Climate development and vegetation feedbacks in tropical Africa during Heinrich events (data - model comparison)

海因里希事件期间热带非洲的气候发展和植被反馈（数据-模型比较）

• 批准号: 48554777
• 负责人: Dr. Lydie Madeleine Dupont
• 金额: --
• 依托单位: Zentrum für Marine Umweltwissenschaften (MARUM)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/48554777?language=en
• 关键词: Climate; development; vegetation; feedbacks; tropical

The ocean circulation, in particular the Atlantic meridional overturning circulation (MOC) has a strong impact on global climate, both at high and low latitudes. However, the role of the tropics is debated. High resolution studies aiming at tropical variability of the glacial period, when much variability in the MOC occurred, are scarce. We want to bridge this gap with a high resolution study on climate and vegetation development in tropical Africa by means of palynology on marine sediments of Ocean Drilling Program Site 1078 off the coast of Angola. The response and feedbacks of the vegetation in Angola during several periods of abrupt climate change during the glacial (Heinrich events) should provide insight in the impact of MOC variability in the southern tropics and the rapid propagation of climatic disturbances through the atmosphere. The use of an Earth system-climate model will allow us to study the dynamics of the vegetation cover for specific wind field patterns. In analyzing the model results, our focus will be on the induced precipitation anomaly and shifts in plant-functional types/biomes in western Africa and eastern South America. Model-data comparisons will rely on literature data and our own data acquisition ofthe Angolan vegetation variability during several Heinrich events. We want to test the influence of the latitudinal position and migration of the Intertropical Convergence Zone on the climate of tropical Africa during periods of partial or complete MOC shut-down.

海洋环流，特别是大西洋经向翻转环流（MOC）对高纬度和低纬度的全球气候都有很大的影响。然而，热带地区的作用存在争议。针对冰河期热带变化的高分辨率研究很少，当时 MOC 发生了很大的变化。我们希望通过对安哥拉海岸附近海洋钻探计划站点 1078 的海洋沉积物进行孢粉学研究，对热带非洲的气候和植被发育进行高分辨率研究，从而弥补这一差距。安哥拉植被在冰期（海因里希事件）期间气候突变的几个时期的响应和反馈应该有助于了解南部热带地区 MOC 变化的影响以及气候扰动通过大气的快速传播。使用地球系统气候模型将使我们能够研究特定风场模式的植被覆盖动态。在分析模型结果时，我们的重点将放在西非和南美洲东部诱发的降水异常和植物功能类型/生物群落的变化。模型数据比较将依赖于文献数据和我们自己在几次海因里希事件期间采集的安哥拉植被变化数据。我们想要测试在 MOC 部分或完全关闭期间，热带辐合带的纬度位置和迁移对热带非洲气候的影响。