Sentences with phrase «of organic aerosol»

Atmospheric concentrations of organic aerosol are frequently similar to those of industrial sulphate aerosol.

Knowledge on the hygroscopicity of OA and measurements of optical properties of the organic aerosol constituents are summarized.

The ensemble of the simulations was used to build an integrated and robust view of our understanding of organic aerosol sources and sinks in the troposphere.

Her research experience includes modeling of organic aerosol oxidation at LBNL, fabrication and optimization of high performance semiconductor nanoparticle - based image sensors as Manager of Materials Development at InVisage Technologies, Inc., and foundational and applied research as a Research Staff Member at IBM's Almaden Research Center on transformations in dielectrics, semiconductors, metals, and polymer films.

Volatility is a key property of organic aerosol because it determines the partitioning between the gas and particle phases, and thus the formation of SOA particles.

Along the PlaetSolar itinerary, the colored dots represent the concentration of organic aerosols, from blue (light concentration) to red (strong concentration).

However, to make climate models more accurate, we are focused on developing a better understanding of the dynamics of organic aerosols formed from plant - based organic vapors and their interaction with aerosols emitted from human activities,» said Dr. Chen Song, a PNNL atmospheric scientist.

Why It Matters: Current atmospheric computer models do not consider the evolving chemistry of the organic aerosols.

The researchers at PNNL and UCI are continuing to answer questions about the properties of organic aerosols in the atmosphere.

International research group shows that the aging of organic aerosols is caused by OH radicals

The experiments showed that the mass and composition of organic aerosols are significantly influenced by OH radicals.

The absorbing effect of organic aerosols is thus implicitly included in the BC estimate, although to an unknown extent.

Chamber research is focused on understanding the lifecycle of organic aerosols, including their formation, growth, aging (oxidation), re-volatilization, and effect on cloud formation.

Topics that I work on or plan to work in the future include studies of: + missing aerosol species and sources, such as the primary oceanic aerosols and their importance on the remote marine atmosphere, the in - cloud and aerosol water aqueous formation of organic aerosols that can lead to brown carbon formation, the primary terrestrial biological particles, and the organic nitrogen + missing aerosol parameterizations, such as the effect of aerosol mixing on cloud condensation nuclei and aerosol absorption, the semi-volatility of primary organic aerosols, the importance of in - canopy processes on natural terrestrial aerosol and aerosol precursor sources, and the mineral dust iron solubility and bioavailability + the change of aerosol burden and its spatiotemporal distribution, especially with regard to its role and importance on gas - phase chemistry via photolysis rates changes and heterogeneous reactions in the atmosphere, as well as their effect on key gas - phase species like ozone + the physical and optical properties of aerosols, which affect aerosol transport, lifetime, and light scattering and absorption, with the latter being very sensitive to the vertical distribution of absorbing aerosols + aerosol - cloud interactions, which include cloud activation, the aerosol indirect effect and the impact of clouds on aerosol removal + changes on climate and feedbacks related with all these topics In order to understand the climate system as a whole, improve the aerosol representation in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climate.

Not exact matches

She decided to study the role that organic particles play in cloud droplet formation, because a large proportion of marine aerosols — which have a significant climate impact — are organics.

The results imply that the interaction between organic and sulfuric acids promotes efficient formation of organic and sulfate aerosols in the polluted atmosphere because of emissions from burning of fossil fuels, which strongly affect human health and global climate.

Carbonaceous PM is made up of black carbon, primary organic aerosol (POA) and, especially, secondary organic aerosol (SOA), which is known to contain harmful reactive oxygen species and can damage lung tissue.

Aerosol nucleation is known to require sulphuric acid, but Kirkby's team found that it is not enough by itself at low altitudes — the presence of an additional organic trace vapour is needed (Nature, DOI: 10.1038 / nature10343).

They also play a role in the formation of secondary organic aerosols — air pollutants produced when sunlight, organic molecules and airborne chemicals come together and interact.

Xiao used battery powered aerosol monitors to measure indoor concentrations of fine particulate matter, or particles 2.5 micrometers in diameter or smaller, which consists mainly of black carbon and organic carbon.

Such model included meteorological factors like levels of aerosols, anthropogenic and biogenic volatile organic compounds (VOCs), ozone, carbon dioxide, methane, and other items that influence global temperature — the surface albedo among them.

It involves generating aerosol droplets that consist of a solid core and a shell made of organic materials that mimic some of the polymers one would find in electronics.

Forest fires in the lower latitudes, however, are actually beneficial sources of black carbon because it is coupled with organic aerosols and ends up reflecting light and heat, causing the surrounding area to cool.

