Assessment of the natural perchlorate source using perchlorate history from Greenland ice cores.

利用格陵兰冰芯的高氯酸盐历史评估天然高氯酸盐来源。

• 批准号: 1203533
• 负责人: Jihong Cole-Dai
• 金额: $ 26.75万
• 依托单位: South Dakota State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1203533&HistoricalAwards=false
• 关键词: Assessment; natural; perchlorate; source; using

Perchlorate is a long-lived environmental contaminant, released from human activities but increasingly recognized to have a natural source as well. The investigators propose to measure perchlorate in previously-collected Greenland ice cores, with the following specific objectives:1. To obtain a robust (continuous and annual resolution) 500-year record of perchlorate in the environment using ice core samples from Greenland2. To quantify the magnitude and variability of the natural, probably atmospheric perchlorate source in the Northern Hemisphere environment using the pre-1850 part of the record3. To estimate the relative contributions of natural and anthropogenic sources to perchlorate in the current environment, and 4. To evaluate the impact of specific human activities (e.g., space applications) by a close examination of the perchlorate record during specific time periods (e.g., pre- and post-1950s).The project will involve the application of a new method to measure extremely low concentrations of perchlorate in polar ice. Achievement of the main objective can lead to improvement of our understanding of the natural formation process of environmentally important substances. Results of this work may inform decision-making regarding the regulation of perchlorate release into the environment. The project will involve both graduate and undergraduate student participants and contribute to an environmental outreach program between South Dakota State University and K-12 schools in South Dakota.

高氯酸盐是一种长期存在的环境污染物，由人类活动释放，但越来越多地被认为也有自然来源。研究人员建议测量先前收集的格陵兰冰芯中的高氯酸盐，具体目标如下：1。使用格陵兰冰芯样本获得环境中高氯酸盐的500年可靠记录（连续和年度分辨率）2。利用1850年以前的部分记录，量化北方半球环境中天然的、可能是大气中的高氯酸盐来源的量级和变化性3。估算当前环境中自然源和人为源对高氯酸盐的相对贡献。评估特定人类活动的影响（例如，空间应用）通过在特定时间段内仔细检查高氯酸盐记录（例如，该项目将采用一种新方法来测量极地冰中极低浓度的高氯酸盐。主要目标的实现可导致我们对环境重要物质的自然形成过程的理解的提高。这项工作的结果可能会告知决策有关监管高氯酸盐释放到环境中。该项目将涉及研究生和本科生的参与者，并有助于南达科他州州立大学和南达科他州的K-12学校之间的环境推广计划。