Book.
1953 - Gale Group | World Scholar Latin America
L. T. Molina, Mario J. Molina, F. S. Rowland,
... brominated methanes and ethanes of atmospheric interestLuisa T. Molina, Mario J. Molina, and F. S. RowlandCite this: J. Phys. Chem. ...
Tópico(s): Atmospheric Ozone and Climate
1982 - American Chemical Society | The Journal of Physical Chemistry
P B, T O, Mark Skipworth Consumer Affairs Correspondent, Anthony Burgess, Barbara Hall, R C, Richard Ellis, Jon Swain, Philip Norman, B S, Andrew Grice Political Correspondent, Duncan Fallowell, Mark Reason, J C, Jonathan Miller, Eric Dymock, Sam Wink, John Birt Deputy Director-General, Mrs Thatcher, Barbara Ellis, Fiona Walsh, Lesley White, Rebecca Hubbard, Susan d'Arcy, Norman MaCrae, J D, R M O, J W L, Bob Farley, Graham Rose, Roy Porter, Norman Howell, Nicolette Jones, A C-M, P M, C G T, Alistair Scott, Sally Payne, Amanda Mitchison, David Smith, David Hinchliffe MP, G R, P D, Sean Ryan Environment Correspondent, D E, Nick Pitt, Frederic Raphael, M F C, William, E. Jane Dickson, Carl Hindmarch, Frank Allaun Vice-president, B Mac A, Geordie Greig, Philip Hoare, D C, Susan Marling, Robert Sandall, D Je, Iain Johnstone, P O, P F, R P, C L B, Irwin Stelzer, W I R, Robert Hewison, Ivan Fallon, Deryk Brown, S S, I Hayes, Geordie Greig Arts Correspondent, Wendy Leigh, David Jenkins, D W S, D R, Emma Hope, Herman Serrano, Richard Dunn, Molly Ivins, G P, J H B, Winifred Floyd, Harvey Porlock, M S B, David Grubb Executive Director, Alasdair Reid, Hugh Canning, T Ra, Arabella Fitzmaurice, Peter Kemp, Alan Brownjohn, Carol Price, Robert Harris, Graham Masterion, D W J, Caroline Lees, Peter Millar, H L C, E V B, B R O, George Perry, Cynthia Rose, John Cassidy, M S S, R G C, L H, S W, Joe Klein, Harry Ritchie, Calvin Klein, J G D, N T, C B H, H S-W, Adrian Turner, Derek Humphry Executive Director, Bernard Cafferty, Paul Golding, Fiona Walsh Deputy City Editor, Kim Andreolli, W W, Stuart Wavell, K W, Brent Walker, Paul Donovan, E H C, Rex Lanham, MalColm Morley, Greg Dyke, Jeff Randall, P C G, James Bethell, R J, John Luke, David Hughes, Rog Hughes, Peter Plant, E N C, Fiona Armstrong, Garth Crooks, R I, Wendy, Ira Miller, Canon Peter Boyd, Shelly Robbins, Robert Scandall, J I D, S M, Helen Fielding, Peter Gartland, John Karter, Jean Paul Goude, J S, R E, Barbara Amiel, Malcolm Winton, Patrick Taylor-Martin, Craig Brown, Diana Wright, Keith Floyd, B N, S B, Stephen Jones, G P N, N H, Nicola Sweeting, Jane Brown, P Hs S, Richard Palmer, AMacF, A A H, Andrew Grice, Martin Searby, H K, Sir Alan Peacock, S A, D Co, Julian Broad, P G R, C D H, Rufues Olins, Bryan Appleyard, Andrew Lorenz Associate Business Editor, Andrew Hogg, J P S, F A, Steve Bright, Ian Glover-James, N S, P R, Richard Woods, Norman Stone, T T, Louise Branson, Peter Johnson, E D, M A S, Maurice Chittenden, Mitchell Symons, M A F, President Slabodum Milosevic, David Hughes Chief Political Correspondent, Aileen Ballantyne Medical Correspondent, Brian MacArthur, Mel Webb, Michael Jones Political Editor, Andrew Yates, David Hunn, James Blitz, Zinnia Shap, Kate Parker, Clare Medwin, D J Taylor, G N D, J B M, M E, Q, Godfrey Smith, M R, Professor Robert Service, J A, Andrew Alderson, F R, J E S, Matthew Campbell, Brian Glanville, Stan Levenson, John Carey, Chris Dighton, Oliver North, Tony Moss, I H, H C A, P O W, Andrew Lorenz, John Furbisher, David Wickers, M V, A H H, Paul Reed, P W, Marina Vaizey, Stella Wallinger, Chris Lightbown, Jeff Randall City Editor, Roy Isacovitz, Andrew Davidson, Margaret Park, Paula Reed, Hugh Pearman, C A C, T H, J G S, David Smith Economics Editor, Penny Perrick, J R, Tony Hetherington, S R M, D M S, D T, R D S, Joanna Simon, James Dalrymple, B D, V N, G H, Boris Schapiro, Trevor Phillips,
... Milstein Francois Mitterrand Issey Miyake Mobutu Sese Seko Mario Molina Piet Mondrian Jean Monnet Jacques Monod Marilyn Monroe ...
