Ocean Acidification- Category 1: Real time assessment of ocean acidification proxies and their incorporation in the marine sediment record

海洋酸化 - 第 1 类：海洋酸化指标的实时评估及其在海洋沉积物记录中的纳入

基本信息

批准号：
1039503
负责人：
Robert Thunell
金额：
$ 44.09万
依托单位：
University South Carolina Research Foundation
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2010
资助国家：
美国
起止时间：
2010-09-01 至 2014-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1039503&HistoricalAwards=false
关键词：
Ocean Acidification Category Real time

Ocean Acidification Category Real time

项目摘要

The large and rapid release of CO2 into the atmosphere over the past two centuries and resultant uptake of a significant fraction of this by the oceans have resulted in measurable changes in ocean chemistry, most notably decreases in both pH and carbonate ion concentration. This change in atmospheric CO2 during the last 200 years and its concomitant effect on seawater chemistry are not unique but rather have occurred frequently throughout geologic history. Quantifying the response of the oceans to such naturally occurring changes in atmospheric CO2 provides valuable insights for modeling and predicting future changes in ocean chemistry associated with anthropogenic increases in CO2. This work examines three carbonate ion and pH proxies (weight, B/Ca and boron isotope composition of planktonic foraminiferal shells) using the 15-year time series of sediment trap samples and water column chemistry measurements collected biweekly as part of the Cariaco Basin ocean time series. These results will be compared to monthly measurements of upper water column carbonate ion and pH made at the time series site. High deposition rate, laminated sediments accumulating in the Cariaco Basin will be used to make a direct comparison between changes in these three foraminiferal pH proxies and the atmospheric CO2 record for the last two centuries, a period during which CO2 has increased by ~100 ppmv. The end product of the research will be an in-depth field-calibration of these widely used pH proxies. Funding supports a graduate student, and provides opportunities for undergraduate involvement in research.

在过去的两个世纪中，二氧化碳的大量释放到大气中，并且由海洋大部分的吸收量导致了海洋化学的可测量变化，最值得注意的是，pH和碳酸盐离子浓度都会降低。在过去的200年中，大气二氧化碳的这种变化及其对海水化学的伴随影响不是独特的，而是在整个地质史上经常发生。量化海洋对大气二氧化碳中这种自然发生变化的反应为建模和预测与人为化学相关的海洋化学变化的未来变化提供了有价值的见解。这项工作使用15年的沉积物陷阱样品和水柱化学测量值，作为Cariaco盆地盆地时间系列的一部分，使用15年的沉积物陷阱样品和水柱化学测量，使用了15年的沉积物陷阱样品和水柱化学测量，研究了三个碳酸盐离子和pH值（重量，B/Ca和Boron同位素组成）。这些结果将与在时间序列位点上的上水柱离子和pH值的每月测量进行比较。高沉积速率，在Cariaco盆地中积累的层压沉积物将用于直接比较这三个有孔虫pH代理的变化与过去两个世纪的大气CO2记录之间的变化，在此期间，CO2在此期间增加了约100 ppmv。该研究的最终产物将是这些广泛使用的pH代理的深入现场校准。资金支持研究生，并为大学参与研究提供了机会。