Airborne Profiling of Aerosol Hygroscopic and Optical Properties in the Planetary Boundary Layer PDF Download

Author: Bernadette Rosati
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 348

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Author: J. W. Fitzgerald
Publisher:
ISBN:
Category :
Languages : en
Pages : 25

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A simple model to predict the aerosol optical properties in the marine boundary layer at visible wavelengths is described. The model assumes that the boundary layer is well mixed and predicts the vertical profile of aerosol extinction and the aerosol optical thickness given the relative humidity, temperature and aerosol extinction coefficient at the surface (shipboard level) and the height of the boundary layer. The model is presented in the form of both analytical approximation formulas and nomograms. Keywords: Marine atmospheres, Atmosphere models, Aerosol extinction profiles, Aerosol optical thickness, Marine aerosols, Aerosol extinction coefficient, Marine boundary layer.

Author: Lothar H. Ruhnke
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 400

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Author: Eric P. Shettle
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 100

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Aerosol models have been developed for the lower atmosphere. These models are representative of conditions found in rural, urban, and maritime air masses. The changes in the aerosol properties with variations in the relative humidity are discussed. To describe the aerosol optical properties in the extreme of 100 percent relative humidity, several fog models are presented. For each model the coefficients for extinction, scattering, and absorption, the angular scattering distribution, and other optical parameters have been computed for wavelengths between 0.2 and 40 microns. These aerosol models are presented together with a review of their experimental basis. The optical properties of these models are discussed and some comparisons of the model with experimental measurements are presented.

Author: Mansour Zakikhani
Publisher:
ISBN:
Category : Troposphere
Languages : en
Pages : 208

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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We report in this paper the relevant results obtained for the calculation and the retrieving of the optical properties of the particles that can constitute the atmospheric aerosols. In the first section we present the preliminary results of computations of the optical properties (extinction and backscattering) for low density dispersions of particles with an irregular shape. These particles are modelled as clusters of spheres and the calculated Lidar ratios will be compared with the other computations performed using spheres with Mie theory. The values of the lidar ratio will also constitute the data base for the interpretation of the experimental data obtained with LIDAR systems. In the second section we implemented a neural network that proved to be a useful tool for the recognition of the microphysical properties of a low density dispersion of spherical particles from the angular pattern. In future we plan to extend the algorithm to the recognition of the optical parameters for nonspherical particles. In the third section we have explored the scattering properties of the irregular shaped aerosols by means an angular analysis in the IR-VIS range aimed to compare the calculated scattering patterns with the experimental ones obtained with a two-dimensional angular optical scattering device (TAOS). More extended comments are contained in a paper that will be published in Applied Optics.

Author: Lothar H. Ruhnke
Publisher:
ISBN:
Category :
Languages : en
Pages : 388

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Contents: The Physical Chemistry of Atmospheric Particles; Equilibrium Size of Atmospheric Aerosol Particles as a Function of Relative Humidity: Calculations Based on Measured Aerosol Properties; Observation of the Effect of Humidity on Light Scattering by Aerosols; Physical and Optical Behavior of Sulfate-Nitrate Aerosols in Equilibrium with Atmospheric Water Vapor, Ammonia and Nitric Acid; Vertical Structure of Aerosols Within Boundary Layer for Low-Visibility/Low-Stratus Conditions; Navy Hygroscopic Aerosol Model; Boundary-Layer Aerosol Extinction, Vertical Structure, and Hygroscopic Particle Growth Observed by Ground-Based Scanning and Airborne Lidars; The Properties and Climate of Atmospheric Haze; The Detection of Marine Haze with the Meteorological Satellites; Measurements of Ambient Tropospheric Particle Hygroscopicity as a Function of Particle Sulfate to Ammonium Molar Ratio; Nonspherical Particle Scattering Measurements; Modeling of Growth and Evaporation Effects on the Extinction Coefficients and Backscattering Functions of Common Hygroscopic Aerosols; Tropospheric Aerosols: Humidity Dependence of Light Extinction; 3.4-micrometer Wavelength Optical Characteristics of Munition-Produced Phosphorus Smoke; Hygroscopic and Hydrate Water in Aerosols and Their Effect on Fine Particle Mass and on Atmospheric Extinction.

Author: Alexander A. Kokhanovsky
Publisher: Springer Science & Business Media
ISBN: 3540499091
Category : Science
Languages : en
Pages : 154

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This new text offers experienced students a comprehensive review of available techniques for the remote sensing of aerosols. These small particles influence both atmospheric visibility and the thermodynamics of the atmosphere. They are also of great importance in any consideration of climate change problems. Aerosols may also be responsible for the loss of harvests, human health problems and ecological disasters. Thus, this detailed study of aerosol properties on a global scale could not be more timely.

Author: Jennifer Kathleen Brooke
Publisher:
ISBN:
Category :
Languages : en
Pages : 308

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