The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Allen L Robinson - One of the best experts on this subject based on the ideXlab platform.
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Gas Particle partitioning of primary organic aerosol emissions 3 biomass burning
Journal of Geophysical Research, 2013Co-Authors: Ezra J.t. Levin, Jeffrey L. Collett, Christopher J. Hennigan, Ilona Riipinen, Sonia M Kreidenweis, Jose L Jimenez, Allen L RobinsonAbstract:[1] Atmospheric organic aerosol concentrations depend in part on the Gas-Particle partitioning of primary organic aerosol (POA) emissions. Consequently, heating and dilution were used to investigate the volatility of biomass-burning smoke Particles from combustion of common North American trees/shrubs/grasses during the third Fire Lab at Missoula Experiment. Fifty to eighty percent of the mass of biomass-burning POA evaporated when isothermally diluted from plume- (~1000 µg m−3) to ambient-like concentrations (~10 µg m−3), while roughly 80% of the POA evaporated upon heating to 100°C in a thermodenuder with a residence time of ~14 sec. Therefore, the majority of the POA emissions were semivolatile. Thermodenuder measurements performed at three different residence times indicated that there were not substantial mass transfer limitations to evaporation (i.e., the mass accommodation coefficient appears to be between 0.1 and 1). An evaporation kinetics model was used to derive volatility distributions and enthalpies of vaporization from the thermodenuder data. A single volatility distribution can be used to represent the measured Gas-Particle partitioning from the entire set of experiments, including different fuels, organic aerosol concentrations, and thermodenuder residence times. This distribution, derived from the thermodenuder measurements, also predicts the dilution-driven changes in Gas-Particle partitioning. This volatility distribution and associated emission factors for each fuel studied can be used to update emission inventories and to simulate the Gas-Particle partitioning of biomass-burning POA emissions in chemical transport models.
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Gas-Particle partitioning of primary organic aerosol emissions: (1) Gasoline vehicle exhaust
Atmospheric Environment, 2013Co-Authors: Andrew A. May, Christopher J. Hennigan, Timothy D. Gordon, Albert A. Presto, Ngoc T. Nguyen, Allen L RobinsonAbstract:The Gas-Particle partitioning of the primary organic aerosol (POA) emissions from fifty-one light-duty Gasoline vehicles (model years 1987-2012) was investigated at the California Air Resources Board Haagen-Smit Laboratory. Each vehicle was operated over the cold-start unified cycle on a chassis dynamometer and its emissions were sampled using a constant volume sampler. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: sampling artifact correction of quartz filter data, dilution from the constant volume sampler into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry analysis of quartz filter samples. This combination of techniques allowed Gas-Particle partitioning measurements to be made across a wide range of atmospherically relevant conditions - temperatures of 25-100°C and organic aerosol concentrations of
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Gas-Particle partitioning of primary organic aerosol emissions: 3. Biomass burning
Journal of Geophysical Research Atmospheres, 2013Co-Authors: Andrew A. May, Jeffrey L. Collett, Ezra J.t. Levin, Taehyoung Lee, Christopher J. Hennigan, Ilona Riipinen, Sonia M Kreidenweis, Jose L Jimenez, Allen L RobinsonAbstract:The Gas-Particle partitioning of the primary organic aerosol (POA) emissions from fifty-one light-duty Gasoline vehicles (model years 1987-2012) was investigated at the California Air Resources Board Haagen-Smit Laboratory. Each vehicle was operated over the cold-start unified cycle on a chassis dynamometer and its emissions were sampled using a constant volume sampler. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: sampling artifact correction of quartz filter data, dilution from the constant volume sampler into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry analysis of quartz filter samples. This combination of techniques allowed Gas-Particle partitioning measurements to be made across a wide range of atmospherically relevant conditions - temperatures of 25-100°C and organic aerosol concentrations of