1991 - Gale Group | Sunday Times HA GDA
L. T. Molina, Mario J. Molina,
... RETURN TO ISSUEPREVArticleNEXTUltraviolet spectrum of hypochlorous acidLuisa T. Molina and Mario J. MolinaCite this: J. Phys. Chem. 1978, 82, ...
Tópico(s): Per- and polyfluoroalkyl substances research
1978 - American Chemical Society | The Journal of Physical Chemistry
Giles Smith, Andrew Robson, Barry J. Holmes, Janice Turner, Sandor Marai, Christina Hardyment, Mark Hall, Stella Shamoon, Robert Cole, Matthew Syed, Johnny Davis, Neelam Verjee, George Caulkin and Oliver Kay, Frances Gibb Legal Editor, Jane MacQuitty, Simon Barnes, Peter Lansley, Robert Thicknesse, Nils Ringdal and Richard Daly, Bruce McCall, Anita James, Paul Hoggart, Mark Souster, David Rhys Jones, Richard Hobson, Gene Simmons, Clare Lazaro, Jeany Devay, Bridget Jones, Mark Sutherland, Anthony Bolton, Hannah Betts, Philip Howard, Hilary Finch, Richard Beard, Carol Midgley, Christine Seib, Michael Binyon, Tom Bawden and Christine Seib, James Bone, Rachel Campbell-Johnston, David Stuart, Nic Hopkins, Dominic Wells, Clive Davis, Pat Llewellyn, Kate Reardon, Anne Gatti, Alfie Howard, Bem, Andy Brough, Carl Mortished, Caroline and Melodie, Jane Taylor-Hayhurst, Nigel Kendail, Roger Maynard, John Bungey, Kevin Eason, Geoff Brown, Philippe Naughton, Clare Stewart, Joe Joseph, Andrew Norfolk, W. H. R. Crawford, David Sharrock, Alastair Campbell, Antonia Senior, Mollie Jenkins, Mark Griffiths, Pat Gibson, Valerie Elliott Countryside Editor, David McVay, Armando Iannucci, Stephen McClarence, Beryl Bainbridge, Vinny Lee, John Clarke, Stephen Daiton, Christina McLellan, Valerie Elliott Countryside Editor and Philip Webster Political Editor, Katherine Swift, Anthony Browne, Dominic Walsh, Ruth Gledhill, Debra Craine, Mike Pattenden, Victoria Segal, Joe Morgan, Nicola Smith, Grainne Gilmore, Daniel Finkelstein, Dr Jane Collins, Dan Sabbagh, Jane Clarke, Jo Morris, Nick Robinson, Alan Hamilton, Robin Young, Mince Pies, Nick Wyke, Paul Shearer, Tina Gaudoin, David Hands, Adam LeBor, Charles Bremner, Ron Lewis, Helen Rumbelow, John Westerby and Matthew Pryor, Stefanie Marsh, Matt Dickinson Chief Football Correspondent, Tim Teeman, Toby Faber, Jim Rossignol, Derwent May, Kate Muir, Struan Hellier, Tom Chesshyre & Chloe Bryan-Brown, Ivan Hewett, Cecil Beaton, Aggie MacKenzie, Paula Hawkins, John Humphrys, David Rowan, Johny Wilkinson, Dan Silver, Felipe Fernandez-Armesto, Richard Cork, Oliver Kay, Jerome Burne, Ed Potton, Stephen Anderton, Nigel Williamson, Martin Johnson, Amber Cowan, Andrew Green, David Lister, Mark Atherton, Lisa Armstrong, John Westerby, Neil Harman, Rick Broadbent, Tom Baldwin, Chris Power, Dr Feelgood, Andrew Pierce and Daniel McGrory, Simon