| DOI: | 10.1002/jgrd.503652013
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| 论文题名: | The role of time in heterogeneous freezing nucleation |
| 作者: | Wright T.P.; Petters M.D.
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| 刊名: | Journal of Geophysical Research Atmospheres
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| ISSN: | 21698996
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| 出版年: | 2013
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| 卷: | 118, 期:9 | | 起始页码: | 3731
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| 结束页码: | 3743
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| 语种: | 英语
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| Scopus关键词: | Discrete event simulation
; Drops
; Dust
; Experiments
; Freezing
; Ice
; Random processes
; Arizona test dust
; Experimental procedure
; Freezing process
; Freezing temperatures
; Heterogeneous freezing
; Laboratory experiments
; Size fluctuations
; Theoretical models
; Nucleation
; aerosol
; bioassay
; catalysis
; cloud water
; dust
; experimental study
; freezing
; heterogeneity
; nucleation
; numerical model
; temperature effect
; Arizona
; United States
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| 英文摘要: | A small fraction of particles in the atmosphere can catalyze ice formation in cloud water drops through heterogeneous freezing nucleation at temperatures warmer than the homogeneous freezing temperature of approximately 38C. The rate for heterogeneous freezing nucleation is dependent on several factors, including the type and surface area of dust that is immersed inside the drop. Although nucleation is an inherently stochastic process resulting from size fluctuations of the incipient ice germ, there is a growing body of literature that suggests that quasi-deterministic models of ice nucleation can describe laboratory experiments. Here we present new experiments and simulations that aim to better constrain theoretical models fitted to laboratory data. We collected ice nucleation data for Arizona Test Dust aerosol immersed in water using a droplet freezing assay setup that allows for the cooling rates to be changed between 10 and 0.01 K min1. Discrete event simulations based on a variant of the multiple-component stochastic model of heterogeneous freezing nucleation were used to simulate different experimental procedures. The nucleation properties of the dust are specified by four material-dependent parameters that accurately describe the time dependence of the freezing process. We anticipate that the combination of discrete event simulations and a spectrum of experimental procedures described here can be used to design more meaningful laboratory experiments probing ice nucleation and will aid the development of better parameterizations for use in models. © 2013. American Geophysical Union. All Rights Reserved. |
| 资助项目: | NSF-AGS 1010851
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/63471
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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作者单位: | Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Campus Box 8208, Raleigh, NC 27695-8208, United States
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| Recommended Citation: | |
Wright T.P.,Petters M.D.. The role of time in heterogeneous freezing nucleation[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(9)
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