Organic trace analysis of atmospheric marker species in ice cores

冰芯中大气标记物种的有机痕量分析

• 批准号: 421860192
• 负责人: Professor Dr. Thorsten Hoffmann
• 金额: --
• 依托单位: Laboratory of Biomolecular Research (LBR)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/421860192?language=en
• 关键词: Organic; trace; analysis; atmospheric; marker

To place recent environmental and climatic changes in a longer-term context, and to disentangle anthropogenic and natural sources of the particulate burden of the atmosphere, information on past atmospheric conditions is necessary. Ice cores from polar regions and mid-latitude cold glaciers are valuable environmental archives, as they preserve past atmospheric aerosol deposited with snowfall. Hence, the analysis of aerosol-related chemical compounds in ice core samples can give information on past environmental and climatic conditions. Most studies have focused on inorganic aerosol-related parameters and just a few organic compounds. Thus, a wealth of information remains uncollected and a characterization of a larger fraction of the organic material present in ice and snow is highly desirable. This reflects the major goal of the project, the development of organic trace analytical methodologies based on LC-HRMS to measure an array of organic compounds, focusing on new biogenic SOA and biomass burning markers. The choice of appropriate marker molecules is based on the potential information content to reveal certain characteristics about their respective sources, i.e. terrestrial ecosystems and vegetation fires, and on their atmospheric lifetime, enabling transport also to remote regions. In addition to these targeted analytes also non-target screening will be performed. In close cooperation with a well-established ice core laboratory at the PSI in Switzerland the developed analytical techniques will be applied to an ice core from the Belukha glacier in the Siberian Altai.

为了把最近的环境和气候变化放在较长期的背景下考虑，并弄清大气中微粒负担的人为来源和自然来源，关于过去大气条件的资料是必要的。来自极地和中纬度寒冷冰川的冰芯是宝贵的环境档案，因为它们保存了过去随降雪沉积的大气气溶胶。因此，对冰芯样品中气溶胶相关化合物的分析可以提供有关过去环境和气候条件的信息。大多数研究都集中在无机气溶胶的相关参数上，只有少数有机化合物。因此，大量的信息仍未被收集，对冰雪中存在的更大一部分有机物质的表征是非常需要的。这反映了该项目的主要目标，即开发基于LC-HRMS的有机痕量分析方法来测量一系列有机化合物，重点关注新的生物源SOA和生物质燃烧标记物。选择合适的标记分子是基于潜在的信息含量，以揭示它们各自来源的某些特征，即陆地生态系统和植被火灾，以及它们的大气寿命，从而也能够运输到偏远地区。除了这些目标分析物外，还将进行非目标筛选。在与瑞士PSI的一个完善的冰芯实验室密切合作下，将把开发的分析技术应用于西伯利亚阿尔泰Belukha冰川的冰芯。