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Gas-Particle partitioning of primary organic aerosol emissions: (2) diesel vehicles
Environmental Science and Technology, 2013Co-Authors: Andrew A. May, Christopher J. Hennigan, Timothy D. Gordon, Albert A. Presto, Ngoc T. Nguyen, Allen L RobinsonAbstract:Experiments were performed to investigate the Gas-Particle partitioning of primary organic aerosol (POA) emissions from two medium-duty (MDDV) and three heavy-duty (HDDV) diesel vehicles. Each test was conducted on a chassis dynamometer with the entire exhaust sampled into a constant volume sampler (CVS). The vehicles were operated over a range of driving cycles (transient, high-speed, creep/idle) on different ultralow sulfur diesel fuels with varying aromatic content. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: artifact correction of quartz filter samples, dilution from the CVS into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry (TD-GC-MS) analysis of quartz filter samples. During tests of vehicles not equipped with diesel particulate filters (DPF), POA concentrations inside the CVS were a factor of 10 greater than ambient levels, which created large and systematic partitioning biases in the emissions data. For low-emitting DPF-equipped vehicles, as much as 90% of the POA collected on a quartz filter from the CVS were adsorbed vapors. Although the POA emission factors varied by more than an order of magnitude across the set of test vehicles, the measured Gas-Particle partitioning of all emissions can be predicted using a single volatility distribution derived from TD-GC-MS analysis of quartz filters. This distribution is designed to be applied directly to quartz filter data that are the basis for existing emissions inventories and chemical transport models that have implemented the volatility basis set approach.
Christopher J. Hennigan - One of the best experts on this subject based on the ideXlab platform.
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Gas Particle partitioning of primary organic aerosol emissions 3 biomass burning
Journal of Geophysical Research, 2013Co-Authors: Ezra J.t. Levin, Jeffrey L. Collett, Christopher J. Hennigan, Ilona Riipinen, Sonia M Kreidenweis, Jose L Jimenez, Allen L RobinsonAbstract:[1] Atmospheric organic aerosol concentrations depend in part on the Gas-Particle partitioning of primary organic aerosol (POA) emissions. Consequently, heating and dilution were used to investigate the volatility of biomass-burning smoke Particles from combustion of common North American trees/shrubs/grasses during the third Fire Lab at Missoula Experiment. Fifty to eighty percent of the mass of biomass-burning POA evaporated when isothermally diluted from plume- (~1000 µg m−3) to ambient-like concentrations (~10 µg m−3), while roughly 80% of the POA evaporated upon heating to 100°C in a thermodenuder with a residence time of ~14 sec. Therefore, the majority of the POA emissions were semivolatile. Thermodenuder measurements performed at three different residence times indicated that there were not substantial mass transfer limitations to evaporation (i.e., the mass accommodation coefficient appears to be between 0.1 and 1). An evaporation kinetics model was used to derive volatility distributions and enthalpies of vaporization from the thermodenuder data. A single volatility distribution can be used to represent the measured Gas-Particle partitioning from the entire set of experiments, including different fuels, organic aerosol concentrations, and thermodenuder residence times. This distribution, derived from the thermodenuder measurements, also predicts the dilution-driven changes in Gas-Particle partitioning. This volatility distribution and associated emission factors for each fuel studied can be used to update emission inventories and to simulate the Gas-Particle partitioning of biomass-burning POA emissions in chemical transport models.
