Retreat History of the West Antarctic Ice Sheet, Marie Byrd Land

9909778石头-该奖项是对两年资金的支持，以重建从最后一次冰川盛期到现在，沿着流经玛丽·伯德土地的福特山脉的流线的西南极冰盖的消退历史。该地区的冰面抬升历史将通过对克拉克、阿勒格尼和萨诺夫山脉的冰凌巨石和冰磨基岩表面的宇宙成因同位素暴露测年来重建。高程断面将确定这三个地点的冰盖变薄的时间，现在的冰面分别位于~1200米、~800米和200-400米。这项研究将产生玛丽·伯德土地的冰川消融年表，能够解决相互竞争的冰盖消退模型，并将为测试南极西部冰盖在冰川周期中的数值模型提供数据集。此外，这些结果将有助于限制西南极过去的冰负荷，从而有助于预测冰川均衡运动对该地区正在进行的大地测量的影响。

9909778StoneThis award is for support for two years of funding to reconstruct the retreat history of the West Antarctic ice sheet along a flowline through the Ford Ranges in Marie Byrd Land, from the last glacial maximum to present. The ice surface elevation history of the region will be reconstructed by cosmogenic isotope exposure dating of moraine boulders and ice-abraded bedrock surfaces in the Clark, Allegheny and Sarnoff Mountains. Altitude transects will date the thinning of the ice sheet at each of these three sites, where the present ice surface stands at ~1200 m, ~800 m and 200-400 m respectively. This research will produce a deglaciation chronology for Marie Byrd Land capable of resolving competing models of ice sheet retreat and will provide a data set for testing numerical models of the West Antarctic ice sheet through the glacial cycle. In addition, the results will help constrain the past ice load in West Antarctica and therefore help to predict the effect of glacioisostatic motion on geodetic surveys being carried out in the region.