High Resolution Radar Profiling of the Snow and Ice Stratigraphy beneath the ITASE Traverses, West Antarctic Ice Sheet

南极西部冰盖 ITASE 横断面下方冰雪地层的高分辨率雷达剖面图

• 批准号: 0088035
• 负责人: Steven Arcone
• 金额: $ 3.32万
• 依托单位: Department of Army Cold Regions Research & Engineering Lab
• 依托单位国家: 美国
• 项目类别: Interagency Agreement
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0088035&HistoricalAwards=false
• 关键词: Resolution; Radar; Profiling; Snow; Ice

0088035 ArconeThis award supports continued acquisition of high resolution, radar reflection profiles of the snow and ice stratigraphy between core sites planned along traverse routes of the U.S. component of the InternationalTrans-Antarctic Scientific Expedition (U.S.-ITASE). The purpose is to use the profiles to establish the structure and continuity of firn stratigraphic horizons over hundreds of kilometers and to quantitativelyassess topographic and ice movement effects upon snow deposition. Other objectives are to establish the climatic extent that a single site represents and to investigate the cause of firn reflections. The radarwill also be used to identify crevasses ahead of the traverse vehicles in order to protect the safety of the scientists and support personnel on the traverse. Collaboration with other ITASE investigators will use the radar horizons as continuous isochronic references fixed by the core dating to calculate historical snow accumulation rates. The primary radar system uses 400-MHz (center frequency) short-pulse antennas, which (with processing) gives the penetration of 50-70 meters. This is the depth which is required to exceed the 200-year deposition horizon along the traverse routes. Profiles at 200 MHz will also be recorded if depths greater than 70 meters are of interest. Processing will be accomplished by data compression (stacking) to reveal long distance stratigraphic deformation, range gain corrections to give proper weight to signal amplitudes, and GPS corrections to adjust the records for the present ice sheet topography. Near surface stratigraphy will allow topographic and ice movement effects to be separated. This work is critical to the success of the U.S.-ITASE program.

0088035 ArconeThis award supports continuing acquisition of high resolution，radar reflection profile of snow and ice stratigraphy between core site planned沿着traversing routes of the United States. component of the InternationalTrans-Antarctic Scientific Expedition（U.S.- ITASE）。 其目的是利用剖面图建立数百公里范围内的积雪地层的结构和连续性，并定量评估地形和冰运动对雪沉积的影响。 其他目标是建立一个单一的网站代表的气候范围，并调查积雪反射的原因。 该雷达还将用于识别导线车前方的裂缝，以保护科学家和导线支持人员的安全。 与其他ITASE研究人员合作，将使用雷达地平线作为由岩心定年法确定的连续等时参考，以计算历史上的积雪速度。 一次雷达系统使用400 MHz（中心频率）短脉冲天线，其（经过处理）可提供50-70米的穿透力。 这是沿沿着导线路线超过200年沉积层位所需的深度。 如果深度大于70米，也将记录200兆赫的剖面。 处理将通过数据压缩（叠加）来完成，以揭示长距离地层变形，距离增益校正以给予信号幅度适当的权重，以及GPS校正以调整当前冰盖地形的记录。 近地表地层学将使地形和冰运动的影响分开。 这项工作对美国的成功至关重要- ITASE程序。