The impact of temperature on the partitioning between particulate and dissolved organic carbon in a pelagic new production system

该项目将研究在一个天然浮游生物群落的春季繁殖期，溶解有机物和颗粒有机物之间的碳分配对温度的敏感性。初级生产、降解和聚集过程对温度的依赖性不同。因此，全球变暖可能会影响海洋表层有机质源汇的平衡。这可能会引起各种变化，涉及初级产生的有机物的命运及其在远洋系统中溶解相和颗粒相之间的分配。在生态系统水平上，这些温度效应是由几个相互作用的生物和生物物理过程（如基质和光照限制）调节的，这些过程也可能在温度敏感性上表现出很大的差异。为了在生态系统水平上研究变暖对溶解有机物的产生和命运的影响，该项目将作为IfM Kiel联合中生态实验的一部分进行。将进行辅助恒化和批量培养实验，以检验营养比例和长期降解对上述过程的影响。

This project will investigate the temperature-sensitivity of carbon partitioning between dissolved and particulate organic matter during a spring bloom of a natural plankton community. Primary production, degradation and aggregation processes differ regarding their temperature-dependence. Global warming is therefore likely to affect the balance between organic matter source and sink terms in the surface ocean. This can cause a variety of changes regarding the fate of primary produced organic matter and its partitioning between the dissolved and particulate phase in pelagic systems. On the ecosystem level these temperature effects are modulated by several interacting biological and biophysical processes (e.g. substrate and light limitation), which also are likely to display large differences in temperature-sensitivity. To examine the effect of warming on the production and fate of dissolved organic matter at the ecosystem level this project will be conducted as part of a joint mesocosm experiment at the IfM Kiel. Supplementary chemostat and batch cultures experiments will be carried out to examine the effect of nutrient ratios and long-term degradation on the processes described above.