Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Regional Ambient Aerosol Study full books in PDF, epub, and Kindle. Read online Regional Ambient Aerosol Study ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author :
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (318 download)
Download or read book Regional Ambient Aerosol Study written by and published by . This book was released on 1999 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bartlomiej Wojas
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.:/5 (69 download)
Download or read book Characterization and Comparison of Ambient Aerosol Air of Oxford, Ohio in Determination of NAAQS Compliance with Respect to PM2.5 written by Bartlomiej Wojas and published by . This book was released on 2006 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practicum reports on the findings from an 11 month study of sampling and characterizing the particulate matter levels in Oxford, Ohio to determine whether it is in compliance with PM2.5 NAAQS set by the US EPA. The addition of a sampling site in Oxford, Ohio to the regional monitoring network will provide PM2.5 data from the northwest corner of the Greater Cincinnati monitoring region. The particulate matter was characterized in this study for mass concentration, metal concentrations, organic concentrations, and morphology. Trends in PM2.5 concentrations were found with ambient air temperature and wind speed. Humidity, precipitation, and wind direction had little effect on PM2.5 concentrations. This report also discusses the design, construction and preliminary assessment of a two stage (PM2.5 and PM10) ambient air-sampling instrument. Finally, the paper recommends potential areas for further research.
Author : Hayder Abdul-Razzak
Publisher : BoD – Books on Demand
ISBN 13 : 9535107283
Total Pages : 494 pages
Book Rating : 4.5/5 (351 download)
Download or read book Atmospheric Aerosols written by Hayder Abdul-Razzak and published by BoD – Books on Demand. This book was released on 2012-09-12 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is divided into two sections. The first section presents characterization of atmospheric aerosols and their impact on regional climate from East Asia to the Pacific. Ground-based, air-born, and satellite data were collected and analyzed. Detailed information about measurement techniques and atmospheric conditions were provided as well. In the second section, authors provide detailed information about the organic and inorganic constituents of atmospheric aerosols. They discuss the chemical and physical processes, temporal and spatial distribution, emissions, formation, and transportation of aerosol particles. In addition, new measurement techniques are introduced. This book hopes to serve as a useful resource to resolve some of the issues associated with the complex nature of the interaction between atmospheric aerosols and climatology.
Author : Joseph James Ensberg
Publisher :
ISBN 13 :
Total Pages : 494 pages
Book Rating : 4.:/5 (878 download)
Download or read book Studies of Ambient Organic and Inorganic Aerosol in Southern California written by Joseph James Ensberg and published by . This book was released on 2014 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: The negative impacts of ambient aerosol particles, or particulate matter (PM), on human health and climate are well recognized. However, owing to the complexity of aerosol particle formation and chemical evolution, emissions control strategies remain difficult to develop in a cost effective manner. In this work, three studies are presented to address several key issues currently stymieing California's efforts to continue improving its air quality. Gas-phase organic mass (GPOM) and CO emission factors are used in conjunction with measured enhancements in oxygenated organic aerosol (OOA) relative to CO to quantify the significant lack of closure between expected and observed organic aerosol concentrations attributable to fossil-fuel emissions. Two possible conclusions emerge from the analysis to yield consistency with the ambient organic data: (1) vehicular emissions are not a dominant source of anthropogenic fossil SOA in the Los Angeles Basin, or (2) the ambient SOA mass yields used to determine the SOA formation potential of vehicular emissions are substantially higher than those derived from laboratory chamber studies. Additional laboratory chamber studies confirm that, owing to vapor-phase wall loss, the SOA mass yields currently used in virtually all 3D chemical transport models are biased low by as much as a factor of 4. Furthermore, predictions from the Statistical Oxidation Model suggest that this bias could be as high as a factor of 8 if the influence of the chamber walls could be removed entirely. Once vapor-phase wall loss has been accounted for in a new suite of laboratory chamber experiments, the SOA parameterizations within atmospheric chemical transport models should also be updated. To address the numerical challenges of implementing the next generation of SOA models in atmospheric chemical transport models, a novel mathematical framework, termed the Moment Method, is designed and presented. Assessment of the Moment Method strengths and weaknesses provide valuable insight that can guide future development of SOA modules for atmospheric CTMs. Finally, regional inorganic aerosol formation and evolution is investigated via detailed comparison of predictions from the Community Multiscale Air Quality (CMAQ version 4.7.1) model against a suite of airborne and ground-based meteorological measurements, gas- and aerosol-phase inorganic measurements, and black carbon (BC) measurements over Southern California during the CalNex field campaign in May/June 2010. Results suggests that continuing to target sulfur emissions with the hopes of reducing ambient PM concentrations may not the most effective strategy for Southern California. Instead, targeting dairy emissions is likely to be an effective strategy for substantially reducing ammonium nitrate concentrations in the eastern part of the Los Angeles Basin.
