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...

在东地中海盆地的晚第四纪记录中，表明周期性缺氧的腐泥层早已被认识到。最近的研究表明，这些形成是对地中海自然受精的反应，每 23,000 年发生一次，表明强迫机制是季风强度的进动调制。生态变化和营养物质通过表层海洋生态系统传播的机制仍然缺乏约束。这限制了我们利用缺氧事件来预测当前气候变化和富营养化可能导致的类似情况的能力。将实施一种新的多代理方法来重建海洋生产力的响应程度和对气候变化的支持养分通量。此外，我们的目标是通过分析关键的地中海钙化海洋浮游植物——颗石藻来监测碳系统的变化。为了量化过去营养条件的变化，我们将使用培养物样本、沉积物捕集器材料、岩心顶部沉积物和次新沉积物的独特组合来完善我们的代理......然后，这些精致的代理将应用于时间间隔对应于过去 200 kyr 中生育率提高的三个确定阶段...