Marine Isotope Stage 11 in the Pacific Southern Ocean; a coccolithosphore perspective

南太平洋海洋同位素第 11 阶段；

• 批准号: 237879864
• 负责人: Dr. Pilar Mariem Saavedra-Pellitero
• 金额: --
• 依托单位: Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
• 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 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/237879864?language=en
• 关键词: Marine; Isotope; Stage; 11; Pacific

This project aims to get new insights into the late Pleistocene interglacial Marine Isotope Stage (MIS 11) in the Pacific sector of the Southern Ocean, where little information is available. MIS 11 (between ca. 424 and 374 kyr) is a unique exceptionally long interglacial period often regarded as an analogue of what the Holocene would have been without any anthropogenic interference. Thick white layers with high carbonate content have been observed at high southern latitudes during this time interval. We intend to elaborate an integrated, multi-parameter record of coccolithophore data on MIS 11 sediments retrieved during R/V Polarstern ANT XXVI/2 expedition in the polar South Pacific (cores PS75/091, PS75/079, PS75/076, PS75/059, PS75/047 and PS75/046). In order to characterize the coccolithophore palaeoproductivity two independent proxies will be used: the Nannofossil Accumulation Rate (NAR) and the coccolith Sr/Ca ratio measured in different coccolith size fractions. In addition, the carbonate contribution of the main species Gephyrocapsa caribbeanica to the total pelagic carbonate production will be assessed and the carbonate dissolution quantified. All the information retrieved will allow us to evaluate if the coccolithophores modified the equilibrium of the inorganic carbon system during MIS 11 in the Pacific sector Southern Ocean.

该项目旨在获得对南大洋太平洋部分晚更新世间冰期海洋同位素阶段（MIS 11）的新见解，那里的信息很少。第11章（之间）424和374 kyr）是一个独特的异常长的间冰期，通常被认为是没有任何人为干扰的全新世的模拟。在此期间，在南半球高纬度地区观察到碳酸盐含量高的厚白色层。我们打算详细说明一个综合的，多参数的记录coccolithophore数据的MIS 11沉积物在R/V Polarstern ANT XXVI/2考察期间在极地南太平洋（核心PS 75/091，PS 75/079，PS 75/076，PS 75/059，PS 75/047和PS 75/046）。为了表征的颗石古生产力两个独立的代理将被使用：纳米化石积累率（NAR）和颗石Sr/Ca比在不同的颗石粒度级测量。此外，还将评估主要物种Gephyrocapsa caribbeanica对水层碳酸盐总产量的贡献，并对碳酸盐溶解进行量化。检索到的所有信息将使我们能够评估，如果颗石藻修改的无机碳系统的平衡在MIS 11在太平洋部门南大洋。