Download or read book Correlations Between Optical Chemical and Physical Properties OfBiomass Burn Aerosols written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerosols generated from burning different plant fuels were characterized to determine relationships between chemical, optical and physical properties. Single scattering albedo ([omega]) and Angstrom absorption coefficients ([alpha]{sub ap}) were measured using a photoacoustic technique combined with a reciprocal nephelometer. Carbon-to-oxygen atomic ratios, sp2 hybridization, elemental composition and morphology of individual particles were measured using scanning transmission X-ray microscopy coupled with near-edge X-ray absorption fine structure spectroscopy (STXM/NEXAFS) and scanning electron microscopy with energy dispersion of X-rays (SEM/EDX). Particles were grouped into three categories based on sp2 hybridization and chemical composition. Measured [omega] (0.4-1.0 at 405 nm) and [alpha]{sub ap} (1.0-3.5) values displayed a fuel dependence. The category with sp2 hybridization>80% had values of [omega] (0.5) and [alpha]{sub ap} (H".25) characteristic of light absorbing soot. Other categories with lower sp2 hybridization (20 to 60%) exhibited higher [omega] (0.8) and [alpha]{sub ap} (1.0 to 3.5) values, indicating increased absorption spectral selectivity.
Download or read book Optical and Physical Properties of Biomass Burning Aerosols written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of the spatial and temporal variability of size resolved PM2 5 composition and mixing state in multiple regions in California written by Kimberly Prather and published by California Air Resources Board. This book was released on 2009-12-01 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Final report for California Air Resources Board contract 04-336. For an abstract and link to full text, please see: http://www.arb.ca.gov/research/single-project.php?row_id=64974
Download or read book Optical Properties of Biomass Burning Aerosols Measured During FLAME 4 written by Rudra Prasad Pokhrel and published by . This book was released on 2015 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical properties of biomass burning aerosol at three different wavelengths (405, 532, and 660 nm) have been measured during the Fourth Fire Lab at Missoula Experiment (FLAME-4), which took place at the Fire Science Laboratory in Missoula, Montana, in October and November, 2012. During the experiment, absorption and extinction coefficients of aerosol emissions from biomass burning were measured. A photo-acoustic absorption spectrometer (PAS) measured the absorption coefficient of dry and denuded aerosol while a cavity ring-down spectrometer (CRDS) measured the extinction coefficient of dry and denuded aerosol. During the experiment, a wide range of fuels that represent significant sources of biomass emissions from different parts of world were burned. Fuels included trees, grasses, shrubs and peat. Fuels were burned in two different ways namely stack burns which allowed for measurements during different phases of the burn (flaming vs. smoldering) and room burns which allowed for detailed measurements of well mixed smoke from all phases of the fire. Single scattering albedo (SSA) and absorption angstrom exponent (AAE) values for the biomass burning aerosols have been calculated are now represented. Eight fuels were combusted during 20 individual stack burns and 12 fuels were analyzed during 21 room burns. Parameterizations of SSA and AAE as functions of modified combustion efficiency (MCE) and a proxy for the ratio of black carbon to organic carbon mass (BC:OA proxy) have been developed. The BC:OA proxy is found to shown better correlation to both SSA and AAE than does MCE. Combined of the stack and room burn results (41 individual burns and 12 different fuels) show that the BC:OA proxy can explain 94% of the variability in SSA and 70 % of the variability in AAE while MCE can only explain 40 % and 54 % of the variability in SSA and AAE, respectively.
Download or read book Determination of the Spatial and Temporal Variability of Size resolved P 25 Composition and Mixing State in Multiple Regions in California written by and published by . This book was released on 2009 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atmospheric Aerosol Properties and Climate Impacts written by Mian Chin and published by DIANE Publishing. This book was released on 2009-05 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Synthesis and Assessment Product (SAP) critically reviews current knowledge about global distributions and properties of atmospheric aerosols, as they relate to aerosol impacts on climate. It assesses possible next steps aimed at substantially reducing uncertainties in aerosol radiative forcing estimates. Current measurement techniques and modeling approaches are summarized, providing context. The objectives of this report are: (1) to promote a consensus about the knowledge base for climate change decision support; and (2) to provide a synthesis and integration of the current knowledge of the climate-relevant impacts of anthropogenic aerosols. Illustrations.
