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

1987-1989年对高沉积物含量的欧亚北极海冰的观测提出了关于冰融化、冰模拟和古环境重建的后果的问题。在1990-1991年期间，有人建议通过确定沉积物的来源、检查含沙浮标的发育和评估海冰中沉积物包裹体的气候影响来研究海冰的沉积物输运。将通过比较来自欧亚大陆西部北极海冰的现有沉积物样本与来自西伯利亚海的海底沉积物分析来确定沉积物来源。将根据西伯利亚陆架海的陆地卫星图像，评估春季解体期间河流排出的沉积物并入以及沿海沙尘暴造成的风沙输送。此外，还将解密载沙多年浮标的历史和发展。将使用能量平衡气候-海冰耦合模式估计不同环境情景下含沉积物的海冰的潜在气候影响，该模式包含了Ledley和Thompson(1986)使用的“脏”包裹体对雪和冰反照率影响的参数化的修正版本。

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).