FP 35: Quaternary marine ecosystem response to fertilization: Mediterranean sapropel events and implications for marine carbon uptake

FP 35：第四纪海洋生态系统对施肥的响应：地中海腐泥事件及其对海洋碳吸收的影响

• 批准号: 5447608
• 负责人: Professor Dr. Kay-Christian Emeis
• 金额: --
• 依托单位: Departament de Geografia
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5447608?language=en
• 关键词: FP; 35; Quaternary; marine; ecosystem

Within the Late Quaternary record of the Eastern Mediterranean basin, sapropel horizons indicating periodic anoxia have long been recognised. Recent research has shown that these form in response to natural fertilization of the Mediterranean Sea and occur every 23.000 years, suggesting that the forcing mechanism is a precessional modulation of monsoon strenght. The mechanisms of ecologcial change and propagation of nutrients through the surface ocean ecosystem remain poorly constrained. This limits our ability to use anoxic events to predict likely analogue situations as a result of present day climate change and eutrophication. A new multi-proxy approach will be implemented to reconstruct both, the extent of the response in marine productivity and the supporting nutrient fluxes to climate change. Further, we aim to monitor changes in the carbon system by analysing the key Mediterranean calcifying marine phytoplankton, coccolithophorids. To quantify the change in trophic conditions in the past, we will refine our proxies using a unique combination of culture samples, sediment trap material, core top sediments, and sub-recent sediments... These refined proxies will then be applied to time intervals corresponding to three defined phases of enhanced fertility over the last 200 kyr...

在东地中海盆地的第四纪晚期记录中，长期以来表明周期性缺氧的sapropel视野已被认识到。最近的研究表明，这些形式响应地中海的自然施肥，每23.000年发生一次，这表明强迫机制是季风strenght的进攻性调节。生态变化的机制和通过表面海洋生态系统的养分传播的局限性仍然很大。这限制了我们使用缺氧事件来预测由于当今的气候变化和富营养化的结果的能力。将实施一种新的多种方法，以重建海洋生产力的反应程度以及对气候变化的支持营养通量。此外，我们旨在通过分析关键的地中海钙化海洋浮游生物，碳虫的钙化，以监测碳系统的变化。为了量化过去的营养条件的变化，我们将使用培养样品，沉积物陷阱材料，核心顶部沉积物和次级沉积物的独特组合来完善代理...然后将这些精制的代理应用于对应于最后200 kyr中增强生育能力的三个定义阶段的时间间隔...