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

欧亚北极富含沉积物的海冰：沉积物来源、浮冰发展及其对气候的影响

• 批准号: 8922426
• 负责人: Stephanie Pfirman
• 金额: --
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1990-11-22
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922426&HistoricalAwards=false
• 关键词: Sediment; Laden; Sea; Ice; Eurasian

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).

1987-1989年欧亚北极海冰的观测 泥沙含量高， 冰融化、冰模拟和古环境 重建。 在1990年和1991年期间，建议 研究海冰的沉积物输送， 沉积物的来源，审查的发展， 的气候影响和评估 海冰中的沉积物包裹体。 沉积物来源将通过比较 欧亚北冰洋西部现有沉积物样品 从浮冰到海底沉积物的分析 西伯利亚海 河流流量泥沙掺入 在春季解体期间， 风暴将根据陆地卫星图像进行评估， 西伯利亚陆架海。 此外，历史和 多年沉积物的发展将是 解密 载有沉积物的海冰的潜在气候影响 在不同的环境情景下， 使用气候-海冰耦合能量平衡进行估算 模型，其中包括一个修改后的版本， “脏”夹杂物对雪影响的参数化 以及Ledley和Thompson（1986）中使用的冰藻。