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Effects of model resolution on the interpretation of satellite NO<sub>2</sub> observations
Copernicus GmbH - Tập 11 Số 22 - Trang 11647-11655
L. C. Valin, A. R. Russell, R. C. Hudman, R. C. Cohen
Abstract. Inference of NOx emissions (NO+NO2) from satellite observations of tropospheric NO2 column requires knowledge of NOx lifetime, usually provided by chemical transport models (CTMs). However, it is known that species subject to non-linear sources or sinks, such as ozone, are susceptible to biases in coarse-resolution CTMs. Here we compute the resolution-dependent bias in predicted ...... hiện toàn bộ
Impact of model grid spacing on regional- and urban- scale air quality predictions of organic aerosol
Copernicus GmbH - Tập 11 Số 7 - Trang 3107-3118
Craig Stroud, Paul A. Makar, Michael D. Moran, Wei Gong, Sunling Gong, Jiangyi Zhang, Katherine Hayden, C. Mihele, Jeffrey R. Brook, Jonathan P. D. Abbatt, Jay G. Slowik
Abstract. Regional-scale chemical transport model predictions of urban organic aerosol to date tend to be biased low relative to observations, a limitation with important implications for applying such models to human exposure health studies. We used a nested version of Environment Canada's AURAMS model (42- to- 15- to- 2.5-km nested grid spacing) to predict organic aerosol concentrations ...... hiện toàn bộ
Evolution of the chemical fingerprint of biomass burning organic aerosol during aging
Copernicus GmbH - Tập 18 Số 10 - Trang 7607-7624
Amélie Bertrand, Giulia Stefenelli, Coty N. Jen, Simone M. Pieber, Emily A. Bruns, Haiyan Ni, Brice Temime‐Roussel, Jay G. Slowik, A. H. Goldstein, Imad El Haddad, Urs Baltensperger, Andrê S. H. Prévôt, Henri Wortham, Nicolas Marchand
Abstract. A thermal desorption aerosol gas chromatograph coupled to a high resolution – time of flight – aerosol mass spectrometer (TAG-AMS) was connected to an atmospheric chamber for the molecular characterization of the evolution of organic aerosol (OA) emitted by woodstove appliances for residential heating. Two log woodstoves (old and modern) and one pellet stove were operated under t...... hiện toàn bộ
Bulk and molecular-level characterization of laboratory-aged biomass burning organic aerosol from oak leaf and heartwood fuels
Copernicus GmbH - Tập 18 Số 3 - Trang 2199-2224
Claire Fortenberry, Michael J. Walker, Yaping Zhang, Dhruv Mitroo, W. H. Brune, Brent J. Williams
Abstract. The chemical complexity of biomass burning organic aerosol (BBOA) greatly increases with photochemical aging in the atmosphere, necessitating controlled laboratory studies to inform field observations. In these experiments, BBOA from American white oak (Quercus alba) leaf and heartwood samples was generated in a custom-built emissions and combustion chamber and photochemically ag...... hiện toàn bộ
Understanding evolution of product composition and volatility distribution through in-situ GC <b>×</b> GC analysis: a case study of longifolene ozonolysis
Copernicus GmbH - Tập 11 Số 11 - Trang 5335-5346
Gabriel Isaacman‐VanWertz, David R. Worton, Nathan M. Kreisberg, Christopher J. Hennigan, A. P. Teng, Susanne V. Hering, Allen L. Robinson, Neil M. Donahue, A. H. Goldstein
Abstract. A method for predicting volatility and polarity based on chromatographic information was developed and applied to the smog chamber ozonolysis of the sesquiterpene longifolene. The products were collected and analyzed using a GC × GC Thermal Desorption Aerosol Gas Chromatograph/Mass Spectrometer (2D-TAG) and a quadrupole Aerodyne Aerosol Mass Spectrometer (AMS). All the secondary ...... hiện toàn bộ
The vertical distribution of aerosols, Saharan dust and cirrus clouds in Rome (Italy) in the year 2001
Copernicus GmbH - Tập 4 Số 2 - Trang 351-359
