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Effects in CO2 and light on the carbon acquisition of key diatom species in the Southern Ocean

二氧化碳和光对南大洋主要硅藻物种碳吸收的影响

基本信息

批准号：
75753284
负责人：
Dr. Scarlett Trimborn
金额：
--
依托单位：
Sektion Ökologische Chemie
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/75753284?language=en
关键词：
Effects CO2 light carbon acquisition

项目摘要

The ecology and biogeochemistry of the Southern Ocean is strongly dominated by key diatom species and the flagellate Phaeocystis. The mechanisms regulating the dominance of these species in the Southern Ocean ecosystem are poorly understood. According to the IPCC (scenario IS92a), surface water CO2 concentrations are expected to increase almost three-fold for the year 2100 relative to preindustrial values and to lower the pH (‘ocean acidification’) by 0.4 units. Rising temperatures will impact surface ocean stratification, which in turn will affect light climate and nutrient input from deeper layers. Climate models indicate that especially the Southern Ocean will be affected by these environmental changes. How will these changes shape phytoplankton community structure and possibly alter productivity? To answer this question the investigation of photosynthetic carbon acquisition has gained increasing importance in phytoplankton ecology. Studying the effects of CO2, light and iron on the carbon acquisition at the cellular and the ecosystem level will provide ecophysiological explanations for the spatial distribution of phytoplankton species in the present ocean and will further help predicting changes in future community structures. Moreover, the obtained results from this project will be incorporated in a cellular model and will be of particular relevance for improving parameterization of ecosystem models.

南大洋的生态学和海洋地球化学主要由硅藻和鞭毛藻Phaeocystis所控制。人们对这些物种在南大洋生态系统中占优势的调节机制知之甚少。根据气专委的预测（设想IS92a），预计到2100年，地表水CO2浓度将比工业化前增加近三倍，pH值（“海洋酸化”）将降低0.4个单位。温度上升将影响海洋表层的分层，这反过来又会影响光气候和更深层的营养物质输入。气候模型表明，特别是南大洋将受到这些环境变化的影响。这些变化将如何塑造浮游植物群落结构，并可能改变生产力？为了回答这个问题，光合碳获取的研究在浮游植物生态学中变得越来越重要。研究CO2、光和铁对细胞和生态系统水平碳获取的影响，将为目前海洋中浮游植物物种的空间分布提供生态生理学解释，并将进一步帮助预测未来群落结构的变化。此外，从该项目中获得的结果将被纳入细胞模型，并将对改善生态系统模型的参数化特别相关。