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| 项目编号 | 0116896 |
| MRI: Development of a Cylindrical Cloud Condensation Nuclei (CCN) Spectrometer | |
| James Hudson | |
| 主持机构 | Nevada System of Higher Education, Desert Research Institute |
| 开始日期 | 2001-08-15 |
| 结束日期 | 2005-12-31 |
| 资助经费 | 414000(USD) |
| 项目类别 | Continuing Grant |
| 资助机构 | US-NSF（美国国家科学基金会） |
| 项目所属计划 | MAJOR RESEARCH INSTRUMENTATION, PHYSICAL & DYNAMIC METEOROLOGY, EPSCoR Co-Funding |
| 语种 | 英语 |
| 国家 | 美国 |
| 英文简介 | This is a Major Research Instrumentation award to enable the design and construction of a new instrument for measuring the activity spectrum of cloud condensation nuclei (CCN). The principle of operation is that air is drawn slowly and continuously through a thermal-gradient diffusion chamber in which the supersaturation increases with increasing distance into the chamber. At the exit of the chamber, the cloud droplets that have formed are counted and sized with an optical particle counter. A mathematical inversion procedure is then used to compute the CCN spectrum from the measured droplet spectrum, assuming a relationship between the size of a droplet and the critical supersaturation at which it formed. The proposed instrument is an improvement over existing designs for two reasons: modern digital electronics will be used for particle detection and counting, and by use of concentric cylindrical walls the cloud chamber will be in the shape of an annulus instead of a simple rectangular channel. The advantage of the annular shape is that undesirable edge effects associated with side walls are eliminated. The information provided by the instrument is fundamental for cloud microphysics and also bears on the way aerosol particles and their radiative effects are treated in numerical climate models. |
| 来源学科分类 | Geosciences |
| URL | https://www.nsf.gov/awardsearch/showAward?AWD_ID=0116896 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/342250 |
| 推荐引用方式 GB/T 7714 | James Hudson.MRI: Development of a Cylindrical Cloud Condensation Nuclei (CCN) Spectrometer.2001. |
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