Gian Paolo Gobbi, Francesca Barnaba, L. Ammannato
Abstract. A set of 813 lidar profiles of tropospheric aerosol and cirrus clouds extinction and depolarization observed in Rome, Italy, between February 2001 and February 2002 is analyzed and discussed. The yearly record reveals a meaningful contribution of both cirrus clouds (38%) and Saharan dust (12%) to the total optical thickness (OT) of 0.26, at 532nm. Seasonal analysis shows the plan...... hiện toàn bộ
Mexico City aerosol analysis during MILAGRO using high resolution aerosol mass spectrometry at the urban supersite (T0) – Part 1: Fine particle composition and organic source apportionment
Copernicus GmbH - Tập 9 Số 17 - Trang 6633-6653
A. C. Aiken, D. Salcedo, M. J. Cubison, J. A. Huffman, P. F. DeCarlo, I. M. Ulbrich, K. S. Docherty, D. Sueper, J. R. Kimmel, D. R. Worsnop, A. Trimborn, M. J. Northway, E. A. Stone, J. J. Schauer, Rainer Volkamer, Edward C. Fortner, B. de Foy, J. Wang, Alexander Laskin, V. Shutthanandan, J. Zheng, Renyi Zhang, J. S. Gaffney, N. A. Marley, G. Paredes-Miranda, W. P. Arnott, L. T. Molina, G. Sosa, J. L. Jimenez
Abstract. Submicron aerosol was analyzed during the MILAGRO field campaign in March 2006 at the T0 urban supersite in Mexico City with a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) and complementary instrumentation. Mass concentrations, diurnal cycles, and size distributions of inorganic and organic species are similar to results from the CENICA supersite in April...... hiện toàn bộ
Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: results from the CENICA Supersite
Copernicus GmbH - Tập 6 Số 4 - Trang 925-946
D. Salcedo, T. B. Onasch, K. Džepina, Manjula R. Canagaratna, Q. Zhang, J. A. Huffman, P. F. DeCarlo, John T. Jayne, Penelope Mortimer, Douglas R. Worsnop, C. E. Kolb, K. S. Johnson, B. Zuberi, Linsey C. Marr, Rainer Volkamer, L. T. Molina, Mario J. Molina, B. Cárdenas, R. M. Bernabé, C. Márquez, J. S. Gaffney, N. A. Marley, Alexander Laskin, V. Shutthanandan, YuLong Xie, W. H. Brune, R. Lesher, Terry Shirley, J. L. Jiménez
Abstract. An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, during the Mexico City Metropolitan Area field study (MCMA-2003) from 31 March-4 May 2003 to investigate particle concentrations, sources, and processes. The AMS provides real time information on mass concentration and composition of the non-refractory species in particulate matter less than 1 µm (N...... hiện toàn bộ
Gas-particle interactions above a Dutch heathland: I. Surface exchange fluxes of NH<sub>3</sub>, SO<sub>2</sub>, HNO<sub>3</sub> and HCl
Copernicus GmbH - Tập 4 Số 4 - Trang 989-1005
Eiko Nemitz, Mark A. Sutton, G.P. Wyers, P. A. C. Jongejan
Abstract. A field measurement campaign was carried out over a Dutch heathland to investigate the effect of gas-to-particle conversion and ammonium aerosol evaporation on surface/atmosphere fluxes of ammonia and related species. Continuous micrometeorological measurements of the surface exchange of NH3, SO2, HNO3 and HCl were made and are analyzed here with regard to average fluxes, deposit...... hiện toàn bộ
Long-term historical trends in air pollutant emissions in Asia: Regional Emission inventory in ASia (REAS) version 3
Copernicus GmbH - Tập 20 Số 21 - Trang 12761-12793
Junichi Kurokawa, Toshimasa Ohara
Abstract. A long-term historical emission inventory of air and climate pollutants in East, Southeast, and South Asia during 1950–2015 was developed as the Regional Emission inventory in ASia version 3 (REASv3). REASv3 provides details of emissions from major anthropogenic sources for each country and its sub-regions and also provides monthly gridded data with 0.25∘ × 0.25∘ resolution. The ...... hiện toàn bộ
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