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| TIDAL WETLANDS AS SOURCES AND SINKS OF CARBON IN A CHANGING WORLD: REMOTE SENSING, MEASUREMENTS AND MODELING OF WETLAND-OCEAN-ATMOSPHERE INTERACTIONS | |
| 项目编号 | NNX14AJ88G |
| PATRICK NEALE | |
| 项目主持机构 | SMITHSONIAN INSTITUTION |
| 开始日期 | 2014-06-23 |
| 结束日期 | 2018-06-22 |
| 英文摘要 | The atmospheric oxidation of Biogenic Volatile Organic Compounds (BVOC), emitted by vegetation, is thought to contribute substantially to the rapid growth of newly formed particles to cloud nucleating sizes and to the regional number size distribution of CCN with consequent direct and indirect effects on climate. Yet, direct information is lacking on the composition, abundance and formation pathways of the compounds that can grow nanometer size particles and on whether these compounds also contribute significantly to submicron aerosol mass . Therefore, while emissions of BVOC will likely respond to future climate change and potentially contribute to a biosphere feedback via aerosol – cloud interactions, the understanding required to faithfully represent the physical and chemical processes involved in such responses is lacking. It is the overarching hypothesis of this proposal that improved speciation of SOA composition and physical properties will improve SOA formation mechanisms and therefore model-relevant parameterizations that can better assess the anthropogenic and biogenic contributions to organic aerosol and its climate forcingThe ultimate goal of this work is to connect field and laboratory observations of organic aerosol chemical and physical properties during the growth stage to the diurnal and vertical distributions of aerosol abundance measured over the boreal forest during the Biogenic Aerosols: Effects on Clouds and Climate (BAECC) field campaign involving ARM’s AMF-2 deployment to Hyytiälä, Finland. I propose to deploy a unique instrument, capable of assessing the molecular-level elemental composition of highly oxygenated polar organic compounds in both gas and particle phases, as part of this field campaign with follow-up process studies in an environmental chamber. This project will produce three outcomes: 1) molecular composition of carboxylic acids during new particle formation and growth events and of the average background submicron aerosol in the boreal forest and its relationships to CCN and hygroscopic properties measured by AMF-2 instrumentation, 2) in situ volatility of organic aerosol components (in ambient air and pure humidified N2) to constrain equilibration timescales and thus the fate of newly formed particle mass upon dilution, mixing and transport from source regions to cloud level, and 3) replication, to the extent possible, of the above gas and aerosol characteristics observed in the field using controlled environmental chamber experiments to develop simplified chemical and physical parameterizations of organic aerosol formation from biogenic oxidation for use in large scale chemical-climate models. These outcomes will then allow for “bottom-up” simulations of the role of biogenic emissions and oxidation in setting the vertical distribution of CCN and cloud optical properties. |
| 学科分类 | 11 - 工程与技术;1107 - 航空航天工程;03 - 天文学 |
| 资助机构 | US-NASA |
| 国家 | US |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/74621 |
| 推荐引用方式 GB/T 7714 | PATRICK NEALE.TIDAL WETLANDS AS SOURCES AND SINKS OF CARBON IN A CHANGING WORLD: REMOTE SENSING, MEASUREMENTS AND MODELING OF WETLAND-OCEAN-ATMOSPHERE INTERACTIONS.2014. |
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