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DOI | 10.1002/2016GL072486 |
Microscale characteristics of homogeneous freezing events in cirrus clouds | |
Kaercher, B.1; Jensen, E. J.2 | |
2017-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; USA |
英文摘要 | We investigate homogeneous freezing of aqueous aerosol particles, a fundamental ice formation process in cirrus clouds. We estimate freezing time scales and vertical extensions of freezing layers, demonstrating that such freezing events are highly transient and localized. While time scales decrease with increasing vertical velocity driving ice nucleation, layer depths are weak functions of the vertical velocity. Our results are used to discuss possible effects of turbulent diffusion and entrainment-mixing on homogeneous freezing in cirrus. Large turbulent diffusivity acts to broaden water vapor-depleted freezing layers and facilitate sedimentation of freshly nucleated ice crystals out of them into ice-supersaturated air. Homogeneous freezing events could be affected by microscale turbulence in episodes of intense turbulence dissipation rates, although such episodes are rare. We conjecture that freezing layers are broader in the case of heterogeneous ice nucleation and effects of sedimentation on nucleation increase in importance. Our findings point to the difficulty of inferring nucleated cirrus ice crystal numbers from measurements and place tight constraints on cirrus models with regard to spatial and temporal resolution. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396411100049 |
WOS关键词 | TROPICAL TROPOPAUSE LAYER ; ICE NUCLEATION ; VERTICAL VELOCITY ; GRAVITY-WAVES ; TEMPERATURE ; WATER ; FLUCTUATIONS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/28699 |
专题 | 气候变化 |
作者单位 | 1.Inst Atmospher Phys, Deutsch Zentrum Luft & Raumfahrt, Wessling, Germany; 2.NASA, Ames Res Ctr, Moffett Field, CA USA |
推荐引用方式 GB/T 7714 | Kaercher, B.,Jensen, E. J.. Microscale characteristics of homogeneous freezing events in cirrus clouds[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(4). |
APA | Kaercher, B.,&Jensen, E. J..(2017).Microscale characteristics of homogeneous freezing events in cirrus clouds.GEOPHYSICAL RESEARCH LETTERS,44(4). |
MLA | Kaercher, B.,et al."Microscale characteristics of homogeneous freezing events in cirrus clouds".GEOPHYSICAL RESEARCH LETTERS 44.4(2017). |
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