Interactions of Aerosol Particles and Marine Stratocumulus Clouds

气溶胶颗粒与海洋层积云的相互作用

• 批准号: 0104707
• 负责人: Cynthia Twohy
• 金额: $ 20.19万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-05-15 至 2005-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0104707&HistoricalAwards=false
• 关键词: Interactions; Aerosol; Particles; Marine; Stratocumulus

The objective of this project is to characterize the chemical and physical characteristics of aerosol particles above, in, and below stratocumulus clouds. The study will be carried out as part of the DYCOMS-II project (Dynamics and Chemistry of Marine Stratocumulus), off the California coast in July 2001. The interaction of aerosol and cloud particles will be evaluated by comparing the size distributions and chemical composition of particles measured within cloud with those outside the cloud. Measurements of the cloud droplet size distribution will be used to investigate the effects of aerosol particles on cloud microphysical properties. Instrumentation includes particle spectrometers for the size range 0.005 to 6400 micrometers. Electron microscopy of aerosol samples will be used to identify chemical functional groups, including organic species, and elements. The residue of cloud droplets collected by counterflow virtual impaction will be analyzed the same way. The data will give insight on the following scientific problems: (1) the chemical composition of particles incorporated into cloud droplets; (2) the effects of different aerosol chemical types and size distributions on cloud microphysics; (3) the degree of chemical processing of the aerosols by cloud; (4) the extent to which the observations can be approximated by physical and chemical cloud models. The ultimate goal of the research is to improve the ability to parameterize the radiative, dynamic, and thermodynamic effects of clouds in large-scale models of atmospheric circulation and climate.

该项目的目的是表征上述气溶胶颗粒的化学和物理特性，在层云层中。 这项研究将作为II II项目（海洋层流的动力学和化学）的一部分，2001年7月在加利福尼亚海岸附近进行。气溶胶和云颗粒的相互作用将通过比较大小分布和化学成分来评估在云中测量的颗粒与云外的颗粒。 云液滴尺寸分布的测量将用于研究气溶胶颗粒对云微物理特性的影响。 仪器包括尺寸为0.005至6400微米的粒子光谱仪。 气溶胶样品的电子显微镜将用于鉴定包括有机物种和元素在内的化学官能团。 通过相同的方式分析了通过反流虚拟撞击收集的云液滴的残留物。 数据将洞悉以下科学问题：（1）掺入云滴中的颗粒的化学成分； （2）不同气溶胶化学类型和大小分布对云微物理学的影响； （3）云通过云的化学加工程度； （4）通过物理和化学云模型可以近似观测的程度。 该研究的最终目标是提高在大气环流和气候大规模模型中云的辐射，动态和热力学效应的参数能力。