LGM Late Pleistocene to Holocene Glacial History of West Antarctica

LGM 晚更新世至全新世西部南极洲冰川历史

• 批准号: 9909734
• 负责人: John Anderson
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-15 至 2004-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909734&HistoricalAwards=false
• 关键词: LGM; Late; Pleistocene; Holocene; Glacial

9909734AndersonThis award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports research on the glaciomarine geology of the continental shelves of West Antarctica and the Antarctic Peninsula. It is hypothesized that the different glacial systems of the Antarctic Peninsula region have been more responsive to climate change and sea-level rise than either the West Antarctic or East Antarctic ice sheets. This is due mainly to the smaller size of these ice masses and the higher latitude location of the peninsula. Indeed, ice shelves of the Antarctic Peninsula are currently retreating at rates of up to a kilometer per year. But are these changes due to recent atmospheric warming in the region or are they simply the final phase of retreat since the last glacial maximum?This project hypothesizes that the deglacial history of the Antarctic Peninsula region has been quite complex, with different glacial systems retreating at different rates and at different times. This complex recessional history reflects the different sizes as well as different climatic and physiographic settings of glacial systems in the region. An understanding of the Late Pleistocene to Holocene glacial history of the Antarctic Peninsula glacial systems is needed to address how these systems responded to sea-level and climate change during that time interval. This investigation acquire new marine geological and geophysical data from the continental shelf to determine if and when different glacial systems were grounded on the shelf, to establish the extent of grounded ice, and to examine the history of glacial retreat. The project will build on an extensive seismic data set and hundreds of sediment cores collected along the Peninsula during earlier (1980's) cruises. Key to this investigation is the acquisition of swath bathymetry, side-scan sonar and very high-resolution sub-bottom (chirp) profiles from key drainage outlets. These new data will provide the necessary geomorphologic and stratigraphic framework for reconstructing the Antarctic Peninsula glacial record. Anticipated results will help constrain models for future glacier and ice sheet activity.

9909734安德森该奖项由极地计划办公室南极地质和地球物理计划提供，支持对南极洲西部大陆架和南极半岛的冰川海洋地质学的研究。据推测，南极半岛地区的不同冰川系统对气候变化和海平面上升的反应比西南极或东南极冰盖更敏感。这主要是由于这些冰块的尺寸较小和半岛的纬度较高。事实上，南极半岛的冰架目前正在以每年一公里的速度后退。但是，这些变化是由于该地区最近的大气变暖造成的，还是仅仅是自上一次冰川最大期以来的最后一个退缩阶段？该项目假设南极半岛地区的冰川消退历史相当复杂，不同的冰川系统在不同的时间以不同的速度消退。这种复杂的衰退历史反映了该地区冰川系统的不同规模以及不同的气候和地文背景。需要了解南极半岛冰川系统的晚更新世至全新世冰川历史，以解决这些系统如何在这段时间内对海平面和气候变化作出反应。这次调查从大陆架获取新的海洋地质和地球物理数据，以确定不同的冰川系统是否以及何时在大陆架上着陆，确定着陆冰的范围，并检查冰川退缩的历史。该项目将建立在一个广泛的地震数据集和数以百计的沉积物岩心收集沿着半岛在早期（1980年代）巡航。这项调查的关键是从主要排水口获取条带测深、侧扫声纳和非常高分辨率的海底（啁啾）剖面。这些新资料将为重建南极半岛冰川记录提供必要的地貌和地层框架。预期的结果将有助于约束未来冰川和冰盖活动的模型。