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

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，二氧化碳大量而快速地释放到大气中，并导致海洋吸收了其中的很大一部分，导致海洋化学发生了可测量的变化，最显着的是pH值和碳酸根离子浓度的下降。过去 200 年来大气二氧化碳的这种变化及其对海水化学的伴随影响并不是独一无二的，而是在整个地质历史中经常发生。量化海洋对大气二氧化碳自然发生变化的反应，为建模和预测与人为二氧化碳增加相关的海洋化学的未来变化提供了宝贵的见解。这项工作使用 15 年时间序列的沉积物陷阱样本和作为卡里亚科盆地海洋时间的一部分每两周收集的水柱化学测量值，检查了三种碳酸根离子和 pH 指标（浮游有孔虫壳的重量、B/Ca 和硼同位素组成）系列。这些结果将与在时间序列现场进行的上部水体碳酸根离子和 pH 值的每月测量值进行比较。卡里亚科盆地堆积的高沉积率层状沉积物将用于直接比较这三种有孔虫 pH 值指标的变化与过去两个世纪的大气二氧化碳记录，在此期间二氧化碳增加了约 100 ppmv。研究的最终产品将是对这些广泛使用的 pH 值代理进行深入的现场校准。资金支持研究生，并为本科生参与研究提供机会。