FEC for sailing participant on IODP Leg 318 (Wilkes Land glacial history)

为 IODP 第 318 段帆船参与者提供 FEC（威尔克斯地冰川历史）

基本信息

批准号：
NE/H025162/1
负责人：
Tina Van De Flierdt
金额：
$ 1.51万
依托单位：
Imperial College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FH025162%2F1
关键词：
FEC sailing participant IODP Leg

项目摘要

Understanding the evolution and dynamics of the Antarctic cryosphere, from its inception during the Eocene-Oligocene transition (~33 Ma) through the significant periods of climate change during the Cenozoic, is not only of major scientific interest but also is of great importance for society. The transition from Greenhouse to Icehouse Earth conceivably was the most significant step in large-scale planetary change, impacting global sea level, albedo, and oceanographic and biotic evolution, among other changes. State-of-the-art climate models combined with paleoclimatic proxy data suggest that the main triggering mechanism for initial inception and development of the Antarctic glaciation was the decreasing levels of CO2 concentration in the atmosphere. With current rising atmospheric greenhouse gases resulting in rapidly rising global temperatures, studies of polar climate, and the Antarctic cryosphere behaviour in particular, are prominent on the research agenda. Drilling the Antarctic Wilkes Land margin is designed to provide a long-term record, obtained from sedimentary archives along an inshore to offshore transect, of Antarctic glaciation and its intimate relationships with global climatic and oceanographic change. Stratigraphic interpretations indicate that the Wilkes Land record will include the critical periods in Cenozoic Earth climate evolution when the cryosphere formed, likely in step-wise fashion, and subsequently evolved to assume its present-day configuration. With my research I will help to tackle some of the fundamental goals of the research expedition: 1. The study of the first layer of ice-rafted debris will tell us about the timing and nature of the first arrival of ice at the Wilkes Land margin. 2. The study of ice-rafted debris over the past 34 million years will tell us about the transition of a fluctuating early East Antarctic ice sheet into a more stable East Antarctic ice sheet. It will also shed light on the important aspect of ice stability in times of warmer climatic periods. 3. The study of the seawater chemistry in the Southern Ocean over the past 34 million years will furthermore tell us how the build-up of the Antarctic ice sheet influenced ocean chemistry in this important part of the world's ocean. Linking this back to the extent of the ice sheet, prevailing continental weathering, and productivity in the ocean, will help us develop major links in the climate system.

了解南极冰冻圈的演化和动态，从始新世-渐新世过渡期（约 33 Ma）的开始到新生代气候变化的重要时期，不仅具有重大科学意义，而且对社会也具有重要意义。可以想象，从温室地球到冰室地球的转变是大规模行星变化中最重要的一步，影响着全球海平面、反照率、海洋和生物进化等变化。最先进的气候模型与古气候代理数据相结合表明，南极冰川最初发生和发展的主要触发机制是大气中二氧化碳浓度的降低。随着当前大气温室气体排放量的增加导致全球气温迅速上升，对极地气候，特别是南极冰冻圈行为的研究成为研究议程的重点。钻探南极威尔克斯陆地边缘的目的是从沿着近海到近海横断面的沉积档案中获得南极冰川作用及其与全球气候和海洋变化的密切关系的长期记录。地层学解释表明，威尔克斯地记录将包括新生代地球气候演化的关键时期，当时冰冻圈可能以逐步的方式形成，并随后演变为当今的形态。通过我的研究，我将帮助实现研究探险的一些基本目标： 1. 对第一层冰筏碎片的研究将告诉我们冰首次到达威尔克斯地边缘的时间和性质。 2. 对过去 3400 万年冰筏碎片的研究将告诉我们早期东南极冰盖波动向更稳定的东南极冰盖的转变。它还将揭示气候变暖时期冰稳定性的重要方面。 3. 对过去3400万年南大洋海水化学的研究将进一步告诉我们南极冰盖的形成如何影响世界海洋这一重要部分的海洋化学。将其与冰盖范围、普遍的大陆风化和海洋生产力联系起来，将有助于我们发展气候系统中的主要联系。