Sentences with phrase «soa formation»

The climate feedbacks involved with these changes, which are key in understanding the climate system as a whole, include: + the importance of aerosol absorption on climate + the impact of aerosol deposition which affects biology and, hence, emissions of aerosols and aerosol precursors via organic nitrogen, organic phosphorus and iron fertilization + the importance of land use and land use changes on natural and anthropogenic aerosol sources + the SOA sources and impact on climate, with special attention on the impact human activities have on natural SOA formation In order to quantitatively answer such questions I perform simulations of the past, present and future atmospheres, and make comparisons with measurements and remote sensing data, all of which help understand, evaluate and improve the model's parameterizations and performance, and our understanding of the Earth system.

In order to capture the magnitude, seasonality, and the OA physical and chemical properties, several global models now treat SOA as semi-volatile, based on an continuously increasing amount of experimental data on SOA formation in the atmosphere.

In collaboration with scientists at the National Oceanic and Atmospheric Administration's (NOAA) Geophysical Fluid Dynamics Laboratory and several universities, this position will help develop a new set of chemical mechanism for biogenic VOC oxidation and SOA formation.

Biogenic SOA formation through gas - phase oxidation and gas - to - particle partitioning — Comparison between process models of varying complexity.

These data indicate that under many atmospherically - relevant conditions SOA particles are significantly more viscous and orders of magnitude less volatile than assumed in traditional modeling approaches; SOA formation yields can be significantly higher than previously reported values; and anthropogenic pollution enhance loadings of SOA from biogenic precursors.

«Together, our studies of evaporation rates and viscosity provide incontrovertible experimental data that the assumptions invoked to model SOA formation and evolution are fundamentally flawed,» said Dr. Alla Zelenyuk, the PNNL chemist who led the study.

These papers and similar findings published led to a paradigm shift in the way models describe SOA formation and evaporation, including a new treatment of SOA that is currently being implemented in DOE's Accelerated Climate Model for Energy (ACME).

«We found that one of the biggest factors contributing to SOA formation by limonene ozonolysis was the air exchange rate,» Waring said.

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.

Accurately simulating the impacts of SOA on climate requires understanding the chemical processes that lead to SOA formation in the atmosphere under a wide variety of environmental conditions.

The complexities of the relationship need to be included in the next generation of models to accurately predict the dynamics of SOA formation and composition in different environments.

Not exact matches

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.

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.

Few researchers, however, have considered the formation of SOAs in our indoor environments.

Session Description: Recent laboratory and field studies provide new insights into the formation, growth, phase, viscosity, and volatility of secondary organic aerosols (SOA).

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

My studies range from detailed aerosol processes such as the formation of secondary organic aerosols (SOA), to centennial time scale climate variability related to natural variability and external forcings.