Download or read book Multiphase Environmental Chemistry in the Atmosphere written by Sherri W. Hunt and published by ACS Symposium. This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights new cross-disciplinary advances in aerosol chemistry that involve more than one phase, for example, unique chemical processes occurring on gas-solid and liquid-solid interfaces.
Download or read book The Optical Chemical and Physical Properties of Aerosols and Gases Emitted by the Laboratory Combustion of Wildland Fuels written by Gavin R. McMeeking and published by . This book was released on 2008 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Resolution Active Optical Remote Sensing Observations of Aerosols Clouds and Aerosol Cloud Interactions and Their Implication to Climate written by Simone Lolli and published by MDPI. This book was released on 2020-12-03 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Remote Sensing is of paramount importance for Earth Observation to monitor and analyze the Earth’s vital signs. In this Special Issue are reported the latest research results involving active optical remote sensing instruments, both from ground-based to satellite platforms, that are involved in analyzing the vertical and horizontal aerosol and cloud distribution, other than their geometrical, optical and microphysical properties. Those active optical remote sensing techniques are also very useful in determining pollutant dispersion and the dynamics inside the boundary layer. The published studies put in evidence the hidden mechanisms on how pollution from the source is advected transnationally in other countries and the interaction with local meteorology.
Download or read book Atmospheric Aerosol Properties and Climate Impacts written by and published by . This book was released on 2009 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Properties of Aerosol Emitted from Indoor Biomass Burning Cookstoves written by Samuel Arthur Whidden and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aerosol Physical Properties and Emission Factors from Open Biomass Burning and Cookstove Emissions written by Oluwatobi Olamiposi Oke and published by . This book was released on 2015 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Properties and Radiative Forcing of Southern African Biomass Burning Aerosol written by Brian Indrek Magi and published by . This book was released on 2006 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aerosol Optical Depth and Precipitation written by Sneha Gautam and published by Springer Nature. This book was released on with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atmospheric Aerosol Properties written by Kirill Ya. Kondratyev and published by Springer Science & Business Media. This book was released on 2006-08-29 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the first comprehensive analysis of how aerosols form in the atmosphere through in situ processes as well as via transport from the surface (dust storms, seas spray, biogenic emissions, forest fires etc.). Such an analysis has been followed by the consideration of both observation data (various field observational experiments) and numerical modeling results to assess climate impacts of aerosols bearing in mind that these impacts are the most significant uncertainty in studying natural and anthropogenic causes of climate change.
Download or read book Global Biomass Burning written by Joel S. Levine and published by MIT Press. This book was released on 1991 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive volume is the first to consider biomass burning as a global phenomenon and to assess its impact on the atmosphere, on climate, and on the biosphere itself.
Download or read book The Impact of Desert Dust Across the Mediterranean written by Stefano Guerzoni and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: The atmosphere is an important pathway for the transport of continentally-derived material to the oceans. In this respect the Mediterranean Sea is of special importance because its atmosphere receives inputs of anthropogenic aerosols from the north and desert- derived Saharan dusts from the south. The dusts, much of which is transported in the form of seasonal `pulses', have important effects on climate, marine chemistry and sedimentation in the Mediterranean Sea. This volume brings together reviews and specific-topic papers on the following aspects of Saharan dust transport to the Mediterranean Sea: (i) the modelling of Saharan dust transport, (ii) the chemistry and mineralogy of the dusts and their effect on precipitation, (iii) the contribution of the dusts to marine sedimentation, (iv) the aerobiology of the dusts, and (v) climatic implications of Saharan dust transport. The volume is aimed at students and researchers with an interest in the climate, biogeochemistry and geology of the Mediterranean Sea.
