A5041772572- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Atmospheric aerosols and clouds
- Vehicle emissions and performance
- Indoor Air Quality and Microbial Exposure
- Wind and Air Flow Studies
- Atmospheric and Environmental Gas Dynamics
- Chemical Thermodynamics and Molecular Structure
- Mass Spectrometry Techniques and Applications
- Plant responses to elevated CO2
- Odor and Emission Control Technologies
- Maritime Transport Emissions and Efficiency
- Analytical chemistry methods development
- Toxic Organic Pollutants Impact
- Analytical Chemistry and Sensors
- Oil Spill Detection and Mitigation
- Urban Heat Island Mitigation
- Cyclone Separators and Fluid Dynamics
- Advanced Combustion Engine Technologies
- Advanced Chemical Sensor Technologies
- Phase Equilibria and Thermodynamics
- Catalytic Processes in Materials Science
- Advanced Chemical Physics Studies
Hamad bin Khalifa University
2021-2024
Qatar Foundation
2021-2024
University of Manchester
2014-2023
National Centre for Atmospheric Science
2014-2023
Environmental Earth Sciences
2020
Paul Scherrer Institute
2005-2010
Swiss Federal Laboratories for Materials Science and Technology
2007-2008
Aerodyne Research
2005-2008
Cooperative Institute for Research in Environmental Sciences
2005-2008
University at Albany, State University of New York
2008
Framework for Change Organic aerosols make up 20 to 90% of the particulate mass troposphere and are important factors in both climate human heath. However, their sources removal pathways very uncertain, atmospheric evolution is poorly characterized. Jimenez et al. (p. 1525 ; see Perspective by Andreae ) present an integrated framework organic aerosol compositional atmosphere, based on model results field laboratory data that simulate dynamic aging behavior aerosols. Particles become more...
Organic aerosol (OA) data acquired by the Aerosol Mass Spectrometer (AMS) in 37 field campaigns were deconvolved into hydrocarbon‐like OA (HOA) and several types of oxygenated (OOA) components. HOA has been linked to primary combustion emissions (mainly from fossil fuel) other sources such as meat cooking. OOA is ubiquitous various atmospheric environments, on average accounting for 64%, 83% 95% total urban, urban downwind, rural/remote sites, respectively. A case study analysis a rural site...
The application of mass spectrometric techniques to the real-time measurement and characterization aerosols represents a significant advance in field atmospheric science. This review focuses on aerosol spectrometer (AMS), an instrument designed developed at Aerodyne Research, Inc. (ARI) that is most widely used thermal vaporization AMS. AMS uses aerodynamic lens inlet technology together with electron-impact spectrometry measure non-refractory (NR) chemical speciation loading as function...
A recently developed method to rapidly quantify the elemental composition of bulk organic aerosols (OA) using a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) is improved and applied ambient measurements. Atomic oxygen-to-carbon (O/C) ratios characterize oxidation state OA, O/C from urban OA ranges 0.2 0.8 with diurnal cycle that decreases primary emissions increases because photochemical processing secondary (SOA) production. Regional approaches ∼0.9. The...
A source apportionment study was performed for particulate matter in the small village of Roveredo, Switzerland, where more than 70% households use wood burning heating purposes. two-lane trans-Alpine highway passes through and contributes to total aerosol burden area. The is located a steep Alpine valley characterized by strong persistent temperature inversions during winter, especially from December February. During two winter one early spring campaigns, seven-wavelength aethalometer, high...
Abstract. Submicron ambient aerosol was characterized in summer 2005 at an urban background site Zurich, Switzerland, during a three-week measurement campaign. Highly time-resolved samples of non-refractory components were analyzed with Aerodyne mass spectrometer (AMS). Positive matrix factorization (PMF) used for the first time spectra to identify main total organic and their sources. The PMF retrieved factors compared measured reference correlated tracer species gas phase measurements from...
A new technique has been developed to deconvolve and quantify the mass concentrations of hydrocarbon-like oxygenated organic aerosols (HOA OOA) using highly time-resolved spectra obtained with an Aerodyne Aerosol Mass Spectrometer (AMS). This involves a series multivariate linear regressions that use mass-to-charge ratios (m/z's) 57 (mostly C4H9+) 44 CO2+)the identified AMS spectral tracers for HOA OOA, respectivelyas initial principal components. Two algorithms have developed: algorithm 1...
The aerosol mass spectrometer (AMS), manufactured by Aerodyne Research, Inc., has been shown to be capable of delivering quantitative information on the chemical composition and size volatile semivolatile fine airborne particulate matter with high time resolution. Analytical software tools for interpreting data from this instrument generating meaningful, results have developed are presented here a brief description instrument. These include conversion detected ion rates quadrupole during...
Throughout the winter months, village of Roveredo, Switzerland, frequently experiences strong temperature inversions that contribute to elevated levels particulate matter. Wood is used as fuel for 75% domestic heating installations in which makes it a suitable location study wood burning emissions atmosphere winter. An Aerodyne quadrupole aerosol mass spectrometer (Q-AMS) was characterize composition submicrometer, non-refractory particles at this during two field campaigns March and...
