Climate Change Data Portal
| PHYTOPLANKTON COMMUNITY STRUCTURE, CARBON STOCK, CARBON EXPORT AND CARBON FLUX: WHAT ROLE DO DIATOMS PLAY IN THE NORTH PACIFIC AND NORTH ATLANTIC OCEANS? | |
| 项目编号 | 80NSSC17K0700 P00003 |
| COLLIN ROESLER | |
| 开始日期 | 2017-09-19 |
| 结束日期 | 2020-09-18 |
| 英文摘要 | Secondary organic aerosols (SOA) account for a major fraction of particulate matter in the atmosphere, affecting climate, air quality, and public health. SOA formation and evolution are highly complex processes involving both chemical reactions and transport of molecules in air, at particle surfaces, and within particles. The state of the matter, or “phase state,” comprising SOA can vary from a liquid, over an amorphous semi-solid, to a glassy solid, depending on chemical composition, water content, relative humidity (RH), and temperature. The occurrence of glassy and amorphous semi-solid states can pose limitations on the rate of transport of molecules, affecting gas-particle interactions and challenging the treatment of SOA in atmospheric models. There is still a lack of understanding of the impacts of phase state and water content on SOA processes. The first objective of this project is to improve fundamental understanding of the interplay of the phase state of particles and water content on the evolution of SOA mass and particle size distribution. We will analyze the existing literature on RH effects on SOA formation and perform additional targeted laboratory experiments using state-of-the-art instrumentation. Data from lab experiments performed at different RH will be analyzed using a novel framework developed by the PI, called the “molecular corridor approach,” in order to estimate two key parameters related to particle phase state: volatility and glass transition temperature. In addition the evolution of particle size and composition will be modeled using the kinetic multi-layer model of gas-particle interaction in aerosols and clouds (KM-GAP). We will also analyze field data of SOA chemical composition and concentrations of key gases from four recent DOE-funded campaigns (HI-SCALE, GoAmazon2014/15, NPFS, BAECC). Using the molecular corridor approach and KM-GAP, our analysis will focus on quantifying the limitations on the rates of reactive and non-reactive (reversible) uptake of organics, ammonia and amines into particles. The second objective of this proposal is to develop a model representation and evaluate the effects of phase state and water content on formation, growth, and chemical transformation of SOA in a regional climate and air quality model (e.g., WRF-Chem) and to compare model predictions with ARM field measurements. Spatial distribution and temporal evolution of aerosol water content, glass transition temperature and SOA phase state will be modeled for campaign-long simulations. The impacts of phase state and water content on SOA lifecycle will be evaluated in a regional scale with the ultimate goal of reducing the uncertainty of SOA representation in regional climate and air quality predictions. |
| 学科分类 | 1107 - 航空航天工程;11 - 工程与技术 |
| 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/73369 |
| 推荐引用方式 GB/T 7714 | COLLIN ROESLER.PHYTOPLANKTON COMMUNITY STRUCTURE, CARBON STOCK, CARBON EXPORT AND CARBON FLUX: WHAT ROLE DO DIATOMS PLAY IN THE NORTH PACIFIC AND NORTH ATLANTIC OCEANS?.2017. |
| 条目包含的文件 | 条目无相关文件。 | |||||
| 个性服务 |
| 推荐该条目 |
| 保存到收藏夹 |
| 导出为Endnote文件 |
| 谷歌学术 |
| 谷歌学术中相似的文章 |
| [COLLIN ROESLER]的文章 |
| 百度学术 |
| 百度学术中相似的文章 |
| [COLLIN ROESLER]的文章 |
| 必应学术 |
| 必应学术中相似的文章 |
| [COLLIN ROESLER]的文章 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