Author : Panel on Aerosol Radiative Forcing and Climate Change
Publisher : National Academies Press
ISBN 13 : 0309588871
Total Pages : 180 pages
Book Rating : 4.3/5 (95 download)
Download or read book A Plan for a Research Program on Aerosol Radiative Forcing and Climate Change written by Panel on Aerosol Radiative Forcing and Climate Change and published by National Academies Press. This book was released on 1996-05-01 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book recommends the initiation of an "integrated" research program to study the role of aerosols in the predicted global climate change. Current understanding suggest that, even now, aerosols, primarily from anthropogenic sources, may be reducing the rate of warming caused by greenhouse gas emissions. In addition to specific research recommendations, this book forcefully argues for two kinds of research program integration: integration of the individual laboratory, field, and theoretical research activities and an integrated management structure that involves all of the concerned federal agencies.
Author : Shan Zhou
Publisher :
ISBN 13 : 9780355461176
Total Pages : pages
Book Rating : 4.4/5 (611 download)
Download or read book Characterizing Ambient Organic Aerosol Properties, Sources, and Processes Via Aerosol Mass Spectrometry written by Shan Zhou and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic aerosol (OA) is an important component of the earth’s climate system, making up a substantial fraction of the fine aerosol mass in the atmosphere. However, the atmospheric evolution of OA after emission remains poorly characterized. A better understanding of its life cycle is critical for environmental issues ranging from air quality to climate change. In this dissertation, real-time measurements of submicron aerosols were made using a High-Resolution Time-of-Flight Aerosol Mass Spectrometers (AMS) during two DOE field campaigns to obtain a detailed understanding of the chemical and physical properties, sources and atmospheric processes of OA under various emission regimes. The first field study took place at a rural forest site on Long Island, NY, as part of the Aerosol Life Cycle Intensive Operation Period at Brookhaven National Lab (ALC-IOP at BNL). OA was found to dominate the submicron aerosol mass at BNL and was overwhelmingly secondary. Urban emissions transported from the New York metropolitan area led to elevated OA mass concentration and altered OA composition and physical-chemical properties at this rural site. Results suggest that mixed anthropogenic emissions and biogenic emission led to enhance secondary OA (SOA) production. The second field study took place at a high-altitude regional background site, Mt. Bachelor Observatory (MBO; ~ 2763 m a.s.l), in the western US as part of the Biomass Burning Observation Project (BBOP). Regional and free tropospheric (FT) aerosols under clean conditions were characterized. Significant compositional and physical differences between FT and boundary layer (BL) OA were observed. Free tropospheric OA was highly oxidized with low volatility, whereas OA associated with BL air masses was less oxidized and appeared to be semivolatile. For periods influenced by transported wildfires plumes during the study period, aerosol concentration at MBO increased substantially and was overwhelmingly organic. Three types of BB organic aerosol (BBOA) were identified and appeared to have been subjected to different degrees of atmospheric processing. A case study using consecutive BB plumes transported from the same fire source showed that photochemical aging led to more oxidized OA with higher mass fractions of aged BBOA and a lower fraction of fresh BBOA. Although BBOA in daytime plumes were chemically more processed than nighttime plumes, the enhancement ratios of OA relative to CO were very similar. Based on observations both at MBO and near fire sources using the DOE G-1 aircraft, BBOA concentrations and chemical properties were strongly influenced by combustion processes at the source. However, OA emissions were consistent between fresher emissions and emissions sampled after atmospheric transport. In addition, tighter correlations were observed between OA oxidation degree and plume age. These results suggest that aging leads to substantial chemical transformed and more oxidized BBOA in this study, yet BBOA concentration was conserved to a significant extent during regional transport, for which a possible reason is that SOA formation was almost entirely balanced by BBOA volatilization.
Author :
Publisher : DIANE Publishing
ISBN 13 : 1428904689
Total Pages : 514 pages
Book Rating : 4.4/5 (289 download)
Download or read book Review of the national ambient air quality standards for particulate matter policy sssessment of scientific and technical information. written by and published by DIANE Publishing. This book was released on 1982 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xueying Qin
Publisher :
ISBN 13 :
Total Pages : 353 pages
Book Rating : 4.:/5 (64 download)
Download or read book Characterization of Ambient Aerosol Composition and Formation Mechanisms and Development of Quantification Methodologies Utilizing ATOFMS written by Xueying Qin and published by . This book was released on 2007 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerosols are solid or liquid particles suspended in the air. They are generated from a range of natural and anthropogenic sources. Aerosols also experience various reactions such as photo-oxidation and aqueous-phase processing, which constantly change their physical and chemical properties. Therefore, in order to determine the emission inventory, it is important to study aerosol reactions and transformation mechanisms in ambient atmosphere. The research described in this dissertation aimed to characterize temporal, spatial, and seasonal variations on ambient aerosol chemical compositions and formation mechanisms. The results contribute to the understanding of air pollution, climate change, and human health problems, and to devising necessary strategies and policies to resolve these problems.
