Short-term variability of sea ice and surface-water characteristic in the Late Neogene North Atlantic Ocean: A biomarker approach (IODP Leg 303 and 306)

新近纪晚期北大西洋海冰和地表水特征的短期变化：生物标记方法（IODP Leg 303 和 306）

• 批准号: 21459345
• 负责人: Professor Dr. Rüdiger Stein
• 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: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/21459345?language=en
• 关键词: Short; term; variability; sea; ice

Understanding the mechanisms and causes of abrupt climate change is one of the major challenges in global climate change research today. In this context, the paramount importance of the North Atlantic as a possible major driver of global climate change has to be mentioned. Thus, new IODP Leg 303/306 sites were drilled at key locations in the North Atlantic to extend the present knowledge of millennialscale climate variability over the last few million years. These sites will give the unique possibility for detailed studies of organic carbon and biomarker records as tools for high-resolution reconstruction of sea-ice cover, sea-surface temperature, sea-surface salinity, and sea-surface productivity, to be done within this project. The project is composed of two subprojects especially focussing on two aspects. (1) The determination of paleosalinity records and their correlation with Heinrich Events and related IRD and meltwater pulses. Within IRD-/Heinrich-type intervals, specific terrigenous biomarkers indicative for IRD sources will be quantified. (2) The highresolution reconstruction of biomarker-based paleotemperature and its relationships to environmental change. Applied methods include elemental analyses (TOC, C/N), Rock-Eval pyrolysis, biomarker studies using GC and GC/MS techniques, and stable carbon isotopes of the organic matter and of specific biomarkers.

了解气候突变的机制和原因是当今全球气候变化研究的主要挑战之一。在这方面，必须提到北大西洋作为全球气候变化的可能主要驱动力的极端重要性。因此，在北大西洋的关键地点钻取了新的IODP 303/306航段，以扩大目前对过去几百万年来千年尺度气候变化的了解。这些地点将为详细研究有机碳和生物标志物记录提供独特的可能性，作为高分辨率重建海冰覆盖、海面温度、海面盐度和海面生产力的工具，将在本项目范围内完成。该项目由两个子项目组成，特别侧重于两个方面。(1)古盐度记录的确定及其与Heinrich事件和相关IRD和融水脉冲的相关性。在IRD-/Heinrich型间隔内，将对指示IRD来源的特定陆源生物标志物进行量化。(2)基于生物标志物的古温度高分辨率重建及其与环境变化的关系。应用的方法包括元素分析（TOC、C/N）、岩石热解评价、使用GC和GC/MS技术的生物标志物研究、有机物和特定生物标志物的稳定碳同位素。