Author: Hyunsoo ChangPublisher:
ISBN:
Category : Soot
Languages : en
Pages : 324
Book Description
Determination of the Wavelength Dependence of the Optical Properties of Soot from In-situ Measurements
Author: Hyunsoo ChangDetermination of the optical properties of soot agglomerates from spectral transmittance measurements
Author: Chih Jerry KuOptical Properties of Soot Emitted from Buoyant Turbulent Diffusion Flames
Author: Sivakumar SanthanakrishnanPublisher:
ISBN:
Category :
Languages : en
Pages : 372
Book Description
Determination of the Optical Properties of Hydrocarbon Soot Particles from Transmittance Measurements
Author: Peter Holbrook GrantPublisher:
ISBN:
Category :
Languages : en
Pages : 446
Book Description
Measurement of Visible and Near-Infrared Optical Properties of Soot Produced from Laminar Flames
Author: Airborne Measurements for Environmental Research
Author: Manfred WendischPublisher: John Wiley & Sons
ISBN: 3527653236
Category : Science
Languages : en
Pages : 659
Book Description
This first comprehensive review of airborne measurement principles covers all atmospheric components and surface parameters. It describes the common techniques to characterize aerosol particles and cloud/precipitation elements, while also explaining radiation quantities and pertinent hyperspectral and active remote sensing measurement techniques along the way. As a result, the major principles of operation are introduced and exemplified using specific instruments, treating both classic and emerging measurement techniques. The two editors head an international community of eminent scientists, all of them accepted and experienced specialists in their field, who help readers to understand specific problems related to airborne research, such as immanent uncertainties and limitations. They also provide guidance on the suitability of instruments to measure certain parameters and to select the correct type of device. While primarily intended for climate, geophysical and atmospheric researchers, its relevance to solar system objects makes this work equally appealing to astronomers studying atmospheres of solar system bodies with telescopes and space probes.
Models for the Aerosols of the Lower Atmosphere and the Effects of Humidity Variations on Their Optical Properties
Author: Eric P. ShettlePublisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 100
Book Description
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.
Determination of the Optical Properties of Soot Particles from the Effective Optical Properties of Compressed Soot Pellets
Author: Harjit Singh HuraVariation in Morphology, Hygroscopicity, and Optical Properties of Soot Particles Coated by Dicarboxylic Acids
Author: Huaxin XuePublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Soot aerosols are well known to be atmospheric constituents, but the hydrophobic nature of fresh soot likely prohibits them from encouraging cloud development. Soot aged through contact with oxygenated organic compounds may become hydrophilic enough to promote water uptake. In this study, the tandem differential mobility analyzer (TDMA) and differential mobility analyzer-aerosol particle mass analyzer (DMA-APM) were employed to measure the changes in morphology and hygroscopicity of soot aerosol particles upon coating with succinic and glutaric acids. The effective densities, fractal dimensions and dynamic shape factors of fresh and coated soot aerosol particles have been determined. Significant size-dependent increases of soot particle mobility diameter, mass, and effective density ([rho]eff) were observed upon coating of aggregates with succinic acid. These properties were restored back to their initial states once the acid was removed by heating, suggesting no restructuring of the soot core had occurred. Coating of soot with glutaric acid, on the other hand, leads to a strong size shrinking with a diameter growth factor ~0.60, even after the acid has been removed by heating suggesting the strong restructuring of the soot agglomerate. The additional 90% RH cycle can evidently enhance the restructuring process. The extinction and scattering properties at 532 nm of soot particles internally mixed with dicarboxylic acids were investigated experimentally using a cavity ring-down spectrometer and an integrating nephelometer, respectively, and the absorption is derived as the difference between extinction and scattering. It was found that the organic coatings significantly affect the optical and microphysical properties of the soot aggregates. The size-dependent amplification factors of light scattering were as much as 3.8 and 1.7 with glutaric and succinic acids coatings, respectively. Additional measurements with soot particles that are first coated with glutaric acid and then heated to remove the coating show that both scattering and absorption are enhanced by irreversible restructuring of soot aggregates to more compact globules. These results reveal the microphysical state of soot aerosol with incomplete restructuring in the atmosphere, and advance the treatment of atmospheric aged soot aerosol in the Mie theory shell-and-core model.
Handbook of Atmospheric Science
Author: C. Nick HewittPublisher: John Wiley & Sons
ISBN: 0470999306
Category : Technology & Engineering
Languages : en
Pages : 648
Book Description
The alarming consequences of global climate change have highlighted the need to take urgent steps to combat the causes of air pollution. Hence, understanding the Earth's atmosphere is a vital component in Man's emerging quest for developing sustainable modes of behaviour in the 21st century. Written by a team of expert scientists, the Handbook of Atmospheric Science provides a broad and up-to-date account of our understanding of the natural processes that occur within the atmosphere. It examines how Man’s activities have had a detrimental effect on the climate, and how measures may be implemented in order to modify these activities. The book progresses through chapters covering the principles of atmospheric science and the current problems of air pollution at the urban, regional and global scales, to the tools and applications used to understand air pollution. The Handbook of Atmospheric Science offers an excellent overview of this multi-disciplinary subject and will prove invaluable to both students and researchers of atmospheric science, air pollution and global change.