Sentences with phrase «organic aerosol»

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

Observational evidence suggests that some organic aerosol compounds from fossil fuels are relatively weakly absorbing but do absorb solar radiation at some ultraviolet and visible wavelengths (e.g., Bond et al., 1999; Jacobson, 1999; Bond, 2001) although organic aerosol from high - temperature combustion such as fossil fuel burning (Dubovik et al., 1998; Kirchstetter et al., 2004) appears less absorbing than from low - temperature combustion such as open biomass burning.

My earlier research has concerned, among others things, the use and the reliability of LES, the application of nonlinear time series analysis on flow fields, and the inclusion of marine organic aerosol sources in global climate models.

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

The present 3 - D modeling study focuses on aerosol chemical composition change since preindustrial times considering the secondary organic aerosol formation together with all other main aerosol components including nitrate.

This information is synthesized to provide a continuous analysis of the flow from the emitted material to the atmosphere up to the point of the climate impact of the produced organic aerosol.

Tsigaridis, K., and M. Kanakidou, 2003: Global modelling of secondary organic aerosol in the troposphere: A sensitivity analysis.

Tsigaridis, K., and M. Kanakidou, 2007: Secondary organic aerosol importance in the future atmosphere.

The data generated in this laboratory is used to reduce the uncertainty associated with representing the organic aerosol lifecycle in climate models.

In general, primary aerosol components (black carbon, hydrocarbon - like organic aerosol and biomass burning organic aerosol) dominated the local traffic and wood burning emissions whereas secondary components (oxygenated organic aerosol, nitrate, ammonium, and sulfate) dominated the PM1 chemical composition during the LRT episode.

The successful candidate will study secondary organic aerosol (SOA) formation from the oxidation of biogenic volatile organic compounds (VOCs).

New information from dedicated recent and future field campaigns is expected to shed light on organic aerosol formation processes and how they are altered in the presence of anthropogenic pollution.

At left, the composite annual mean organic aerosol surface air concentrations of the models, defined as the median of the model fields on a 5 ° × 5 ° grid.

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.

Research shows the Clean Air Act was likely responsible for a dramatic decline in atmospheric organic aerosol.

Effect of pellet boiler exhaust on secondary organic aerosol formation from α - pinene.

BC FF is for black carbon from fossil fuel and biofuel, POA FF is for primary organic aerosol from fossil fuel and biofuel, BB is for biomass burning aerosols and SOA is for secondary organic aerosols.»

However, because of its acidity, H2SO4 (and potentially MSA) can enhance the formation and growth of secondary organic aerosol (SOA) from organic compounds (5, 44, 45), including those produced by homogeneous nucleation of low - volatility species (46).

The formation, properties and impact of secondary organic aerosol: Current and emerging issues

Direct radiative feedback due to biogenic secondary organic aerosol estimated from boreal forest site observations.

The direct and indirect radiative effects of biogenic secondary organic aerosol.

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.

The organic aerosol particles that coat the toxic hitchhikers are wafted into the atmosphere through emissions from trees (like those that produce the smell of pine trees), and burning biomass and fossil fuel to form a semi-solid sap - like casing surrounding and protecting the particle's payload from breaking down in the atmosphere.

Analyses of the ground and aircraft data performed by Setyan et al. (2012), Shilling et al. (2013), and Kleinman et al. (2016) showed that organic aerosol production increased when human - caused emissions from Sacramento mixed with air rich in isoprene, an organic compound wafting from many plants that originate in the area's foothills.

When isoprene is in the presence of human - made sulfate particles it transforms into atmospheric organic aerosol particles.

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 team injected citric, adipic, and fulvic acid into the chamber as seed aerosols, and then introduced a secondary organic aerosol from α - pinene, a carbon - containing compound derived from pine trees.

Study reveals discrepancy in approach commonly used to model organic aerosol formation at global scales

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

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.

, Kilcoyne, A.L.D., Moffet, R.C., Weigand, M., Martin, S.T., Pöschl, U., and Andreae, M.O.: Biogenic potassium salt particles as seeds for secondary organic aerosol in the Amazon, Science, 337, 1075 - 1078, 2012.

Their reaction products form the so - called secondary organic aerosol.

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

Even though open windows bring in more ozone from outside, the reduction in the indoor limonene concentration and SOA formation strength more than make up for it, as less secondary organic aerosol is formed inside.

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

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

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.

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

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.

The rapidly formed reaction products are usually very non-volatile and are precursors for the secondary organic aerosol, which is important for the earth's 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.

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.

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

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.

Secondary organic aerosols are formed primarily through chemistry that occurs in the gas phase.

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.

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

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.