Collaborative Research: Decoding & Predicting Antarctic Surface Melt Dynamics with Observations, Regional Atmospheric Modeling and GCMs

合作研究：解码

• 批准号: 1043580
• 负责人: David Reusch
• 金额: $ 25.41万
• 依托单位: New Mexico Institute of Mining and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-04-15 至 2016-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1043580&HistoricalAwards=false
• 关键词: Collaborative; Research; Decoding; & Predicting

The presence of ice ponds from surface melting of glacial ice can be a significant threshold in assessing the stability of ice sheets, and their overall response to a warming climate. Snow melt has a much reduced albedo, leading to additional seasonal melting from warming insolation. Water run-off not only contributes to the mass loss of ice sheets directly, but meltwater reaching the glacial ice bed may lubricate faster flow of ice sheets towards the ocean. Surficial meltwater may also reach the grounding lines of glacial ice through the wedging open of existing crevasses. The occurrence and amount of meltwater refreeze has even been suggested as a paleo proxy of near-surface atmospheric temperature regimes. Using contemporary remote sensing (microwave) satellite assessment of surface melt occurrence and extent, the predictive skill of regional meteorological models and reanalyses (e.g. WRF, ERA-Interim) to describe the synoptic conditions favourable to surficial melt is to be investigated. Statistical approaches and pattern recognition techniques are argued to provide a context for projecting future ice sheet change. The previous Intergovernmental Panel on Climate Change (IPCC AR4) commented on our lack of understanding of ice-sheet mass balance processes in polar regions and the potential for sea-level change. The IPPC suggested that the forthcoming AR5 efforts highlight regional cryosphere modeling efforts, such as is proposed here.

冰川冰表面融化的冰池的存在可能是评估冰盖稳定性以及它们对温暖气候的总体反应的重要阈值。雪融化的反照率大大减少，从而导致季节性融化导致温暖的暴发。水径流不仅导致冰盖的大规模损失，而且融水到达冰川冰床可能会更快地润滑冰盖流向海洋。表面融化的水可能还可以通过现有裂缝的楔入冰冰的接地线。甚至建议将融化的重新冷冻的发生和数量作为近地表大气温度方案的古代理。使用当代遥感（微波）卫星评估表面熔体的发生和程度，区域气象模型和重新分析的预测技能（例如WRF，ERA-Interim）描述了有利于表面熔体的概要条件。统计方法和模式识别技术被认为为预测未来的冰盖变化提供了背景。以前的政府间气候变化小组（IPCC AR4）评论了我们对极地地区冰上质量平衡过程的了解以及海平面变化的潜力。 IPPC建议即将举行的AR5工作强调了区域冰圈建模工作，例如这里提出的。