Author : R.C. Whitten
Publisher : Springer Science & Business Media
ISBN 13 : 3642817572
Total Pages : 163 pages
Book Rating : 4.6/5 (428 download)
Download or read book The Stratospheric Aerosol Layer written by R.C. Whitten and published by Springer Science & Business Media. This book was released on 2013-03-07 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is now a quarter of a century since Junge and his coworkers recovered the first sample from the sulfate aerosol layer in the stratosphere. Since that time vast strides have been made in determining its physical properties and morphology. These investigations have been performed with instruments on board aircraft and balloon platforms as in the early days, with ground-based lidar (optical radar), and most recently with satellite-borne optical instruments. It will become evident in Chapter 2 that in situ measurements by aircI'aft and ,balloon sensors complement rather than duplicate the remote techniques (lidar and satellite). Hence future programs will probably continue to utilize direct as well as indirect experimental techniques. Concurrently, with the observations of the gross properties of the aerosol layer, la~oratory and theoretical studies have sought to elucidate the chemical and micro physical processes which influence the formation and growth of the aerosol par ticles. The laboratory investigations have included studies of gas phase chemistry, and particle nucleation and growth mechanisms. Theoretical studies have revolved mainly around a series of models developed by atmospheric scientists. The earliest of these models was constructed by Junge and his colleagues. With the advent of third- and fourth-generation computers, the capacity to solve the quite complex continuity equations whi~h govern particle formation, growth, and removal has ad vanced to the point where most of the particle properties can be simulated with reasonable confidence.
Author :
Publisher : DIANE Publishing
ISBN 13 : 1428904697
Total Pages : 525 pages
Book Rating : 4.4/5 (289 download)
Download or read book Review of the national ambient air quality standards for particulate matter policy assessment of scientific and technical information. written by and published by DIANE Publishing. This book was released on 1996 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Manousos-Ioannis Manousakas
Publisher : MDPI
ISBN 13 : 303650995X
Total Pages : 246 pages
Book Rating : 4.0/5 (365 download)
Download or read book Sources and Composition of Ambient Particulate Matter written by Manousos-Ioannis Manousakas and published by MDPI. This book was released on 2021-09-10 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research related to ambient particulate matter (PM) remains very relevant today due to the adverse effects that PM have on human health. PM are pollutants with varying chemical compositions and may originate from multiple emission sources, which directly affects their toxicity. To formulate effective control and mitigation strategies, it is necessary to identify PM sources and to estimate their influence on ambient PM concentration, a process that is known as source apportionment (SA). Depending on the geographical location and characteristics of an area, many anthropogenic and natural sources may contribute to PM concentration levels, such as dust resuspension, sea salt, traffic, secondary aerosol formation, industrial emissions, ship emissions, biomass burning, power plant emissions, etc. Different methodological approaches have been used over the years to study the aforementioned topics, but some scientific challenges remain, mainly related to the following subjects: real-time chemical analysis and SA, uncertainty estimation of SA results, and analytical optimization for PM samples. Additionally, there are areas in the world for which the results regarding composition and sources of PM are still scarce. The objective of this collection was to include studies on all aspects of PM chemical characterization and source apportionment regarding the inorganic and/or organic fractions of PM.
Author : Yuan Wang
Publisher : Springer
ISBN 13 : 3662471752
Total Pages : 100 pages
Book Rating : 4.6/5 (624 download)
Download or read book Aerosol-Cloud Interactions from Urban, Regional, to Global Scales written by Yuan Wang and published by Springer. This book was released on 2015-05-05 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The studies in this dissertation aim at advancing our scientific understandings about physical processes involved in the aerosol-cloud-precipitation interaction and quantitatively assessing the impacts of aerosols on the cloud systems with diverse scales over the globe on the basis of the observational data analysis and various modeling studies. As recognized in the Fifth Assessment Report by the Inter-government Panel on Climate Change, the magnitude of radiative forcing by atmospheric aerosols is highly uncertain, representing the largest uncertainty in projections of future climate by anthropogenic activities. By using a newly implemented cloud microphysical scheme in the cloud-resolving model, the thesis assesses aerosol-cloud interaction for distinct weather systems, ranging from individual cumulus to mesoscale convective systems. This thesis also introduces a novel hierarchical modeling approach that solves a long outstanding mismatch between simulations by regional weather models and global climate models in the climate modeling community. More importantly, the thesis provides key scientific solutions to several challenging questions in climate science, including the global impacts of the Asian pollution. As scientists wrestle with the complexities of climate change in response to varied anthropogenic forcing, perhaps no problem is more challenging than the understanding of the impacts of atmospheric aerosols from air pollution on clouds and the global circulation.