This provides a new insight into the conventional belief that tree leaves are the primary source of organic gases and aerosols which can affect the cloud formation.

Yet, the factors that influence the formation of these aerosols, known as secondary organic aerosol or SOA, are often assumed.

A study published April 7 in PNAS Online Early Edition describes how a team of scientists, including researchers from the University of California, Davis, showed that vapor losses to the walls of laboratory chambers can suppress the formation of secondary organic aerosol, which in turn has contributed to the underprediction of SOA in climate and air quality models.

In one of the first studies of its kind, scientists have found that tar sands production in Canada is one of North America's largest sources of secondary organic aerosols — air pollutants that affect the climate, cloud formation and public health.

Laboratory chamber walls have been stealing vapors, causing researchers to underestimate the formation of secondary organic aerosol in the atmosphere.

The resulting mass concentration of secondary organic aerosols was roughly between five and 100 μg / m3.

It drives the formation of much of the atmospheric organic aerosol present in our environment.

The new findings help to explain a significant part of the organic mass of aerosol particles in the air, which had remained mysterious to the scientists so far.

«The results suggest that about 10 percent of the reacting VOC mass is converted tosecondary organic aerosol over the tree tops.

This includes the role of oxidized volatile organic compounds, such as limonene and alpha - pinene, the typical scents of the citrus fruits and coniferous forests, in aerosol formation.

Using aircraft to measure air pollution over the Alberta tar sands region, the researchers found that tar sands production emitted between 55 and 101 metric tonnes of secondary organic aerosols per day.

In research recently published in Environmental Science & Technology, Waring describes the role of limonene, the organic compound that gives cleaners and air fresheners an orange scent and acts as a solvent, in the formation of secondary organic aerosols.

By adjusting elements of the test, such as the air exchange rate, which is the number of times per hour indoor air is replaced by outdoor air, as well as the concentrations of terpene and ozone in the chamber, the group was able to ascertain how those variables each affected the formation of secondary organic aerosols.

The cooling effect of aerosols can partly offset global warming on a short - term basis, but many are made of organic material that comes from sources that scientists don't fully understand, said Joost de Gouw, a research physicist at NOAA's Earth System Research Laboratory in Boulder, Colo., who is unaffiliated with the studies.

And while researchers are still striving to fully understand the health and environmental impact of increased levels of secondary organic aerosols in the atmosphere, studies have linked exposure to outdoor aerosols generally to morbidity and mortality outcomes.

With 18 different scenarios tested, the team calculated a range of peak formation of secondary organic aerosols when typical concentrations of limonene were introduced to ozone - rich environments with a range of air exchange rates.

Shiraiwa, M., Pfrang, C., Koop, T., and Pöschl, U.: Kinetic multilayer model of gas - particle interactions in aerosols and clouds (KM - GAP): linking condensation, evaporation and chemical reactions of organics, oxidants and water, Atmospheric Chemistry and Physics, 12, 2777 - 2794, 2012.

The specialized instruments onboard the aircraft sampled the plume for aerosol particle size distribution and composition as well as concentrations of pollutant gases such as sulfur dioxide, nitric oxide, nitrogen dioxide, ozone, and volatile organic compounds (VOCs).

Shiraiwa, M., Ammann, M., Koop, T., and Pöschl, U: Gas uptake and chemical aging of semi-solid organic aerosol particles, Proceedings of the National Academy of Sciences, 108, 11003 - 11008, 2011.

«Photolytic processing of secondary organic aerosols dissolved in cloud droplets.»

Berkemeier, T., S.S. Steimer, U. K. Krieger, T. Peter, U. Pöschl, M. Ammann, and M. Shiraiwa: Ozone uptake on glassy, semi-solid and liquid organic matter and the role of reactive oxygen intermediates in atmospheric aerosol chemistry, Physical Chemistry Chemical Physics 18 (18), 12662 - 12674, 2016.

«Nighttime chemical evolution of aerosol and trace gases in a power plant plume: Implications for secondary organic nitrate and organosulfate aerosol formation, NO3 radical chemistry, and N2O5 heterogeneous hydrolysis.»

New study shows the molecular details of how organic aerosol helps heat up and color the haze over megacities

Song and fellow researchers published research in 2007 that addressed assumptions in the ability of diesel exhaust organic aerosols to mix with organic aerosols from tree evaporate.

On high biomass burning days, both biomass burning and human - based activities equally contributed to levels of secondary organic aerosol downwind of Mexico City.

The largest portion of these submicron aerosols is organic, or carbon - containing, and is classified as two kinds: primary and secondary.

Methods: In a series of experiments, the team synthesized organic aerosols.