MAGIC-DMLMeasuring/Mapping/Modeling Antarctic Geomorphology and Ice Change in Dronning Maud Land: The German ice sheet modeling component

MAGIC-DMLM 测量/绘图/建模 Dronning Maud 地的南极地貌和冰层变化：德国冰盖建模组件

• 批准号: 365737614
• 负责人: Dr. Matthias Prange, since 8/2020
• 金额: --
• 依托单位: Fachgebiet Geosystem-Modellierung
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/365737614?language=en
• 关键词: MAGIC; DMLMeasuring; Mapping; Modeling; Antarctic

This proposal presents the core modeling component of the international collaborative project MAGIC-DML linking researchers from Sweden, USA, Germany, UK, and Norway. MAGIC-DML overall focuses on reconstructing the long-term pattern and timing of ice-surface elevation changes across Dronning Maud Land (DML) in the East Antarctic Ice Sheet (EAIS). The modeling component of MAGIC-DML will combine past ice elevations across DML determined by field mapping and cosmogenic dating of glacial landforms on nunataks with data from other areas in East Antarctica and high-resolution ice sheet modeling to provide insights into EAIS changes and long-term regional climate evolution. Our numerical experiments will test a large number of climate model products in order to evaluate the following hypotheses:- The inland sectors of the EAIS have experienced long-term reductions in ice-surface elevation since the Pliocene;- The ice sheet last retreated from its maximum extent in DML after 25 thousand years ago (ka), at which time the ice surface was hundreds of meters higher near the coast, but no higher and perhaps lower across most of continental East Antarctica.An approach combining ice sheet modeling with field evidence and climate model reconstructions will set a limit on a relative contribution of the EAIS to past sea level variations and reduce large uncertainties in past climate conditions across Antarctica. As part of this, we will quantify the response of the EAIS margin to warmer-than-present climate conditions, such as inferred for the Pliocene and Marine Isotope Stages 11c (420 - 400 ka) and 5e (124 - 119 ka), providing analogs for the EAIS response to anticipated future climate warming.

该建议提出了核心建模组件的国际合作项目MAGIC-DML连接来自瑞典，美国，德国，英国和挪威的研究人员。MAGIC-DML总体上侧重于重建东南极冰盖（EAIS）中整个德龙宁毛德地（DML）的冰面高程变化的长期模式和时间。MAGIC-DML的建模组件将结合联合收割机通过冰原岛峰冰川地貌的实地测绘和宇宙生成年代测定确定的DML上过去的冰高程，以及来自东南极洲其他地区的数据和高分辨率冰盖建模，以深入了解EAIS变化和长期区域气候演变。我们的数值实验将测试大量的气候模式产品，以评估以下假设：-自上新世以来，EAIS的内陆部分经历了冰面高程的长期降低;- 冰盖最后一次从DML的最大范围撤退是在2.5万年前（ka），当时冰面在海岸附近高出数百米，但在东南极洲大陆的大部分地区，并没有更高，也许更低。一种将冰盖模拟与实地证据和气候模式重建相结合的方法将限制EAIS对过去海平面变化的相对贡献，并减少过去气候条件的巨大不确定性。南极洲作为其中的一部分，我们将量化EAIS边缘对比现在温暖的气候条件的响应，例如上新世和海洋同位素阶段11 c（420 - 400 ka）和5e（124 - 119 ka）的推断，为EAIS对预期未来气候变暖的响应提供类似物。