de Bruxelles, Migel Kendall, Mark Slater, Rob Wright, Geoffrey Dean, James Flint, Magnus Grimond, Sarah Turner, Rod Stanley, Neil Harman Tennis Correspondent, Paul Mumford, Alf Alderson, Lucia Adams, W M MacKay, Adam Sage, Adrian George, Raymond Keene, Irma Kurtz, Suzi Godson, Ray Main, Luna Rossa, Richard Brass, Nigel Thomas, Rebecca O'Connor, Gordon Ramsay, Sean MacAulay, Merry Herry, Sam Faulkner, Kaveh Solhekol, Thomas Hitzlsperger and Bruce Rioch, Xan Rice, Tamara Rojo, Jeremy Page, Tina Ogle, Lewis Smith, Jemma Chapman and Adam Sage, Cathy Harris, Patrick Hosking, Richard Owen, John Rushton, Alex Hawkes, Erica Wagner, Gareth Child, Peter Pahldes, Ryan Anson, Michael Bywater, Peter Dixon, Gabriel Rozenberg Economics Reporter, Nick Hasell, Grainne Gilmore and Guy Haydon, James Naughtie, Mrs D Land, David Hands Rugby Correspondent, Victoria O'brien, Julian Muscat, Ben Webster Transport Correspondent and Jan Raath, Paul Simons, Adam Fresco, Chris Condron, Fiona Sims, Michael Browen, Anne Ashworth, John Goodbody, Andrew Martin, Robert Crampton, Lake Coppea, Jane Shilling, Philip J Charles, Mel Webb, Jim Fisher, Roderick Strange, Matthew Parris, Graham Searjeant Financial Editor, George Caulkin, Caroline Merrell banking Correspondent, Robert Elegant, Jonathan Rendall, Russell Jenkins, John Lister-Kaye, Sam McKnight, Celia Dodd, John Angerson, Iain Finlayson, Sheila Keating, Rebecca Ley, Caitlin Moran, Ben MacIntyre, Helen Pridham, Richard Beeston, Alan J…, Ben Webster, Alison Gibson, Erin O'connor, Graham Searjeant, David Sinclair, John Naish, Annabelle Thorpe, Lewis Stuart, Kieran Falconer, Mark Henderson, Hattie Ellis, Michael Horsnell, David Henry, Chris Ayres, Lisa Verrico, Carl Mortished International Business Editor, Nigel Hawkes Health Editor, Sarah Butler, Luica Van Der Post, Benedict Nightingale, Oliver Kamm, Owen Siot Chief Sports Reporter, Darian Leader, Angus Batey, Jonathan Meades, Dr Thomas Stuttaford, Jill Crawshaw, Ben Hoyle, Tom Roundell, Russell Celyn Jones, Alyson Rudd, Paul Connolly, Sam Lister Health Correspondent and James Doran, Rosalind Miles, Tom Chesshyre, Fred Dellar, James Christopher, Abigail Rayner, Simon Crompton, Bridget Chapple and Joe Morgan, Alunmichael, Alan Lee Racing Correspondent, Alan Jackson, Owen Slot, Pat Gibson and Dileep Premachandran, Cath Urquhart Travel Editor, Sharon Krum, Jenny Davey, Edward Gorman Sailing Correspondent, Matim Aston, Daphne Lockyer, Peter Klinger, Patience Wheatcroft, Christopher Irvine, Joan Smith, Rick Lew, Michael Barnard, Chloe Bryan-Brown, W E Kerswell,
... 4'S New Lifestyle Gurus Almost Famous Alfred Molina is the forgotten star of Spider-Man 2, sayd Ed Potton Molina moments Film Reviews The Incredibles live up to ...
