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Effects of ocean acidification on the formation and sinking of particle aggregates

海洋酸化对颗粒聚集体形成和下沉的影响

基本信息

批准号：
0850904
负责人：
Cindy Lee
金额：
$ 49.67万
依托单位：
SUNY at Stony Brook
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=0850904&HistoricalAwards=false
关键词：
Effects ocean acidification formation sinking

项目摘要

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."ABSTRACTOCE-0850904The ocean, which provides the largest global sink for anthropogenic CO2, has experienced large-scale changes in the surface ocean chemical equilibrium and elemental cycling due to decreases in seawater pH. CO2 related changes in the carbonate chemistry of the ocean affect biological processes including photosynthesis and calcification. Thus, calcifying phytoplankton species are likely to be particularly sensitive to changes in oceanic CO2 concentrations. These biogenic minerals in turn affect the formation rate and properties of aggregates and delay the microbial degradation of organic matter, thereby playing a significant role for organic matter cycling and export. Researchers from the State University of New York in Stony Brook are investigating the processes of marine particle aggregation and their sensitivity to ocean acidification. Through laboratory testing of cultured phytoplankton, the scientists aim to understand the mechanisms and consider the properties of aggregation that might most result in alterations of sedimentation and chemical export in the future ocean.Results from this research will provide important new insights on how a decrease in seawater pH could affect the biological pump of the ocean. This project is a collaborative effort between German and U.S. scientists and graduate students.

“这项奖励是根据2009年美国复苏和再投资法案（公法111-5）资助的。”海洋是全球最大的人为CO2汇，由于海水ph的降低，海洋表面化学平衡和元素循环发生了大规模变化。与CO2相关的海洋碳酸盐化学变化影响了光合作用和钙化等生物过程。因此，钙化浮游植物物种可能对海洋二氧化碳浓度的变化特别敏感。这些生物矿物反过来影响团聚体的形成速度和性质，延缓有机物的微生物降解，从而在有机质循环和输出中发挥重要作用。纽约州立大学石溪分校的研究人员正在研究海洋颗粒聚集的过程及其对海洋酸化的敏感性。通过对培养的浮游植物的实验室测试，科学家们的目标是了解其机制，并考虑最可能导致未来海洋沉积和化学物质输出变化的聚集特性。这项研究的结果将为海水pH值的降低如何影响海洋的生物泵提供重要的新见解。这个项目是德国和美国科学家以及研究生之间的合作成果。