Sentences with phrase «organic aerosols»

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.

The team showed that human activities common in large cities, such as vehicle exhaust and municipal trash burning, are major sources of organic aerosol pollution.

Primary organic aerosols are directly given off from combustion systems like exhaust from vehicles, or biomass burning, such as cooking and forest fires.

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

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.

Nearly all models of secondary organic aerosols are tied to observations of their formation in laboratory chamber experiments.

Black carbon and primary organic aerosols are emitted directly into the atmosphere through vehicle exhaust, meat cooking, and biomass burning.

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.

, 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.

On page 760 of this issue, McDonald et al. (3) report that a notable change in emissions may be underway in U.S. cities, with effects on secondary pollutants such as organic aerosols.

Tsigaridis, K., J. Lathière, M. Kanakidou, and D.A. Hauglustaine, 2005: Naturally driven variability in the global secondary organic aerosol over a decade.

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

PNNL scientists found that secondary organic aerosols formed in the presence of the toxic pollutant known as polycyclic aromatic hydrocarbons (PAHs) trapped the PAH molecules inside, shielding them from degradation.

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.

Increased forest biomass would increase VOC emissions and thereby organic aerosol production.

Results: Today's climate models regard organic aerosols as static carbon - based molecules, but scientists at Pacific Northwest National Laboratory and the University of California, Irvine showed that the particles are very dynamic.

The team is also using their 2 - species VBS framework to study organic aerosols and cloud - aerosol interactions for other climate science field campaigns.

«We developed and implemented new modeling approaches based on laboratory measurements to include shielding of toxics by organic aerosols in a global atmosphere model that resulted in large improvements of model predictions,» said PNNL scientist Dr. Manish Shrivastava.

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.

The researchers estimate the mean light - absorbing organic aerosol mass emitted from funeral pyres to be equivalent of approximately 23 percent of the total carbonaceous aerosol mass produced by anthropogenic burning of fossil fuels, and 10 percent of biofuels in the region.

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

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.

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.

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

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

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

Years of results regarding secondary organic aerosols reduce uncertainty in climate projections

«This work brings together theory, lab experiments and field observations to show how viscous organic aerosols can largely elevate global human exposure to toxins by shielding them from chemical degradation in the atmosphere.»

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.

How do organic aerosols from biomass burning, which you can see in the red dots, intersect with clouds and rainfall patterns?

Phase II of the AeroCom project evaluated how 31 different global models handle organic aerosols in the atmosphere, with half now including formation of secondary aerosols from volatile compounds.

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

On a related note I've just noticed there is a large discontinuity in the CanESM2 organic aerosol input from 2000 to 2001 such that the global average loading drops abruptly to a level which is 60 % of the 1850 - 2000 increase.

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.

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

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

Primary organic aerosols, or POAs, are directly emitted into the atmosphere by diesel engine exhausts, forest fires, and other sources.

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.

They are known as organic aerosols, or OA.

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.