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Gas-Particle partitioning of primary organic aerosol emissions: (1) Gasoline vehicle exhaust
Atmospheric Environment, 2013Co-Authors: Andrew A. May, Christopher J. Hennigan, Timothy D. Gordon, Albert A. Presto, Ngoc T. Nguyen, Allen L RobinsonAbstract:The Gas-Particle partitioning of the primary organic aerosol (POA) emissions from fifty-one light-duty Gasoline vehicles (model years 1987-2012) was investigated at the California Air Resources Board Haagen-Smit Laboratory. Each vehicle was operated over the cold-start unified cycle on a chassis dynamometer and its emissions were sampled using a constant volume sampler. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: sampling artifact correction of quartz filter data, dilution from the constant volume sampler into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry analysis of quartz filter samples. This combination of techniques allowed Gas-Particle partitioning measurements to be made across a wide range of atmospherically relevant conditions - temperatures of 25-100°C and organic aerosol concentrations of
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Gas-Particle partitioning of primary organic aerosol emissions: 3. Biomass burning
Journal of Geophysical Research Atmospheres, 2013Co-Authors: Andrew A. May, Jeffrey L. Collett, Ezra J.t. Levin, Taehyoung Lee, Christopher J. Hennigan, Ilona Riipinen, Sonia M Kreidenweis, Jose L Jimenez, Allen L RobinsonAbstract:The Gas-Particle partitioning of the primary organic aerosol (POA) emissions from fifty-one light-duty Gasoline vehicles (model years 1987-2012) was investigated at the California Air Resources Board Haagen-Smit Laboratory. Each vehicle was operated over the cold-start unified cycle on a chassis dynamometer and its emissions were sampled using a constant volume sampler. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: sampling artifact correction of quartz filter data, dilution from the constant volume sampler into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry analysis of quartz filter samples. This combination of techniques allowed Gas-Particle partitioning measurements to be made across a wide range of atmospherically relevant conditions - temperatures of 25-100°C and organic aerosol concentrations of
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Gas-Particle partitioning of primary organic aerosol emissions: (2) diesel vehicles
Environmental Science and Technology, 2013Co-Authors: Andrew A. May, Christopher J. Hennigan, Timothy D. Gordon, Albert A. Presto, Ngoc T. Nguyen, Allen L RobinsonAbstract:Experiments were performed to investigate the Gas-Particle partitioning of primary organic aerosol (POA) emissions from two medium-duty (MDDV) and three heavy-duty (HDDV) diesel vehicles. Each test was conducted on a chassis dynamometer with the entire exhaust sampled into a constant volume sampler (CVS). The vehicles were operated over a range of driving cycles (transient, high-speed, creep/idle) on different ultralow sulfur diesel fuels with varying aromatic content. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: artifact correction of quartz filter samples, dilution from the CVS into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry (TD-GC-MS) analysis of quartz filter samples. During tests of vehicles not equipped with diesel particulate filters (DPF), POA concentrations inside the CVS were a factor of 10 greater than ambient levels, which created large and systematic partitioning biases in the emissions data. For low-emitting DPF-equipped vehicles, as much as 90% of the POA collected on a quartz filter from the CVS were adsorbed vapors. Although the POA emission factors varied by more than an order of magnitude across the set of test vehicles, the measured Gas-Particle partitioning of all emissions can be predicted using a single volatility distribution derived from TD-GC-MS analysis of quartz filters. This distribution is designed to be applied directly to quartz filter data that are the basis for existing emissions inventories and chemical transport models that have implemented the volatility basis set approach.
Andrew A. May - One of the best experts on this subject based on the ideXlab platform.
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Gas-Particle partitioning of primary organic aerosol emissions: (1) Gasoline vehicle exhaust
Atmospheric Environment, 2013Co-Authors: Andrew A. May, Christopher J. Hennigan, Timothy D. Gordon, Albert A. Presto, Ngoc T. Nguyen, Allen L RobinsonAbstract:The Gas-Particle partitioning of the primary organic aerosol (POA) emissions from fifty-one light-duty Gasoline vehicles (model years 1987-2012) was investigated at the California Air Resources Board Haagen-Smit Laboratory. Each vehicle was operated over the cold-start unified cycle on a chassis dynamometer and its emissions were sampled using a constant volume sampler. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: sampling artifact correction of quartz filter data, dilution from the constant volume sampler into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry analysis of quartz filter samples. This combination of techniques allowed Gas-Particle partitioning measurements to be made across a wide range of atmospherically relevant conditions - temperatures of 25-100°C and organic aerosol concentrations of
