Persistent organic pollutants as proxies for the quantification of glacier melting on the Tibetan Plateau

持久性有机污染物作为青藏高原冰川融化量化的替代指标

• 批准号: 180325907
• 负责人: Dr. Tilman Gocht
• 金额: --
• 依托单位: Institute of Tibetan Plateau Research
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/180325907?language=en
• 关键词: Persistent; organic; pollutants; proxies; quantification

Persistent organic pollutants (POPs) are toxic chemicals that are ubiquitously distributed in the environment. Some of these pollutants are suspected to accumulate preferentially in cold environments due to enhanced atmospheric deposition. In cold environments accumulation of POPs occurs primarily in two compartments: (1) in soils and sediments and (2) in glaciers. Subsequent to deposition the compounds remain stable and become incorporated into the respective compartments due to continuous sedimentation of fresh material (snow or sediments, respectively) allowing the reconstruction of their historical record. However, both compartments are connected through melt water and global warming forces glacier melting. Hence, the release of POPs stored in the glaciers potentially impacts the historical record of POPs in glacier-fed lakes.In the proposed project we investigate the historical record of POPs in glacier-fed lake sediments at the Tibetan Plateau in order to assess the role glaciers as a secondary source for POPs. This will serve as preliminary work for a full proposal aiming on the quantification of recent glacier melting through the determination of POP fuxes.

持久性有机污染物（POP）是环境中普遍分布的有毒化学物质。由于大气沉降增强，其中一些污染物被怀疑在寒冷环境中优先积聚。在寒冷环境中，持久性有机污染物的积累主要发生在两个区域：(1) 土壤和沉积物中，(2) 冰川中。沉积后，由于新鲜材料（分别为雪或沉积物）的连续沉积，化合物保持稳定并并入各自的隔室中，从而可以重建其历史记录。然而，这两个部分通过融水相连，全球变暖迫使冰川融化。因此，储存在冰川中的持久性有机污染物的释放可能会影响冰川湖泊沉积物中持久性有机污染物的历史记录。在本项目中，我们调查了青藏高原冰川湖泊沉积物中持久性有机污染物的历史记录，以评估冰川作为持久性有机污染物次要来源的作用。这将作为旨在通过确定持久性有机污染物通量来量化近期冰川融化的完整提案的初步工作。