Case Studies of the Structure of the Atmospheric Boundary Layer Entrainment Zone PDF Download
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Author: Timothy D. Crum
Publisher:
ISBN:
Category :
Languages : en
Pages : 542
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Book Description
The structure of the atmospheric entrainment zone, an interfacial layer between the convective boundary layer and the stable air aloft, is studied using data obtained during Boundary Layer Experiment 1983 in Oklahoma. Coincident high resolution aircraft and lidar observations provided a unique picture of the daytime continental entrainment zone. Fast-response Lyman alpha hygrometer output voltages from the aircraft are calibrated to yield meteorological units of humidity. Humidity values indicative of surface layer air are observed at all levels within rising thermals, and the corresponding top-hat humidity cross sections suggest little lateral entrainment. Two approaches are taken to describe the humidity structure of the entrainment zone. The first uses the linear mixing character of specific humidity. This yields vertical profiles of the proportion of surface layer air that are described well by the cumulative distribution function of asymmetrical double exponential functions. The second approach models frequency distributions of three types of air in the entrainment zone: unmixed free atmosphere (dry); unmixed surface layer air (moist); and a mixture of these two. These results can be useful in cloud models and for future studies of the boundary layer.
Author: Timothy D. Crum
Publisher:
ISBN:
Category :
Languages : en
Pages : 542
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Book Description
The structure of the atmospheric entrainment zone, an interfacial layer between the convective boundary layer and the stable air aloft, is studied using data obtained during Boundary Layer Experiment 1983 in Oklahoma. Coincident high resolution aircraft and lidar observations provided a unique picture of the daytime continental entrainment zone. Fast-response Lyman alpha hygrometer output voltages from the aircraft are calibrated to yield meteorological units of humidity. Humidity values indicative of surface layer air are observed at all levels within rising thermals, and the corresponding top-hat humidity cross sections suggest little lateral entrainment. Two approaches are taken to describe the humidity structure of the entrainment zone. The first uses the linear mixing character of specific humidity. This yields vertical profiles of the proportion of surface layer air that are described well by the cumulative distribution function of asymmetrical double exponential functions. The second approach models frequency distributions of three types of air in the entrainment zone: unmixed free atmosphere (dry); unmixed surface layer air (moist); and a mixture of these two. These results can be useful in cloud models and for future studies of the boundary layer.
Author: Timothy D. Crum
Publisher:
ISBN:
Category : Boundary layer (Meteorology)
Languages : en
Pages : 280
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Book Description
Author: J. C. Kaimal
Publisher: Oxford University Press
ISBN: 0195362772
Category : Science
Languages : en
Pages : 304
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Book Description
Boundary layer meteorology is the study of the physical processes that take place in the layer of air that is most influenced by the earth's underlying surface. This text/reference gives an uncomplicated view of the structure of the boundary layer, the instruments available for measuring its mean and turbulent properties, how best to make the measurements, and ways to process and analyze the data. The main applications of the book are in atmospheric modelling, wind engineering, air pollution, and agricultural meteorology. The authors have pioneered research on atmospheric turbulence and flow, and are noted for their contributions to the study of the boundary layer. This important work will interest atmospheric scientists, meteorologists, and students and faculty in these fields.
Author: Zbigniew Sorbjan
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 344
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Book Description
Author: J. R. Garratt
Publisher: Cambridge University Press
ISBN: 9780521467452
Category : Mathematics
Languages : en
Pages : 340
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Book Description
The book gives a comprehensive and lucid account of the science of the atmospheric boundary layer (ABL). There is an emphasis on the application of the ABL to numerical modelling of the climate. The book comprises nine chapters, several appendices (data tables, information sources, physical constants) and an extensive reference list. Chapter 1 serves as an introduction, with chapters 2 and 3 dealing with the development of mean and turbulence equations, and the many scaling laws and theories that are the cornerstone of any serious ABL treatment. Modelling of the ABL is crucially dependent for its realism on the surface boundary conditions, and chapters 4 and 5 deal with aerodynamic and energy considerations, with attention to both dry and wet land surfaces and sea. The structure of the clear-sky, thermally stratified ABL is treated in chapter 6, including the convective and stable cases over homogeneous land, the marine ABL and the internal boundary layer at the coastline. Chapter 7 then extends the discussion to the cloudy ABL. This is seen as particularly relevant, since the extensive stratocumulus regions over the subtropical oceans and stratus regions over the Arctic are now identified as key players in the climate system. Finally, chapters 8 and 9 bring much of the book's material together in a discussion of appropriate ABL and surface parameterization schemes in general circulation models of the atmosphere that are being used for climate simulation.
Author: Roland Stull
Publisher: Sundog Publishing, LLC
ISBN: 9780888652836
Category : Science
Languages : en
Pages : 942
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Book Description
A quantitative introduction to atmospheric science for students and professionals who want to understand and apply basic meteorological concepts but who are not ready for calculus.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 456
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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: Bernard M. Claxton
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309046874
Category : Science
Languages : en
Pages : 112
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Book Description
Almost half the U.S. population lives along the coast. In another 20 years this population is expected to more than double in size. The unique weather and climate of the coastal zone, circulating pollutants, altering storms, changing temperature, and moving coastal currents affect air pollution and disaster preparedness, ocean pollution, and safeguarding near-shore ecosystems. Activities in commerce, industry, transportation, freshwater supply, safety, recreation, and national defense also are affected. The research community engaged in studies of coastal meteorology in recent years has made significant advancements in describing and predicting atmospheric properties along coasts. Coastal Meteorology reviews this progress and recommends research that would increase the value and application of what is known today.
Author: Hadassah Kaplan
Publisher: Springer Science & Business Media
ISBN: 9400965141
Category : Science
Languages : en
Pages : 480
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Book Description
In this volume, we present the lectures given during the 1984 OHOLO Conference, held in Zichron Yaacov, Israel. The Conference was organized by the Israel Institute for Biological Research, Department of Mathematics, which is involved in Environmental Risk Evaluation, and in Projects Estimating the Potential of Wind Energy. The lectures cover a broad spectrum of mathematical models, ranging from those that deal with the solution of atmospheric conservation equations, and to those models that yield empirical estimates based on real time measure ments and thus are unique to the locale where measured. The goal of the Conference was to allow scientists from various countries to meet and discuss topics of mutual interest, including the following: 1. Structure of the boundary layer - primarily models dealing in the understanding of the various processes of atmospheric energy transfer, and their influence on the size and composition of the boundary 1 ayer. 2. Advanced mathematical techniques for describing flow and diffusion - lectures on approximations and techniques for solving the diffu sion and transport equations. 3. Flow over complex terrain - research into various aspects of the problem - mathematical models, physical models, experimental results. 4. Models of pollution transport and deposition.