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Gas-Particle partitioning of primary organic aerosol emissions: 3. Biomass burning
Journal of Geophysical Research Atmospheres, 2013Co-Authors: Andrew A. May, Jeffrey L. Collett, Ezra J.t. Levin, Taehyoung Lee, Christopher J. Hennigan, Ilona Riipinen, Sonia M Kreidenweis, Jose L Jimenez, Allen L RobinsonAbstract:The Gas-Particle partitioning of the primary organic aerosol (POA) emissions from fifty-one light-duty Gasoline vehicles (model years 1987-2012) was investigated at the California Air Resources Board Haagen-Smit Laboratory. Each vehicle was operated over the cold-start unified cycle on a chassis dynamometer and its emissions were sampled using a constant volume sampler. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: sampling artifact correction of quartz filter data, dilution from the constant volume sampler into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry analysis of quartz filter samples. This combination of techniques allowed Gas-Particle partitioning measurements to be made across a wide range of atmospherically relevant conditions - temperatures of 25-100°C and organic aerosol concentrations of
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Gas-Particle partitioning of primary organic aerosol emissions: (2) diesel vehicles
Environmental Science and Technology, 2013Co-Authors: Andrew A. May, Christopher J. Hennigan, Timothy D. Gordon, Albert A. Presto, Ngoc T. Nguyen, Allen L RobinsonAbstract:Experiments were performed to investigate the Gas-Particle partitioning of primary organic aerosol (POA) emissions from two medium-duty (MDDV) and three heavy-duty (HDDV) diesel vehicles. Each test was conducted on a chassis dynamometer with the entire exhaust sampled into a constant volume sampler (CVS). The vehicles were operated over a range of driving cycles (transient, high-speed, creep/idle) on different ultralow sulfur diesel fuels with varying aromatic content. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: artifact correction of quartz filter samples, dilution from the CVS into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry (TD-GC-MS) analysis of quartz filter samples. During tests of vehicles not equipped with diesel particulate filters (DPF), POA concentrations inside the CVS were a factor of 10 greater than ambient levels, which created large and systematic partitioning biases in the emissions data. For low-emitting DPF-equipped vehicles, as much as 90% of the POA collected on a quartz filter from the CVS were adsorbed vapors. Although the POA emission factors varied by more than an order of magnitude across the set of test vehicles, the measured Gas-Particle partitioning of all emissions can be predicted using a single volatility distribution derived from TD-GC-MS analysis of quartz filters. This distribution is designed to be applied directly to quartz filter data that are the basis for existing emissions inventories and chemical transport models that have implemented the volatility basis set approach.
Ilona Riipinen - One of the best experts on this subject based on the ideXlab platform.
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Gas Particle partitioning of primary organic aerosol emissions 3 biomass burning
Journal of Geophysical Research, 2013Co-Authors: Ezra J.t. Levin, Jeffrey L. Collett, Christopher J. Hennigan, Ilona Riipinen, Sonia M Kreidenweis, Jose L Jimenez, Allen L RobinsonAbstract:[1] Atmospheric organic aerosol concentrations depend in part on the Gas-Particle partitioning of primary organic aerosol (POA) emissions. Consequently, heating and dilution were used to investigate the volatility of biomass-burning smoke Particles from combustion of common North American trees/shrubs/grasses during the third Fire Lab at Missoula Experiment. Fifty to eighty percent of the mass of biomass-burning POA evaporated when isothermally diluted from plume- (~1000 µg m−3) to ambient-like concentrations (~10 µg m−3), while roughly 80% of the POA evaporated upon heating to 100°C in a thermodenuder with a residence time of ~14 sec. Therefore, the majority of the POA emissions were semivolatile. Thermodenuder measurements performed at three different residence times indicated that there were not substantial mass transfer limitations to evaporation (i.e., the mass accommodation coefficient appears to be between 0.1 and 1). An evaporation kinetics model was used to derive volatility distributions and enthalpies of vaporization from the thermodenuder data. A single volatility distribution can be used to represent the measured Gas-Particle partitioning from the entire set of experiments, including different fuels, organic aerosol concentrations, and thermodenuder residence times. This distribution, derived from the thermodenuder measurements, also predicts the dilution-driven changes in Gas-Particle partitioning. This volatility distribution and associated emission factors for each fuel studied can be used to update emission inventories and to simulate the Gas-Particle partitioning of biomass-burning POA emissions in chemical transport models.
