Pliocene North Atlantic water mass distribution and Meridional Overturning Circulation, 3.3 - 3.0 Ma

上新世北大西洋水团分布和经向翻转环流，3.3 - 3.0 Ma

• 批准号: 180142209
• 负责人: Dr. Nabil Khélifi
• 金额: --
• 依托单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/180142209?language=en
• 关键词: Pliocene; North; Atlantic; water; mass

The project proposed here focuses on changes in the North Atlantic Meridional Overturning Circulation (MOC) and aims to provide a detailed reconstruction of intermediate and deep water mass distribution and circulation in the North Atlantic over the most recent global warm period in the Pliocene (~3.3–3.0 Ma ago; the mid-Piacenzian). During this 300 000 year interval, global temperature was ~3°C warmer than today, which has been predicted to be reached before the end of this century due to anthropogenic climate change. The mid-Piacenzian is considered to be one of the closest and the most recent analog for future global climate. It is thus uniquely suited for a case study with the goal to better understand the oceanographic and climatic processes controlling and responding to the global warming. On the basis of 5 core transects in the North Atlantic, we propose (1) to constrain the water-mass composition and flow patterns, and (2) to assess changes of North Atlantic deep and intermediate water circulation over the Upper Pliocene warm period. This systematic approach will help to more accurately evaluate the past variability of the North Atlantic MOC and its effects on climate under environmental conditions similar to our near future.

本文以北大西洋经向翻转环流（MOC）的变化为研究对象，详细重建了上新世（~3.3 ~ 3.0 Ma前；中皮亚琴世）最近全球变暖时期北大西洋中深水质量分布和环流。在这30万年的时间间隔中，全球温度比今天高~3°C，由于人为气候变化，预计在本世纪末之前将达到这一温度。中皮亚琴世被认为是对未来全球气候最接近和最新的模拟之一。因此，它特别适合于一个案例研究，目的是更好地了解控制和应对全球变暖的海洋和气候过程。在北大西洋5个核心样带的基础上，提出了(1)约束水体组成和水流模式的方法；(2)评估上上新世暖期北大西洋深层和中层水循环的变化。这种系统的方法将有助于更准确地评估北大西洋MOC过去的变率及其在类似于我们不久的将来的环境条件下对气候的影响。