Sediment-Laden Sea Ice in the Eurasian Arctic: Sediment Sources, Ice Floe Development, and Its Impact on Climate

1987-1989年欧亚北极海冰高沉积物含量观测对冰融化、冰模拟和古环境重建的影响提出了问题。在1990年和1991年期间，建议通过确定沉积物的来源、检查含沙浮冰的发展和评估海冰中沉积物包裹体对气候的影响来调查海冰的沉积物运输。沉积物的来源将通过比较欧亚大陆西部北极海冰的现有沉积物样本与西伯利亚海海底沉积物的分析来确定。根据西伯利亚陆架海域的LANDSAT图像，将评估春季崩解期间河流排放的泥沙结合和沿海沙尘暴的风沙输送。此外，还将破译携带沉积物的多年浮冰的历史和发展。在不同的环境情景下，将使用一个耦合的能量平衡气候-海冰模式来估计含沙海冰的潜在气候影响，该模式包含了Ledley和Thompson（1986）使用的“脏”包裹体对冰雪反照率影响的参数化的修改版本。

Observations in 1987-1989 of Eurasian Arctic sea ice with high sediment content raise questions of consequences for ice melting, ice modeling, and paleoenvironmental reconstructions. During 1990 and 1991 it is proposed to investigate sediment transport by sea ice by identifying the sources of the sediment, examining the development of sediment-laden floes and assessing the climatic impact of sediment inclusions in sea ice. The sediment sources will be identified by comparing existing sediment samples from western Eurasian Arctic sea ice floes to analyses of sea floor sediment from the Siberian Seas. Sediment incorporation by river discharge during spring breakup, and aeolian transport by costal dust storms will be assessed based on LANDSAT imagery of the Siberian shelf seas. In addition, the history and development of sediment-laden multi-year floes will be deciphered. The potential climatic impact of sediment-laden sea ice within the context of varying environmental scenarios will be estimated using a coupled energy balance climatic-sea ice model, which incorporates a modified version of the parameterization of the effect of "dirty" inclusions on snow and ice albedo used in Ledley and Thompson (1986).