2004 - Gale Group | TDA
L. T. Molina, Mario J. Molina,
... dibromodifluoromethane in the 200-300-nm regionLuisa T. Molina and Mario J. MolinaCite this: J. Phys. Chem. 1983, 87, ...
Tópico(s): Spectroscopy and Laser Applications
1983 - American Chemical Society | The Journal of Physical Chemistry
P. M. Sheehy, Rainer Volkamer, L. T. Molina, Mario J. Molina,
Abstract. A box model using measurements from the Mexico City Metropolitan Area study in the spring of 2003 (MCMA-2003) is presented to study oxidative capacity (our ability to predict OH radicals) and ROx (ROx=OH+HO2+RO2+RO) radical cycling in a polluted (i.e., very high NOx=NO+NO2) atmosphere. Model simulations were performed using the Master Chemical Mechanism (MCMv3.1) constrained with 10 min averaged measurements of major radical sources (i.e., HCHO, HONO, O3, CHOCHO, etc.), radical sink precursors ( ...
Tópico(s): Air Quality and Health Impacts
2010 - Copernicus Publications | Atmospheric chemistry and physics
Rainer Volkamer, P. M. Sheehy, L. T. Molina, Mario J. Molina,
Abstract. A detailed analysis of OH, HO2 and RO2 radical sources is presented for the near field photochemical regime inside the Mexico City Metropolitan Area (MCMA). During spring of 2003 (MCMA-2003 field campaign) an extensive set of measurements was collected to quantify time-resolved ROx (sum of OH, HO2, RO2) radical production rates from day- and nighttime radical sources. The Master Chemical Mechanism (MCMv3.1) was constrained by measurements of (1) concentration time-profiles of photosensitive ...
Tópico(s): Air Quality and Health Impacts
2010 - Copernicus Publications | Atmospheric chemistry and physics
Ryan C. Moffet, B. de Foy, L. T. Molina, Mario J. Molina, K. A. Prather,
Abstract. Continuous ambient measurements with aerosol time-of-flight mass spectrometry (ATOFMS) were made in an industrial/residential section in the northern part of Mexico City as part of the Mexico City Metropolitan Area-2006 campaign (MCMA-2006). Results are presented for the period of 15–27 March 2006. The submicron size mode contained both fresh and aged biomass burning, aged organic carbon (OC) mixed with nitrate and sulfate, elemental carbon (EC), nitrogen-organic carbon, industrial metal, ...
Tópico(s): Atmospheric aerosols and clouds
2008 - Copernicus Publications | Atmospheric chemistry and physics
Erik Velasco, Brian Lamb, H. Westberg, E. Allwine, G. Sosa, J. L. Arriaga‐Colina, B. T. Jobson, M. Lizabeth Alexander, P. Prazeller, W. B. Knighton, T. Rogers, Michel Grutter, S. C. Herndon, C. E. Kolb, M. Zavala, B. de Foy, Rainer Volkamer, L. T. Molina, Mario J. Molina,
Abstract. A wide array of volatile organic compound (VOC) measurements was conducted in the Valley of Mexico during the MCMA-2002 and 2003 field campaigns. Study sites included locations in the urban core, in a heavily industrial area and at boundary sites in rural landscapes. In addition, a novel mobile-laboratory-based conditional sampling method was used to collect samples dominated by fresh on-road vehicle exhaust to identify those VOCs whose ambient concentrations were primarily due to vehicle ...
