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| Insight into the Precambrian oceans from a biogeochemical study of a present-day analog: the lake Dzinai Dzaha, Mayotte. | |
| 项目编号 | ANR-13-BS06-0001 |
| Madame magali ADER | |
| 项目主持机构 | Institut de Physique du Globe de Paris |
| 开始日期 | 2014 |
| 结束日期 | 2018-1-01 |
| 英文摘要 | The formation of light-absorbing organic compounds (LOC) in secondary organic aerosols (SOA) can alter the optical properties of atmospheric fine particulate matter (sub-micrometer particles). Nitrogen-containing heterocyclic compounds, produced by reactions between reactive carbonyl species and amine compounds following an imine pathway, are subject of recent research activities concerning this topic. In contrast to local emissions by combustion sources, which are known to emit light-absorbing particles into the atmosphere, this process potentially occurs throughout the Troposphere, affecting its radiation budget on a global scale. Currently, knowledge of the involved reactants, reaction mechanisms, kinetics, and yields is limited to a small number of laboratory studies. This project aims to improve the fundamental process understanding and to quantitatively investigate the kinetic aspects of it. In addition, the number of classes of investigated carbonyl species will be extended. In systematic studies, products will be identified, and molecular absorptivity of key reaction products as well as reaction kinetics will be investigated. Therefore, bulk solution experiments will be conducted, mimicking the composition of atmospheric particulates over different regions, i.e., the Amazonian rain forest, central Europe, and northern India. Reaction rates will be determined and interpreted in terms of their relevance for atmospheric processes by applying a kinetic multilayer model for aerosol surface and bulk chemistry to the experimental data. Kinetic modeling results will be evaluated by model aerosol experiments. Further, a new method for the analysis of the most promising marker compounds in ambient aerosol samples will be developed and applied to ambient samples, which will be collected in the previously mentioned regions. To achieve these goals, state-of-the-art chromatographic, spectro-photometric, and mass spectrometric methods will be used. These methods will provide information about product identities (exact masses, ion fragmentation patterns) and absorption properties on a molecular level. The comprehensive investigations during this project will comprise laboratory experiments, numerical modeling studies, and the analysis of ambient aerosol samples. The new insights gained during this project will help to improve our understanding of how the chemistry in the atmospheric particle-phase affects the optical properties of aerosols and thus their climate effect. Additionally, a high abundance of the anticipated reaction products in source regions might be associated with the adverse health effects observed for aerosols in highly polluted areas. |
| 资助机构 | FR-ANR |
| 项目类型 | Blanc - SIMI 6 - Système Terre, environnement, risques (Blanc SIMI 6) 2013 |
| URL | http://www.agence-nationale-recherche.fr/en/anr-funded-project/?solr=run&tx_lwmsuivibilan_pi2%5BCODE%5D=ANR-13-BS06-0001 |
| 国家 | FR |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/74772 |
| 推荐引用方式 GB/T 7714 | Madame magali ADER.Insight into the Precambrian oceans from a biogeochemical study of a present-day analog: the lake Dzinai Dzaha, Mayotte..2014. |
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