A Theoretical Investigation of the Growth Rates of Ice Crystals in Clouds PDF Download
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Author: Wusheng Ji
Publisher:
ISBN:
Category :
Languages : en
Pages : 452
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Book Description
Author: Wusheng Ji
Publisher:
ISBN:
Category :
Languages : en
Pages : 452
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Book Description
Author: Rosemary M. Dyer
Publisher:
ISBN:
Category : Atmospheric physics
Languages : en
Pages : 44
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Book Description
Published results of observations of crystal habits, particle sizes and numbers of ice particles in clouds are summarized and discussed. There are systematic variations with cloud type, and in some instances, with cloud age and location within a cloud system. However, the body of data available is insufficient to formulate a climatology of ice cloud microphysics. The several measurement techniques in current use are evaluated, as are some of the techniques now under consideration for future use. The particle enhancement observed on some occasions is discussed, and the various theories accounting for it presented. Finally, recommendations are made concerning future field programs and theoretical studies required before accurate predictions of the ice cloud microphysical environment can be made. (Author).
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 376
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Samuel C. Colbeck
Publisher:
ISBN:
Category : Frazil ice
Languages : en
Pages : 20
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Author: Samuel C. Colbeck
Publisher:
ISBN:
Category : Frazil ice
Languages : en
Pages : 24
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Book Description
Author: Constantin Andronache
Publisher: Elsevier
ISBN: 012810550X
Category : Science
Languages : en
Pages : 302
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Book Description
Mixed-Phase Clouds: Observations and Modeling presents advanced research topics on mixed-phase clouds. As the societal impacts of extreme weather and its forecasting grow, there is a continuous need to refine atmospheric observations, techniques and numerical models. Understanding the role of clouds in the atmosphere is increasingly vital for current applications, such as prediction and prevention of aircraft icing, weather modification, and the assessment of the effects of cloud phase partition in climate models. This book provides the essential information needed to address these problems with a focus on current observations, simulations and applications. Provides in-depth knowledge and simulation of mixed-phase clouds over many regions of Earth, explaining their role in weather and climate Features current research examples and case studies, including those on advanced research methods from authors with experience in both academia and the industry Discusses the latest advances in this subject area, providing the reader with access to best practices for remote sensing and numerical modeling
Author: Rosemary M. Dyer
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 24
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Book Description
A one-dimensional mathematical model of the growth of ice crystals in supercooled clouds was examined in detail and a sensitivity analysis was performed. Critical parameters include seeding rate, temperature, cloud depth, liquid water content, drop size, and updraft velocities. Calculations were compared with experimental observations made during a stratus seeding field program conducted in Northern Michigan in 1977. Substituting reasonable values of cloud physics parameters and using known values of the seeding rates, minimum temperatures, and cloud depth, reasonable agreement between theoretical and observed rates of cloud dissipation was obtained. (Author).
Author: Elle Richard Hanson
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
From polar ice fogs to tropical cirrus, atmospheric ice is critically important to weather and climate, but our understanding of the vapor depositional growth of atmospheric ice particles still has significant lacunae. Models of ice particle depositional growth rely on many unrealistic assumptions regarding the particle surface characteristics and morphology, and often fail to reproduce experimental measurements of growth rates. All cloud models still rely on the crystal capacitance analogy, which is only applies to particles with rough surfaces or sublimating particles. I performed a series of experiments to measure the growth rates of ice crystals.I describe a series of different ice crystal models from purely diffusive capacitance to surface kinetics-based habit evolution methods, focusing on their assumptions, successes, and limitations. I use a simple method to test the ability of models to reproduce growth rates from 45 experiments performed by myself and other researchers. In addition, I modify an existing ice growth model to simulate the formation of facets on a spherical or rough ice particle, and I show that this model is able to correctly simulate an experiment that other models cannot.
Author:
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Category :
Languages : en
Pages :
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Abstract : Ice particles in atmospheric clouds play an important role in determining cloud lifetime, precipitation and radiation. It is therefore important to understand the whole life cycle of ice particles in the atmosphere, e.g., where they come from (nucleation), how they evolve (growth), and where they go (precipitation). Ice nucleation is the crucial step for ice formation, and in this study, we will mainly focus on ice nucleation in the lab and its effect on mixed-phase stratiform clouds. In the first half of this study, we investigate the relevance of moving contact lines (i.e., the region where three or more phases meet) on the phenomenon of contact nucleation. High speed video is used to investigate heterogeneous ice nucleation in supercooled droplets resting on cold substrates under two different dynamic conditions: droplet electrowetting and droplet vibration. Results show that contact-line motion is not a sufficient condition to trigger ice nucleation, while locally curved contact lines that can result from contact-line motion are strongly related to ice nucleation. We propose that pressure perturbations due to locally curved contact lines can strongly enhance the ice nucleation rate, which gives another interpretation for the mechanism for contact nucleation. Corresponding theoretical results provide a quantitative connection between pressure perturbations and temperature, providing a useful tool for ice nucleation calculations in atmospheric models. In this second half of the study, we build a minimalist model for long lifetime mixed-phase stratiform clouds based on stochastic ice nucleation. Our result shows that there is a non-linear relationship between ice water contact and ice number concentration in the mixed-phase cloud, as long as the volume ice nucleation rate is constant. This statistical property may help identify the source of ice nuclei in mixed-phase clouds. In addition, results from Lagrangian ice particle tracking in time dependent fields show that long lifetime ice particles exist in mixed-phase stratiform clouds. We find that small ice particle can be trapped in eddy-like structures. Whether ice particles grow or sublimate depends on the thermodynamic field in the trapping region. This dynamic-thermodynamic coupling effect on the lifetime of ice particles might explain the fast phase-partition change observed in the mixed phase cloud.
Author: Kuo-Nan Liou
Publisher: Cambridge University Press
ISBN: 0521889162
Category : Science
Languages : en
Pages : 461
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Book Description
This volume outlines the fundamentals and applications of light scattering, absorption and polarization processes involving ice crystals.
