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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 NO2 colu... 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 for a te... hiện toàn bộ
Organic aerosol and global climate modelling: a review
Copernicus GmbH - Tập 5 Số 4 - Trang 1053-1123
Maria Kanakidou, John H. Seinfeld, Spyros Ν. Pandis, Ian Barnes, Frank Dentener, M. C. Facchini, Rita Van Dingenen, Barbara Ervens, Athanasios Nenes, Claus J. Nielsen, Erik Swietlicki, J.-P. Putaud, Yves Balkanski, S. Fuzzi, Jean-Claude Horth, G. K. Moortgat, Richard Winterhalter, Cathrine Lund Myhre, Kostas Tsigaridis, E. Vignati, Euripides G. Stephanou, J. Wilson
Abstract. The present paper reviews existing knowledge with regard to Organic Aerosol (OA) of importance for global climate modelling and defines critical gaps needed to reduce the involved uncertainties. All pieces required for the representation of OA in a global climate model are sketched out with special attention to Secondary Organic Aerosol (SOA): The emission estimates of primary carbonaceo... hiện toàn bộ
Observations of sesquiterpenes and their oxidation products in central Amazonia during the wet and dry seasons
Copernicus GmbH - Tập 18 Số 14 - Trang 10433-10457
Lindsay D. Yee, Gabriel Isaacman‐VanWertz, Rebecca A. Wernis, Meng Meng, Ventura Rivera, Nathan M. Kreisberg, Susanne V. Hering, Mads S. Bering, Marianne Glasius, Mary Alice Upshur, Ariana Gray Bé, Regan J. Thomson, Franz M. Geiger, John H. Offenberg, Michael Lewandowski, Ivan Kourtchev, Markus Kalberer, Suzane de Sá, Scot T. Martin, M. Lizabeth Alexander, Brett B. Palm, Weiwei Hu, Pedro Campuzano‐Jost, D. A. Day, J. L. Jiménez, Yingjun Liu, K. A. McKinney, Paulo Artaxo, Gunilla Svensson, Antônio O. Manzi, Maria Betânia Leal de Oliveira, Rodrigo Augusto Ferreira De Souza, Luiz A. T. Machado, K. Longo, A. H. Goldstein
Abstract. Biogenic volatile organic compounds (BVOCs) from the Amazon forest region represent the largest source of organic carbon emissions to the atmosphere globally. These BVOC emissions dominantly consist of volatile and intermediate-volatility terpenoid compounds that undergo chemical transformations in the atmosphere to form oxygenated condensable gases and secondary organic aerosol (SOA). W... 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 typical c... 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 aged in a ... hiện toàn bộ
Major components of atmospheric organic aerosol in southern California as determined by hourly measurements of source marker compounds
Copernicus GmbH - Tập 10 Số 23 - Trang 11577-11603
Brent J. Williams, A. H. Goldstein, Nathan M. Kreisberg, Susanne V. Hering, Douglas R. Worsnop, I. M. Ulbrich, Kenneth S. Docherty, J. L. Jiménez
Abstract. We report the first hourly in-situ measurements of speciated organic aerosol (OA) composition in an urban environment. Field measurements were made in southern California at the University of California–Riverside during the 2005 Study of Organic Aerosol at Riverside (SOAR), which included two separate measurement periods: a summer study (15 July–15 August) and a fall study (31 October–28... 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 organic ... 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 planetary bo... hiện toàn bộ
An overview of the MILAGRO 2006 Campaign: Mexico City emissions and their transport and transformation
Copernicus GmbH - Tập 10 Số 18 - Trang 8697-8760
L. T. Molina, S. Madronich, J. S. Gaffney, E. C. Apel, B. de Foy, Jerome D. Fast, R. A. Ferrare, S. C. Herndon, J. L. Jiménez, Brian Lamb, Álvaro Osornio-Vargas, P. B. Russell, James J. Schauer, P. S. Stevens, Rainer Volkamer, M. Zavala
Abstract. MILAGRO (Megacity Initiative: Local And Global Research Observations) is an international collaborative project to examine the behavior and the export of atmospheric emissions from a megacity. The Mexico City Metropolitan Area (MCMA) – one of the world's largest megacities and North America's most populous city – was selected as the case study to characterize the sources, concentrations,... hiện toàn bộ
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