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Climate-ocean interactions in the eastern subtropical Cretaceous Atlantic: Integrating long-term and punctuated Late Aptian to Early Albian climate records from the Mazagan Plateau (DSDP Site 545)

东亚热带白垩纪大西洋的气候-海洋相互作用：整合来自马扎干高原的长期和间断的晚阿普第期到早阿尔布期气候记录（DSDP站点545）

基本信息

批准号：
143545492
负责人：
Professor Dr. Jens O. Herrle
金额：
--
依托单位：
School of Engineering
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/143545492?language=en
关键词：
Climate ocean interactions eastern subtropical

项目摘要

The Late Aptian to Early Albian represents a major transition in mid-Cretaceous tectonics, volcanic activity, climate and marine plankton communities, leading to a cascade of global and local perturbations of the climate-carbon cycle. The goal of this multi-proxy study is to develop complementary climate records in the eastern subtropical Atlantic region (DSDP Site 545) covering a time period of 5 million years. The overall aim is to decipher global and local climate signatures from marine sediments in order to address the underlying driving mechanisms and feedbacks of environmental and climate change. Our results quantify for the first time a long term cooling trend for the Upper Aptian that culminated in a „cold snap‟ by using TEX86-derived sea surface temperature estimates. The „cold snap‟ was associated with changes in the community of carbonate producers. We also recognize three short term temperature events with durations of less than 150 ka, a heating pulse (+4°C) and two cooling pulses (-2° to -2.5°C), which are superimposed onto the long term cooling trend. We tentatively relate short term warming to a (previously unknown) hyperthermal event, and the cooling periods to large scale re-organizations in North Atlantic deep water circulation, possibly related to the opening of oceanic gateways. In project phase two we propose to decipher the global or local aspects of the observed temperature development by studying a complimentary core from the Falkland Plateau (DSDP Site 511, South Atlantic) and by further investigation of the observed short climate pulses at Site 545.

Aptian晚期到Albian早期代表了白垩纪中期构造、火山活动、气候和海洋浮游生物群落的重大转变，导致了气候-碳循环的全球和局部扰动的级联。这一多代理研究的目标是在东亚热带大西洋地区（DSDP站点545）开发涵盖500万年时间段的补充气候记录。总体目标是从海洋沉积物中破译全球和地方气候特征，以解决环境和气候变化的潜在驱动机制和反馈问题。我们的研究结果首次量化了上Aptian的长期冷却趋势，通过使用TEX 86衍生的海面温度估计，最终导致了“寒流”。“寒流”与碳酸盐生产者社区的变化有关。我们还识别出三个持续时间小于150 ka的短期温度事件，一个加热脉冲（+4 ° C）和两个冷却脉冲（-2° C至-2.5 ° C），它们叠加在长期冷却趋势上。我们暂时与短期变暖（以前未知的）超高温事件，和冷却期大规模的重组在北大西洋深水环流，可能与海洋门户的开放。在项目第二阶段，我们建议通过研究福克兰高原（DSDP站点511，南大西洋）的一个补充核心，并通过进一步调查在站点545观察到的短气候脉冲，来破译观测到的温度发展的全球或局部方面。