Response of terrestrial environments to short-term climate perturbations: Low-latitude signals during the mid-Cretaceous super greenhouse world (ODP Leg 207, Demerara Rise)

陆地环境对短期气候扰动的响应：白垩纪中期超级温室世界的低纬度信号（ODP Leg 207，德梅拉拉海隆）

• 批准号: 12959625
• 负责人: Professor Dr. Jörg Pross
• 金额: --
• 依托单位: Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/12959625?language=en
• 关键词: Response; terrestrial; environments; short; term

The project aims at deciphering terrestrial environmental dynamics during the mid-Cretaceous supergreenhouse world based on the analysis of pollen and spores in marine sediments. This approach allows a straightforward correlation of data from the terrestrial and marine realms, thus yielding the opportunity to obtain a comprehensive view of global change. High-resolution palynological analyses will be carried out across the Cenomanian/Turonian boundary interval (CTBI) to assess terrestrial environmental change during formation of the Oceanic Anoxic Event 2 (OAE 2) black shale representing a major perturbation of the global carbon cycle. To assess terrestrial environmental change in the tropics, palynological analyses will be carried out on two CTBI sections from OOP Leg 207 (Demerara Rise). Complementary analyses will be performed on mid-latitude CTBI records from DSDP Site 551 (off SW England) or Wunstorf (N Germany) to obtain a regionally differentiated picture of terrestrial environmental change. The project has been designed to achieve the following main goals: (1) Identification of terrestrial climatic perturbations (such as precipitation and temperature change) connected to OAE 2 formation in the tropics and mid-latitudes. (2) Testing the hypothesis of a significant pC02 drop connected to OAE 2 formation. (3) Providing an estimate of terrestrial input into the marine realm at Demerara Rise during OAE 2 formation. (4) Identification of leads and lags between environmental signals from the terrestrial and marine realms during OAE 2 formation.

该项目的目的是根据对海洋沉积物中花粉和孢子的分析，破译白垩纪中期超级温室世界期间的陆地环境动态。这一方法使陆地和海洋领域的数据能够直接相互关联，从而有机会全面了解全球变化。高分辨率的孢粉分析将在整个Cenomanian/Turonian边界间隔（CTBI）进行，以评估在形成的海洋Anopartite事件2（OAE 2）黑色页岩代表全球碳循环的重大扰动期间的陆地环境变化。为了评估热带陆地环境变化，将对OOP 207航次（Demerara海隆）的两个CTBI剖面进行孢粉分析。将对来自DSDP 551站（英格兰西南部）或温斯托夫（德国北部）的中纬度CTBI记录进行补充分析，以获得陆地环境变化的区域差异图。该项目旨在实现以下主要目标：（1）确定与热带和中纬度OAE 2形成有关的陆地气候扰动（如降水和温度变化）。(2)测试与OAE 2形成相关的显著pCO 2下降的假设。(3)提供OAE 2形成期间德梅拉拉隆起海洋领域陆地输入的估计。(4)OAE 2形成期间陆地和海洋环境信号之间超前和滞后的识别。