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ADAPTation of COCCOlithophore communities to environmental change in the Southern Ocean (ADAPT-COCCO)

COCCO石藻群落对南大洋环境变化的适应（ADAPT-COCCO）

基本信息

批准号：
399488049
负责人：
Dr. Karl-Heinz Baumann, Ph.D.
金额：
--
依托单位：
Fachgebiet Sedimentologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/399488049?language=en
关键词：
ADAPTation COCCOlithophore communities environmental change

项目摘要

The marine communities of the Southern Ocean are extremely vulnerable to anthropogenic environmental change. Warming and acidification of surface waters are already impacting the plankton communities that form the basis of Southern Ocean marine food webs. The productivity of the plankton also influences the ability of the Southern Ocean to absorb carbon dioxide from the atmosphere. With regions of the Southern Ocean set to experience some of the highest rates of ocean acidification over the coming century, it is imperative to design evidence-based strategies for this marine environment of global importance.Single-celled coccolithophore algae are the dominant group of calcifying phytoplankton in the Southern Ocean. As marine calcifyers they will be impacted by reduced surface ocean carbonate ion concentrations as a result of ocean acidification. Although satellite estimations suggest that calcification rates have recently decreased in broad areas of the Southern Ocean, there is still controversy about whether ocean acidification will promote or reduce coccolithophore calcification rates in the future. This project will address this scientific question focusing on different late Quaternary time slices and by using scanning electron microscopy (for coccolithophore assemblages), an automated system of coccolith recognition -SYRACO- (for coccolith mass estimates) and organic geochemistry (for [CO2(aq)] estimates). The findings from this proposal will help to test the limits of [CO32-] and temperature controls on coccolithophore occurrences and will provide a key baseline dataset for monitoring 21st Century changes in Southern Ocean phytoplankton communities.

南大洋的海洋群落极易受到人为环境变化的影响。表层沃茨的变暖和酸化已经影响到构成南大洋海洋食物网基础的浮游生物群落。浮游生物的生产力也影响南大洋从大气中吸收二氧化碳的能力。南大洋地区将在未来的世纪经历最高的海洋酸化率，因此必须为这一具有全球重要性的海洋环境设计基于证据的策略。单细胞颗石藻是南大洋钙化浮游植物的主要群体。作为海洋钙化者，它们将受到海洋酸化造成的海洋表层碳酸盐离子浓度降低的影响。尽管卫星估计表明南大洋大范围地区的钙化率最近有所下降，但关于海洋酸化是否会促进或降低未来颗石藻的钙化率仍然存在争议。该项目将解决这一科学问题，侧重于不同的晚第四纪时间片，并使用扫描电子显微镜（用于颗石组合），一个自动化的颗石识别系统-SYRACO-（用于颗石质量估计）和有机地球化学（用于[CO2（aq）]估计）。该提案的结果将有助于测试[CO 32-]和温度控制对颗石藻出现的限制，并将为监测南大洋浮游植物群落21世纪的变化提供关键的基线数据集。