Tópico(s): Air Quality and Health Impacts
2007 - Copernicus Publications | Atmospheric chemistry and physics
E. J. Dunlea, S. C. Herndon, David D. Nelson, Rainer Volkamer, Federico San Martini, P. M. Sheehy, M. S. Zahniser, Joanne Shorter, J. Wormhoudt, Brian Lamb, E. Allwine, J. S. Gaffney, N. A. Marley, Michel Grutter, C. Márquez, S. Blanco, B. Cárdenas, Armando Retama, Carolina Villegas, C. E. Kolb, L. T. Molina, Mario J. Molina,
Abstract. Data from a recent field campaign in Mexico City are used to evaluate the performance of the EPA Federal Reference Method for monitoring the ambient concentrations of NO2. Measurements of NO2 from standard chemiluminescence monitors equipped with molybdenum oxide converters are compared with those from Tunable Infrared Laser Differential Absorption Spectroscopy (TILDAS) and Differential Optical Absorption Spectroscopy (DOAS) instruments. A significant interference in the chemiluminescence ...
Tópico(s): Atmospheric Ozone and Climate
2007 - Copernicus Publications | Atmospheric chemistry and physics
V. Faye McNeill, Franz M. Geiger, Thomas Loerting, Bernhardt L. Trout, L. T. Molina, Mario J. Molina,
Characterization of the interaction of hydrogen chloride (HCl) with polar stratospheric cloud (PSC) ice particles is essential to understanding the processes responsible for ozone depletion. The interaction of HCl with ice was studied using a coated-wall flow tube with chemical ionization mass spectrometry (CIMS) between 5x10(-8) and 10(-4) Torr HCl and between 186 and 223 K, including conditions recently shown to induce quasi-liquid layer (QLL) formation on single crystalline ice samples. Measurements ...
Tópico(s): Spacecraft and Cryogenic Technologies
2007 - American Chemical Society | The Journal of Physical Chemistry A
K. Džepina, Janet Arey, Linsey C. Marr, Douglas R. Worsnop, D. Salcedo, Qi Zhang, T. B. Onasch, L. T. Molina, Mario J. Molina, J. L. Jiménez,
We report the quantification of ambient particle-bound polycyclic aromatic hydrocarbons (PAHs) for the first time using a real-time aerosol mass spectrometer. These measurements were carried out during the Mexico City Metropolitan Area field study (MCMA-2003) that took place from March 29 to May 4, 2003. This was the first time that two different fast, real-time methods have been used to quantify PAHs alongside traditional filter-based measurements in an extended field campaign. This paper focuses ...
Tópico(s): Atmospheric chemistry and aerosols
2007 - Elsevier BV | International Journal of Mass Spectrometry
Tópico(s): Migration, Health, Geopolitics, Historical Geography
2006 - Pontifical Catholic University of Chile | EURE (Santiago)
B. de Foy, J.R. Varela, L. T. Molina, Mario J. Molina,
Abstract. Urban areas can be large emitters of air pollutants leading to negative health effects and environmental degradation. The rate of venting of these airsheds determines the pollutant loading for given emission levels, and also determines the regional impacts of the urban plume. Mexico City has approximately 20 million people living in a high altitude basin with air pollutant concentrations above the health limits most days of the year. A mesoscale meteorological model (MM5) and a particle ...
Tópico(s): Meteorological Phenomena and Simulations
2006 - Copernicus Publications | Atmospheric chemistry and physics
L. C. Marr, K. Džepina, J. L. Jiménez, Fabienne Reisen, Heidi L. Bethel, Janet Arey, J. S. Gaffney, N. A. Marley, L. T. Molina, Mario J. Molina,
Abstract. Understanding sources, concentrations, and transformations of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere is important because of their potent mutagenicity and carcinogenicity. The measurement of particle-bound PAHs by three different methods during the Mexico City Metropolitan Area field campaign in April 2003 presents a unique opportunity for characterization of these compounds and intercomparison of the methods. The three methods are (1) collection and analysis of bulk samples ...
Tópico(s): Toxic Organic Pollutants Impact
2006 - Copernicus Publications | Atmospheric chemistry and physics
Terry Shirley, W. H. Brune, Xinrong Ren, Jingqiu Mao, R. Lesher, B. Cárdenas, Rainer Volkamer, L. T. Molina, Mario J. Molina, Brian Lamb, Erik Velasco, B. T. Jobson, M. Alexander,
Abstract. The Mexico City Metropolitan Area (MCMA) study in April 2003 had measurements of many atmospheric constituents, including OH and HO2. It provided the first opportunity to examine atmospheric oxidation in a megacity in a developing country that has more pollution than typical U.S. and European cities. At midday, OH typically reached 0.35 pptv (~7×106 cm−3), comparable to amounts observed in U.S. cities, but HO2 reached 40 pptv, more than observed in most U.S. cities. The OH reactivity was ...