Author : Yue Zhang
Publisher : American Chemical Society
ISBN 13 : 0841299293
Total Pages : 176 pages
Book Rating : 4.8/5 (412 download)
Download or read book Aerosols in Atmospheric Chemistry written by Yue Zhang and published by American Chemical Society. This book was released on 2022-04-01 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The uncertainties in the aerosol effects on radiative forcing limit our knowledge of climate change, presenting us with an important research challenge. Aerosols in Atmospheric Chemistry introduces basic concepts about the characterization, formation, and impacts of ambient aerosol particles as an introduction to graduate students new to the field. Each chapter also provides an up-to-date synopsis of the latest knowledge of aerosol particles in atmospheric chemistry.
Download or read book Investigation of Aerosol Optical Properties on Regional Climate Forcing and Spatial and Temporal Distributions of Aerosol and Ozone Associated with the Antarctic Polar Vortex Processes written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerosols influence Earth's heat budget both directly by scattering and absorbing sunlight, and indirectly by acting as nuclei for cloud droplets. To reduce the uncertainties of current estimates of aerosol climate forcing, aerosol optical properties relevant to the computation of direct radiative forcing were measured at a regionally representative site near Mount Mitchell, North Carolina. On the basis of these measurements and model calculations, we have studied (1) the effects of relative humidity (RH) on aerosol optical properties and direct aerosol radiative forcing and (2) the influence of long-range transport on black carbon (BC) concentrations, its seasonal and weekly patterns, and the effects of BC on the regional climate of the southeastern US. The light scattering of aerosol is strongly dependent on RH at which it is measured, due to hygroscopic growth nature of most atmospheric aerosols. In this study, the hygroscopic growth factor (ratio of total scattering coefficient at RH=80% to that at RH=30%) was calculated to be almost constant value of 1.60 +/- 0.01 for polluted, marine, and continental air masses. In addition, it was found that as the RH increased from 30% to 80%, the backscatter fraction decreased by 23%. The patterns of direct radiative climate forcing by aerosols for various values of RH were similar for the three air masses, but the magnitudes of the forcing were larger for polluted air masses than for marine and continental air masses by a factor of nearly 2 due to higher sulfate concentration in polluted air masses. The averaged forcing for all the observed ambient RHs was -2.9 W m^( -2) (the negative forcing of -3.2 by aerosol scattering plus the positive forcing of +0.3 by aerosol absorption) for polluted air masses, -1.4 W m^( -2) ( -1.5 plus +0.1) for marine air masses, and -1.5 W m^( -2) ( -1.6 plus +0.1) for continental air masses. The BC mass concentration of the southeastern US showed the highest average concentration in polluted air mas.
Author : Paul A. Solomon
Publisher : CRC Press
ISBN 13 : 9781566700597
Total Pages : 860 pages
Book Rating : 4.7/5 (5 download)
Download or read book Planning and Managing Regional Air Quality written by Paul A. Solomon and published by CRC Press. This book was released on 1994-06-15 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the widely applicable information obtained during the planning and management of the collaborative regional air quality study known as the San Joaquin Valley Air Quality Study/Atmospheric Utility Signatures, Predictions, and Experiments (SJVAQS/AUSPEX). The extensive experience and knowledge gained during and after the study is clearly presented in this guide - an ideal working reference for developing regional and subregional air quality and meteorological field measurement and modeling studies.
Author : Lih-Ching Chu
Publisher :
ISBN 13 :
Total Pages : 324 pages
Book Rating : 4.:/5 (791 download)
Download or read book The Study of Carbonaceous Ambient Aerosol written by Lih-Ching Chu and published by . This book was released on 1981 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Steven G. Brown
Publisher :
ISBN 13 :
Total Pages : 336 pages
Book Rating : 4.:/5 (496 download)
Download or read book Characterization of Carbonaceous Aerosol During the Big Bend Regional Aerosol and Visibility Observational Study written by Steven G. Brown and published by . This book was released on 2001 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
