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DOI | 10.1175/JAS-D-15-0370.1 |
Condensational Growth of Drops Formed on Giant Sea-Salt Aerosol Particles | |
Jensen, Jorgen B.; Nugent, Alison D. | |
2017-03-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The most basic aspect of cloud formation is condensational growth onto cloud condensation nuclei (CCN). As such, condensational growth of cloud drops is often assumed to be a well-understood process described by the drop growth equation. When this process is represented in models, CCN activate into cloud drops at cloud base, and it is often assumed that drops consist of pure water or that the hygroscopic contribution after drop activation is small because of the inclusion of only small CCN. Drop growth rate in adiabatic ascent in such models is proportional to supersaturation and assumed to be inversely proportional to the drop radius, thereby making the drop spectrum narrow with altitude. However, the present study demonstrates that drop growth on giant sea-salt aerosol particles (GCCN; dry radius r(d) > 0.5 mu m) behaves differently. For typical marine stratocumulus updrafts and for drops grown on GCCN with sizes r(d) greater than or similar to 2 mu m, these drops typically remain concentrated salt solutions. Because of this, their condensational growth is accelerated, and they rapidly attain precipitation drop sizes through condensation only. Additionally, drops formed on GCCN may also grow by condensation in cloudy downdrafts. The strong effect of condensation on GCCN is important when carried through to calculating rain-rate contribution as a function of aerosol size. GCCN larger than 2 mm account for most of the rainfall rate in the modeled precipitating marine stratocumulus. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394344800003 |
WOS关键词 | EDDY SIMULATION-MODEL ; PART II ; EXPLICIT MICROPHYSICS ; SIZE DISTRIBUTIONS ; CLOUD MICROPHYSICS ; DRIZZLE FORMATION ; SPECTRAL AEROSOL ; CLIMATE MODELS ; CUMULUS ; STRATOCUMULUS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29709 |
专题 | 地球科学 |
作者单位 | Natl Ctr Atmospher Res, Earth Observing Lab, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Jensen, Jorgen B.,Nugent, Alison D.. Condensational Growth of Drops Formed on Giant Sea-Salt Aerosol Particles[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(3). |
APA | Jensen, Jorgen B.,&Nugent, Alison D..(2017).Condensational Growth of Drops Formed on Giant Sea-Salt Aerosol Particles.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(3). |
MLA | Jensen, Jorgen B.,et al."Condensational Growth of Drops Formed on Giant Sea-Salt Aerosol Particles".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.3(2017). |
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