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| Microphysical and thermodynamic retrievals in deep convective clouds using polarimetric radar measurements and spectral cloud models with explicit treatment of aerosol impact on convective processes | |
| 项目编号 | DE-SC0014295 |
| Ryzhkov, Alexander | |
| 项目主持机构 | Board of Regents of the University of Oklahoma |
| 开始日期 | 2015-07-15 |
| 结束日期 | 2019-07-14 |
| 英文摘要 | The project will use data products that were obtained during therecent Storm Peak Lab Cloud Property Validation Experiment (StormVEx, PI: Mace,Co-I: Hallar) field campaign. StormVExprovides a wealth of data to investigate indirect aerosol effects on clouddroplet formation, ice crystal formation, snow growth, and precipitation inmixed-phase cloud systems. There is abundant empirical evidence that pollutionaerosols affect cloud microphysical properties. On the other hand, less is known about aerosol effects and feedbackmechanisms associated with mixed-phase clouds, where both water and ice arepresent. The lack of knowledge pertaining to the aerosol indirect effect onmixed-phase clouds is due to the complexity introduced by the ice phase and thelack of availability of high quality observational data. It is well known fromglobal observations that cloud phase (liquid water versus ice) exerts afundamental control on precipitation formation and atmospheric radiation. Phase partitioning processes are complex inany environment, and many details of how these processes manifest in anorographic region with variable aerosol concentrations is largely unknown. Themain objective of this study is to describe and explain the impact of aerosolson distributions of super-cooled liquid water and ice in mixed-phase cloudsusing the observations during StormVEx. We will accomplish this broad objectiveusing ground-based remote sensing, in-situ aerosol and cloud particlemeasurements to focus on four fundamental questions: 1) do soot particles significantlycontribute to the formation of ice crystals?; 2) do higher concentrations oflarge, super-cooled cloud droplets promote heterogeneous ice nucleation?; and 3)does an increase in CCN lead to smaller droplets, a reduction in riming, and areduction in snowfall?. Each questionwill be addressed empirically using a two-tiered approach. The first involves identifying and analyzingspecific case studies to illustrate the different potential aerosol effects oncloud properties and precipitation. Then, building upon these cases, thebroader significance and impact of the aerosol-cloud interactions will be addressedwith a longer-term statistical perspective using the full StormVEx data sets. Theresult will be an improved understanding of the impact of aerosols on cloudmicrophysics and precipitation in a mixed-phase environment, whichwill complement planned studies using new instrumentation at the DOE ARM NorthSlope of Alaska site. |
| 学科分类 | 09 - 环境科学;06 - 生物科学 |
| 资助机构 | US-DOE |
| 项目经费 | 432857 |
| 项目类型 | Grant |
| 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/74144 |
| 推荐引用方式 GB/T 7714 | Ryzhkov, Alexander.Microphysical and thermodynamic retrievals in deep convective clouds using polarimetric radar measurements and spectral cloud models with explicit treatment of aerosol impact on convective processes.2015. |
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