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.

了解突然气候变化的机制和原因是当今全球气候变化研究的主要挑战之一。在这种情况下，必须提到北大西洋作为全球气候变化的主要驱动力的至关重要。因此，在北大西洋的主要地点钻了新的IODP腿303/306个地点，以扩展过去几百万年的千禧年气候变化的当前知识。这些地点将为有机碳和生物标志物记录详细研究提供独特的可能性，作为在此项目中可以完成海冰覆盖，海冰温度，海面盐度和海面生产率的高分辨率重建的工具。该项目由两个副标题组成，尤其是专注于两个方面。 （1）确定紫色记录及其与海因里希事件以及相关的IRD和融合脉冲的相关性。在IRD/Heinrich型间隔内，将量化特定的IRD来源的特异性陆源生物标志物。 （2）基于生物标志物的古温及其与环境变化的关系的高分辨率重建。应用的方法包括元素分析（TOC，C/N），岩石源性热解，使用GC和GC/MS技术的生物标志物研究以及有机物和特定生物标志物的稳定碳同位素。