Late Pleistocene variations of the diatom productivity in the high-latitude Atlantic: convergence shifts, nutrient availability, and rapid climate variability

高纬度大西洋硅藻生产力的晚更新世变化：收敛变化、养分可用性和快速气候变化

• 批准号: 242091056
• 负责人: Dr. Oscar Romero, Ph.D.
• 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: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/242091056?language=en
• 关键词: Late; Pleistocene; variations; diatom; productivity

This project will address the variability of the siliceous paleoproductivity in the Subarctic Atlantic (Site U1304) and its relation to climatic, biogeochemical and hydrographic events occurred during the last 450 kyr. Site U1304 (ca. 53ºN, 33ºW) represents a high-sedimentation record of late Pliocene and Pleistocene environmental conditions in the high-latitude Atlantic. By exploring the long-term and the rapid variations (<103 yr) in the diatom community occurred during the late Pleistocene, we will address the variations of diatom production related with North Atlantic climate history and the shift between production of siliceous and calcareous organisms. Opal, and major and trace elements will help to characterize variations of productivity and latitudinal migration of the Subarctic Convergence. The study of long sequences of diatom-rich laminated sediments at Site U1304 will deliver ultra-high resolution information on climate and hydrography variability of the subpolar Atlantic. The proposed multi-parameter approach will contribute to the comprehension of the relative phasing of atmospheric and oceanic changes in the high-latitude North Atlantic that are central to our understanding of the mechanisms of global climate change on orbital to millennial timescales.

本项目将研究近450年来亚北极大西洋（U1304站点）硅质古生产力的变化及其与气候、生物地球化学和水文事件的关系。U1304遗址（约53ºN， 33ºW）代表了高纬度大西洋地区晚上新世和更新世环境条件的高沉积记录。通过探索晚更新世硅藻群落的长期和快速变化（<103年），我们将解决与北大西洋气候历史相关的硅藻生产变化以及硅质和钙质生物生产之间的转变。蛋白石、主要元素和微量元素将有助于表征亚北极辐合带的生产力变化和纬度迁移。U1304站点富含硅藻层状沉积物的长序列研究将提供关于亚极地大西洋气候和水文变化的超高分辨率信息。提出的多参数方法将有助于理解北大西洋高纬度地区大气和海洋变化的相对相位，这对我们理解全球气候变化在轨道到千年时间尺度上的机制至关重要。