ISTAR-D - The contribution to sea-level rise of the Amundsen Sea sector of Antarctica

ISTAR-D - 南极洲阿蒙森海区对海平面上升的贡献

• 批准号: NE/J005681/2
• 负责人: Andrew Shepherd
• 金额: $ 13.45万
• 依托单位: Northumbria University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FJ005681%2F2
• 关键词: ISTAR; contribution; sea; level; rise

This proposal will resolve the differences between satellite altimeter, SAR and gravity estimates of the mass imbalance of the Amundsen sector ice streams, through exploiting surface observations of accumulation, density and solid Earth motion made on the ISAR-D traverses in 2012/3 and 2013/4 of the Pine Island basin, and the wider BAS logistics from 2013 to 2016. In particular, it will:The objectives of this proposal are:1. Determine, at deep cores at some 10 sites along an 850 km traverse throughout the Pine Island Basin, the inter-annual, decadal, and ~ 50 year average accumulation. 2. Determine, using shallow access holes at some 50 sites along the traverse, the annual fluctuations of accumulation and near surface density over the past ~ 15 years. 3. Interpolate along the traverse the spatial variation in accumulation using surface-dragged accumulation radar measurements, and the annual fluctuations of accumulation and near surface density, using airborne radar measurements. 4. Determine the motion of the solid Earth, and millennial-scale ice sheet elevation history, at 3 nunatak sites in the interior of the Pine Island Basin.5. Evaluate the accuracy of accumulation and densification forecast models using the inter-decadal, fluctuation measurements, and more sophisticated densification models, and use the combination to best estimate the fluctuations of accumulation and density over the past ~ 20 years in the Amundsen Sea sector and beyond. 6. Use a West Antarctic ice history model, based on exposure dates, with other observations, to best estimate the solid Earth motion of the Amundsen sea-sector, and use the measurements of crustal motion to test this.7. Determine the contributions of accumulation and density fluctuations, and solid Earth motion, to altimetric and gravity satellite estimates of the mass balance of the Amundsen sector, and reassess the SAR-based estimates of mass balance in the light of the new accumulation and measurements.8. Best estimate the mass balance, and its change in time, of the Amundsen sector basins.These objectives answer directly to the objectives of the ISTAR-D Announcement of Opportunity, in that they will result in the determination of the spatial and temporal variability of the regions mass imbalance, and, inter alia, quantify the uncertainties associated with the satellite estimates. More widely, they answer to an identified priority of the NERC Polar Strategy, "Ice sheets and Sea Level Rise", and to challenges of the NERC Climate and Earth System Science themes.

该建议将通过利用2012/3和2013/2013/2013/2012/2013年派恩岛盆地的伊萨尔 - d travers在2012/3和2013/2013年的伊萨尔·d travers上的表面观察来解决卫星高度计，SAR和重力估算之间的差异，SAR和重力估算的量之间的差异。确定在整个松树盆地沿着850公里的大约10个地点的深层岩心下，年际，十年型和约50年的平均积累。 2。确定，在过去的大约15年中，使用沿遍及的大约50个地点的浅访问孔，累积的年度波动和接近表面密度。 3。使用表面拖动的累积雷达测量值以及使用空中雷达测量值沿遍历遍历的空间变化，并使用表面拖动的累积雷达测量值以及每年的积累和近表面密度的波动。 4。确定在派恩岛盆地内部的3个Nunatak地点，确定地球的运动，以及千禧一代的冰盖海拔历史。5。评估使用少年间，波动测量和更复杂的致密化模型的积累和致密性预测模型的准确性，并利用该组合在Amundsen Sea部门及以后的过去约20年来最佳估计积累和密度的波动。 6。根据暴露日期和其他观察结果，使用南极西部冰历史模型最好地估计Amundsen Sea区的固体地球运动，并使用地壳运动的测量结果来测试。7。确定积累和密度波动的贡献，以及固体地球运动对阿蒙森部门质量平衡的高度和重力卫星估计的估计，并根据新的积累和测量值重新评估基于SAR的质量平衡的估计值8。最好估计阿蒙森部门盆地的质量平衡及其时间的变化。这些目标直接回答了ISTAR-D公告的机会的目标，因为它们将导致确定区域质量不平衡的空间和时间变化，并量化与卫星估计相关的不确定性。更广泛地说，他们回答了NERC极地战略，“冰盖和海平面上升”的优先级，以及NERC气候和地球系统科学主题的挑战。