Abstract. A hygroscopicity tandem differential mobility analyzer (HTDMA) was used to measure the water uptake (hygroscopicity) of secondary organic aerosol (SOA) formed during chemical and photochemical oxidation several precursors in a smog chamber. Electron ionization mass spectra non-refractory submicron were simultaneously determined with an spectrometer (AMS), correlations between two different signals investigated. SOA found strongly correlate relative abundance ion signal m/z 44...
Real-time measurements of submicrometer aerosol were performed using an Aerodyne mass spectrometer (AMS) during three weeks at urban background site in Zurich (Switzerland) January 2006. A hybrid receptor model which incorporates a priori known source composition was applied to the AMS highly time-resolved organic spectra. Three sources and components aerosols identified: major component oxygenated (OOA), mostly representing secondary accounting on average for 52–57% particulate mass....
Abstract. Real-time measurements of non-refractory submicron aerosols (NR-PM1) were conducted within the greater Alpine region (Switzerland, Germany, Austria, France and Liechtenstein) during several week-long field campaigns in 2002–2009. This represents one most important economic recreational spaces Europe. A large variety sites was covered including urban backgrounds, motorways, rural, remote, high-alpine stations, also mobile on-road performed. Inorganic organic aerosol (OA) fractions...
Abstract. As has been the case in North America and western Europe, SO2 emissions have substantially reduced China Plain (NCP) recent years. Differential rates of reduction NOx concentrations result frequent occurrence particulate matter pollution dominated by nitrate (pNO3-) over NCP. In this study, we observed a polluted episode with mass fraction nonrefractory PM1 (NR-PM1) being up to 44 % during wintertime Beijing. Based on typical pNO3--dominated haze event, linkage between aerosol...
Abstract. Renewal of ultrafine aerosols in the marine boundary layer may lead to repopulation distribution and ultimately determine concentration cloud condensation nuclei (CCN). Thus formation nanometre-scale particles can enhanced scattering incoming radiation a net cooling atmosphere. The recent demonstration chamber new from photolytic production condensable iodine-containing compounds diiodomethane (CH2I2), (O'Dowd et al., 2002; Kolb, Jimenez 2003a; Burkholder Ravishankara, 2003),...
Abstract. An Aerodyne Aerosol Mass Spectrometer (AMS) has been utilised to provide on-line measurements of the mass spectral signatures and size distributions oxidation products resulting from irradiating 1,3,5-trimethylbenzene (1,3,5-TMB) α-pinene, separately, in presence nitrogen oxide, dioxide propene a reaction chamber. results indicate that both precursors produce SOA with broadly similar chemical functionality highly oxidised nature. However, significant differences occur minor...
Secondary organic aerosol (SOA) formation from the photooxidation of an anthropogenic (1,3,5-trimethylbenzene) and a biogenic (α-pinene) precursor was investigated at new PSI smog chamber. The chemistry gas phase followed by proton transfer reaction mass spectrometry, while with ion chromatography, laser desorption ionization infrared spectroscopy, along volatility hygroscopicity studies. Evidence for oligomer SOA both precursors given increasing abundance compounds high molecular weight (up...
In part 1 of this series, techniques for generating quantitative information on fine airborne particulate‐size and chemically resolved mass concentration from an Aerodyne aerosol spectrometer were introduced. Presented here are the results generated using these sampling U.K. urban air with such instrument in Edinburgh during October 2000 Manchester July 2001 January 2002. Data total concentrations size‐resolved distributions nitrate, sulfate, organic compounds obtained all three campaigns...
Abstract. Aerosol physical and chemical properties trace gas concentrations were measured during the QUEST field campaign in March–April 2003, Hyytiälä, Finland. Our aim was to understand role of oxidation products VOC's such as mono- sesquiterpenes atmospheric nucleation events. Particle compositions using Aerodyne Mass Spectrometer, aerosol samples collected with low-pressure impactors a high volume sampler analysed number techniques. The results indicate that after new particle formation,...
Within the project AEROWOOD (Aerosols from wood burning versus other sources), particulate matter was collected at two Swiss Alpine valleys during winter. Apportionment of aerosols transit traffic and residential performed using radiocarbon ( 14 C) determinations organic carbon (OC) elemental (EC) fractions. On daily average, 88% 65% total carbonaceous (including all atoms than carbon) originated non‐fossil sources inside outside village, respectively, which is mainly attributed to burning....
Cloud droplets form by nucleation on atmospheric aerosol particles. Populations of such particles invariably contain organic material, a major source which is thought to be condensation photo‐oxidation products biogenic volatile compounds (VOCs). We demonstrate that smog chamber studies the formation secondary (SOA) formed during must conducted at near concentrations yield atmospherically representative particle composition, hygroscopicity and cloud‐forming potential. Under these conditions,...
Wood‐burning for domestic heating purposes is becoming more important owing to the increasing use of wood as a renewable fuel. Particle emissions from residential combustion contribute substantially particulate matter during winter. An Aerodyne quadrupole aerosol mass spectrometer was used study variability spectra organic particles emitted burning different types function conditions and technologies. Previously found wood‐burning fragment markers in ambient air levoglucosan such m/z 60, 73,...