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

本研究将探讨春季浮游生物群落水华期间溶解态和颗粒态有机物之间碳分配的温度敏感性。初级生产、降解和聚集过程在温度依赖性方面各不相同。因此，全球变暖可能会影响海洋表层有机物源和汇之间的平衡。这可能导致原生有机物的命运及其在水层系统中溶解相和颗粒相之间的分配发生各种变化。在生态系统一级，这些温度效应受到几种相互作用的生物和生物物理过程（例如基质和光限制）的调节，这些过程也可能在温度敏感性方面表现出很大的差异。为了研究气候变暖对生态系统一级溶解有机物的产生和归宿的影响，该项目将作为在IfM基尔进行的一项联合围隔实验的一部分进行。将进行补充恒化器和分批培养实验，以检查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.