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Ice-water interactions in the sublacial Lake Vostok, Antarctica: numerical simulations

南极洲沃斯托克湖冰水相互作用：数值模拟

基本信息

批准号：
5455970
负责人：
Dr. Christoph Mayer
金额：
--
依托单位：
Sektion Paläoklimadynamik
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2005
资助国家：
德国
起止时间：
2004-12-31 至 2008-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/5455970?language=en
关键词：
Ice water interactions sublacial Lake

项目摘要

The investigation of subglacial Antarctic lakes like Lake Vostok is a central goal of the SCARSALE initiative during IPY. Within this program paleo-climate record analyses, technological advances in subglacial lake access, and investigations on hydrological/limnological conditions in subglacial environments are gathered. Our project contributes with modelling efforts to these topics and yields estimates of probable lake conditions and sensitivities of the environment to changes in their setting and composition. After a delay in getting started, technical developments of the lake model, such as investigations on mixing parametrisation on the flow regime have been completed to its major part. Sensitivity studies regarding the geothermal heat flux and the salt content of the lake reveal a quite stable flow pattern, which only varies within certain limits. Only a twofold increase in salinity than estimated from ice core data yields changes hi circulation pattern and basal mass balance. These results and additional numerical experiments in progress will lead to a standard model setup, which will in the requested project phase be used to investigate the impact of drainage water on the lake system due to subglacial connection of Antarctic lakes, the isotopic composition of the lake, probable bio-geochemical lake conditions, and the impact of the basal mass balance on the overlying ice sheet dynamics.

对南极冰下湖泊（如东方湖）的调查是国际极地年期间SCARSALE倡议的中心目标。在该计划中，收集了古气候记录分析、冰下湖泊通道的技术进步以及冰下环境水文/湖沼条件的调查。我们的项目有助于这些主题的建模工作，并产生可能的湖泊条件和环境对其设置和组成变化的敏感性的估计。在开始延迟之后，湖泊模型的技术开发，例如对流态混合参数化的研究，已经完成了其主要部分。关于地热通量和湖的含盐量的敏感性研究揭示了一个相当稳定的流动模式，它只在一定范围内变化。只有两倍的盐度增加比估计从冰芯数据产生的变化在循环模式和基础质量平衡。这些结果和正在进行的其他数值实验将导致一个标准模型的建立，在所要求的项目阶段，该模型将用于调查由于南极湖泊的冰下连接而导致的排水对湖泊系统的影响、湖泊的同位素组成、可能的生物地球化学湖泊条件以及基底物质平衡对覆盖冰盖动态的影响。