Pleistocene-Holocene Southern Ocean coccolithophore calcification and productivity

更新世-全新世南大洋颗石藻钙化和生产力

• 批准号: NE/T009489/1
• 负责人: Tom Dunkley Jones
• 金额: $ 5.14万
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FT009489%2F1
• 关键词: Pleistocene; Holocene; Southern; Ocean; coccolithophore

Marine phytoplankton form the basis of pelagic food webs and ecosystems. With modern anthropogenic environmental impacts - including eutrophication, climate change and ocean acidification - there is evidence that this group is already experiencing biogeographic range shifts and changes to community structure. Here, we seek to investigate the response of a key group of marine phytoplankton to rapid environmental change, especially acidification, in the Southern Ocean. The alage concerned produce calcium carbonate (calcite) plate-like scales, which are produced by and surround the cell during life, but on death accumulate in great numbers in deep ocean sediments. These fossil scales, called coccoliths, can be used to reconstruct the abundance and diversity of species that were living in the surface ocean across millions of years. The chemistry of coccoliths can also be used as an indicator of cell processes and the conditions in the surface ocean environment at the time the coccoliths were formed. Together, we propose to use the variations in the size and abundances of coccoliths produced by different species, as well as chemical indicators of cell growth rates and environment, to determine the response of coccolithophore algae in the Southern Ocean to intervals of rapid ocean acidification in the recent past, specifically those associated with rapid increases in atmospheric carbon dioxide concentrations at the end of glacial climate intervals.

海洋浮游植物是海洋食物网和生态系统的基础。随着现代人为环境影响----包括富营养化、气候变化和海洋酸化----有证据表明，这一群体已经经历了地理范围的转移和群落结构的变化。在这里，我们试图调查的一个关键群体的海洋浮游植物快速环境变化，特别是酸化，在南大洋的反应。藻类产生碳酸钙（方解石）板状鳞片，这些鳞片在生命期间由细胞产生并围绕细胞，但在死亡时大量积累在深海沉积物中。这些被称为球石的化石鳞片可以用来重建数百万年来生活在海洋表面的物种的丰度和多样性。球石的化学成分也可以用来指示细胞过程和球石形成时海洋表面环境的条件。总之，我们建议使用不同物种所产生的颗石的大小和丰度的变化，以及细胞生长速率和环境的化学指标，以确定南大洋的颗石藻对最近海洋快速酸化间隔的反应，特别是与冰川气候间隔结束时大气二氧化碳浓度快速增加有关的反应。

项目成果

Coupled Coccolith-Based Temperature and Productivity High-Resolution Reconstructions in the Eastern Equatorial Pacific During the Last Deglaciation and the Holocene

• DOI: 10.3389/fmars.2022.865846
• 发表时间: 2022-06
• 作者: M. Saavedra‐Pellitero;I. Hernández‐Almeida;E. Cabarcos;K. Baumann;T. Dunkley Jones;F. Sierro;J. Flores

Late Pleistocene-Holocene coccolithophore variations in the Subantarctic South Pacific

亚南极南太平洋晚更新世-全新世球石藻变化

• DOI: 10.5194/egusphere-egu23-13273
• 发表时间: 2023
• 作者: Malinverno E