate Derived

项目摘要

The Strontium isotope (87Sr/86Sr) record of seawater is one of the best-reconstructed marine isotope records. It has been widely used to estimate temporal changes of continental and hydrothermal inputs to seawater, and temporal variations have been correlated with periods of glaciations, mountain building and major magmatic events. Despite this impressive record, estimates of the present-day mass balance of strontium in seawater fundamentally disagree, highlighting the challenges of interpreting the marine strontium isotope record.This project aims at investigating how severely present estimates of continental runoff into the ocean are biased, and how such biases can be corrected. The interpretation of the marine record critically hinges on an unbiased understanding of the present-day mass balance and forcing factors. In addition to the radiogenic (87Sr/86Sr) isotope composition, the stable (88Sr/86Sr) isotope signature may yield insights into the balance of silicate- vs carbonate-derived strontium, and thus the balance between silicate and carbonate weathering.The study will be conducted under the umbrella of the Global Rivers Observatory, a collaborative, international network of scientists and community volunteers aimed at observing river systems in time-series fashion. Citizen scientists and REU students will be engaged in sampling representative rivers draining the West and East coasts of North America. Local schools are invited to participate in the "My River, My Home" student art project.

海水的锶同位素（87SR/86SR）是最佳重建的海洋同位素记录之一。它已被广泛用于估计大陆和热液投入到海水的时间变化，并且时间变化与冰川，山地建筑和重大岩浆事件的时期有关。尽管有这一令人印象深刻的记录，但对海水中锶的当今质量平衡的估计从根本上不同意，强调了解释海洋南跨同位素记录的挑战。该项目旨在调查对海洋中大陆径流的严重估计，以及如何纠正这种偏见。海洋记录的解释批判性地取决于对当今质量平衡和强迫因素的公正理解。除了放射性（87SR/86SR）同位素组成之外，稳定（88SR/86SR）同位素签名还可以使硅酸盐衍生的层状和碳酸盐源性质量的平衡能够产生见解，从而在硅酸盐和碳酸盐范围内进行平衡。志愿者旨在以时间序列方式观察河流系统。公民科学家和REU学生将参与取样北美西部和东海岸的代表河流。邀请当地学校参加“我的河流，我的家”学生艺术项目。