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Gas-Particle partitioning of primary organic aerosol emissions: 3. Biomass burning
Journal of Geophysical Research Atmospheres, 2013Co-Authors: Andrew A. May, Jeffrey L. Collett, Ezra J.t. Levin, Taehyoung Lee, Christopher J. Hennigan, Ilona Riipinen, Sonia M Kreidenweis, Jose L Jimenez, Allen L RobinsonAbstract:The Gas-Particle partitioning of the primary organic aerosol (POA) emissions from fifty-one light-duty Gasoline vehicles (model years 1987-2012) was investigated at the California Air Resources Board Haagen-Smit Laboratory. Each vehicle was operated over the cold-start unified cycle on a chassis dynamometer and its emissions were sampled using a constant volume sampler. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: sampling artifact correction of quartz filter data, dilution from the constant volume sampler into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry analysis of quartz filter samples. This combination of techniques allowed Gas-Particle partitioning measurements to be made across a wide range of atmospherically relevant conditions - temperatures of 25-100°C and organic aerosol concentrations of
Ezra J.t. Levin - One of the best experts on this subject based on the ideXlab platform.
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Gas Particle partitioning of primary organic aerosol emissions 3 biomass burning
Journal of Geophysical Research, 2013Co-Authors: Ezra J.t. Levin, Jeffrey L. Collett, Christopher J. Hennigan, Ilona Riipinen, Sonia M Kreidenweis, Jose L Jimenez, Allen L RobinsonAbstract:[1] Atmospheric organic aerosol concentrations depend in part on the Gas-Particle partitioning of primary organic aerosol (POA) emissions. Consequently, heating and dilution were used to investigate the volatility of biomass-burning smoke Particles from combustion of common North American trees/shrubs/grasses during the third Fire Lab at Missoula Experiment. Fifty to eighty percent of the mass of biomass-burning POA evaporated when isothermally diluted from plume- (~1000 µg m−3) to ambient-like concentrations (~10 µg m−3), while roughly 80% of the POA evaporated upon heating to 100°C in a thermodenuder with a residence time of ~14 sec. Therefore, the majority of the POA emissions were semivolatile. Thermodenuder measurements performed at three different residence times indicated that there were not substantial mass transfer limitations to evaporation (i.e., the mass accommodation coefficient appears to be between 0.1 and 1). An evaporation kinetics model was used to derive volatility distributions and enthalpies of vaporization from the thermodenuder data. A single volatility distribution can be used to represent the measured Gas-Particle partitioning from the entire set of experiments, including different fuels, organic aerosol concentrations, and thermodenuder residence times. This distribution, derived from the thermodenuder measurements, also predicts the dilution-driven changes in Gas-Particle partitioning. This volatility distribution and associated emission factors for each fuel studied can be used to update emission inventories and to simulate the Gas-Particle partitioning of biomass-burning POA emissions in chemical transport models.
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Gas-Particle partitioning of primary organic aerosol emissions: 3. Biomass burning
Journal of Geophysical Research Atmospheres, 2013Co-Authors: Andrew A. May, Jeffrey L. Collett, Ezra J.t. Levin, Taehyoung Lee, Christopher J. Hennigan, Ilona Riipinen, Sonia M Kreidenweis, Jose L Jimenez, Allen L RobinsonAbstract:The Gas-Particle partitioning of the primary organic aerosol (POA) emissions from fifty-one light-duty Gasoline vehicles (model years 1987-2012) was investigated at the California Air Resources Board Haagen-Smit Laboratory. Each vehicle was operated over the cold-start unified cycle on a chassis dynamometer and its emissions were sampled using a constant volume sampler. Four independent yet complementary approaches were used to investigate POA Gas-Particle partitioning: sampling artifact correction of quartz filter data, dilution from the constant volume sampler into a portable environmental chamber, heating in a thermodenuder, and thermal desorption/Gas chromatography/mass spectrometry analysis of quartz filter samples. This combination of techniques allowed Gas-Particle partitioning measurements to be made across a wide range of atmospherically relevant conditions - temperatures of 25-100°C and organic aerosol concentrations of
