Basal glacial melting and its contribution to bottom water formation and ocean circulation in the Antarctic continental margins under changing environmental conditions.

环境条件变化下基底冰川融化及其对南极大陆边缘底水形成和海洋环流的贡献。

基本信息

批准号：
256165858
负责人：
Dr. Oliver Huhn
金额：
--
依托单位：
Abteilung Ozeanographie
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/256165858?language=en
关键词：
Basal glacial melting its contribution

项目摘要

In the Weddell Sea, the actual state of basal ice shelf melting, its variability and possible future trends due to changing climate conditions are not yet fully understood. To study and to understand its impact on the Antarctic Bottom Water composition and formation rate and related variability as well as the impact on the global ocean circulation more tracer observations are urgently needed. The aims of the proposed project are:A) To produce an improved actual estimate of basal glacial melt water inventories and basal melting rates for the ice shelves in the western (Larsen Ice Shelf) and southern Weddell Sea (Filchner Ice Shelf) to be able to address temporal trends in the futureB) To trace the pathways of the basal melt water, how it contributes to local Antarctic Bottom Water formation, and to quantify the related actual Antarctic Bottom Water formation rates.C) To investigate, if there is evidence for local shifts or temporal trends in glacial melting processes and related Antarctic Bottom Water formation. Possible changes could be related to changes in the ice shelves, as Larsen A, B are now ice free, in contrast to Larsen C and Filchner, which both are still ice covered, or to changing properties or circulation of ambient water masses.D) To assess, how local processes and their variability are related to basin wide or global scales (e.g. observed basin wide Antarctic Bottom Water property changes, warming, freshening, age increase and declining ventilation, slow down anthropogenic carbon uptake, declining volumes, trends).Tracer observations will help substantially to investigate and quantify basal glacial melting (stable noble gas isotopes [3He, 4He, Ne] to quantify basal glacial melt water inventories), basal melt rates and Antarctic Bottom Water formation (transient trace gases [CFCs] to determine transit time scales [TTDs], formation rates, and the related anthropogenic carbon uptake) and their variability.These objectives contribute to three major goals of the SPP 1158:* Dynamics of the Climate System Components* Response to Environmental Change* (The Weddell Sea as a) Gateway to Lower Latitudes

在Weddell海中，基底冰架融化的实际状态，由于气候条件变化而引起的变异性和可能的未来趋势尚未完全了解。要研究并了解其对南极底部水成分和形成率以及相关变异性以及对全球海洋循环的影响的影响，迫切需要更多的示踪观测。拟议项目的目的是：a）对西方（Larsen Ice搁板）和南部韦德尔海（Filchner Ice架）的冰架的基础融化水清单和基础融化速率进行改进的实际估计，以便能够在未来的时间范围内供应量子量的量化量的相关型号，从而可以解决量子的水平趋势，从而追踪量子的实际级别，以供量子级别的水。南极底水率。 Possible changes could be related to changes in the ice shelves, as Larsen A, B are now ice free, in contrast to Larsen C and Filchner, which both are still ice covered, or to changing properties or circulation of ambient water masses.D) To assess, how local processes and their variability are related to basin wide or global scales (e.g. observed basin wide Antarctic Bottom Water property changes, warming, freshening, age increase and declining ventilation, slow down追踪观察结果将有助于调查和量化基础冰川融化（稳定的贵重气体同位素[3HE，4HE，NE]来量化基础冰川熔体清单），基础熔体的速率和瞬时水平（COFC）[CFC [CFC）[CFC [CFC] [CFC [CFC）[CFC [CFC稳定[3HE，4HE，NE] [CFC [CFC）[CFC [CFC稳定[3HE，4HE，NE] [CFC [CFC）[3HE，4HE，NE] [CFC [CFC）[3HE，4HE，NE]将有助于基础融化（3HE，4HE）[稳定的贵气体同位素[CFC）形成率，以及相关的人为碳的吸收）及其可变性。这些目标促成了SPP 1158的三个主要目标：*气候系统组件的动力学*对环境变化的响应*（Weddell Sea作为一个通往较低纬度的网关）