Tópico(s): Air Quality Monitoring and Forecasting
2006 - Copernicus Publications | Atmospheric chemistry and physics
José Agustín García-Reynoso, Rainer Volkamer, L. T. Molina, Mario J. Molina, J. Samuelson, J. Mellqvist, B. Galle, S. C. Herndon, C. E. Kolb,
Abstract. Photochemical pollution control strategies require an understanding of photochemical oxidation precursors, making it important to distinguish between primary and secondary sources of HCHO. Estimates for the relative strengths of primary and secondary sources of formaldehyde (HCHO) were obtained using a statistical regression analysis with time series data of carbon monoxide (CO) and glyoxal (CHOCHO) measured in the Mexico City Metropolitan Area (MCMA) during the spring of 2003. Differences ...
Tópico(s): Air Quality and Health Impacts
2006 - Copernicus Publications | Atmospheric chemistry and physics
B. de Foy, Alain Clappier, L. T. Molina, Mario J. Molina,
Abstract. Mexico City lies in a high altitude basin where air quality and pollutant fate is strongly influenced by local winds. The combination of high terrain with weak synoptic forcing leads to weak and variable winds with complex circulation patterns. A gap wind entering the basin in the afternoon leads to very different wind convergence lines over the city depending on the meteorological conditions. Surface and upper-air meteorological observations are analysed during the MCMA-2003 field campaign ...
Tópico(s): Climate variability and models
2006 - Copernicus Publications | Atmospheric chemistry and physics
T. Rogers, E. P. Grimsrud, S. C. Herndon, John T. Jayne, C. E. Kolb, E. Allwine, H. Westberg, Brian Lamb, M. Zavala, L. T. Molina, Mario J. Molina, W. B. Knighton,
A proton transfer reaction mass spectrometer (PTR-MS) was redesigned and deployed to monitor selected hydrocarbon emissions from in-use vehicles as part of the Mexico City Metropolitan Area (MCMA) 2003 field campaign. This modified PTR-MS instrument provides the necessary time response (<2 s total cycle time) and sensitivity to monitor the rapidly changing hydrocarbon concentrations, within intercepted dilute exhaust emission plumes. Selected hydrocarbons including methanol, acetaldehyde, acetone, methyl ...
Tópico(s): Air Quality and Health Impacts
2006 - Elsevier BV | International Journal of Mass Spectrometry
E. J. Dunlea, S. C. Herndon, David D. Nelson, Rainer Volkamer, Brian Lamb, E. Allwine, Michel Grutter, Carolina Villegas, C. Márquez, S. Blanco, B. Cárdenas, C. E. Kolb, L. T. Molina, Mario J. Molina,
Abstract. The performance of the EPA Federal Equivalent Method (FEM) technique for monitoring ambient concentrations of O3 via ultraviolet absorption (UV) has been evaluated using data from the Mexico City Metropolitan Area field campaign (MCMA-2003). Comparisons of UV O3 monitors with open path Differential Optical Absorption Spectroscopy (DOAS) and open path Fourier Transform Infrared (FTIR) spectroscopy instruments in two locations revealed average discrepancies in the measured concentrations between + ...
Tópico(s): Atmospheric Ozone and Climate
2006 - Copernicus Publications | Atmospheric chemistry and physics
B. de Foy, L. T. Molina, Mario J. Molina,
Abstract. Mesoscale meteorological modelling is an important tool to help understand air pollution and heat island effects in urban areas. Accurate wind simulations are difficult to obtain in areas of weak synoptic forcing. Local factors have a dominant role in the circulation and include land surface parameters and their interaction with the atmosphere. This paper examines an episode during the MCMA-2003 field campaign held in the Mexico City Metropolitan Area (MCMA) in April of 2003. Because the ...
Tópico(s): Climate variability and models
2006 - Copernicus Publications | Atmospheric chemistry and physics
Federico San Martini, E. J. Dunlea, Rainer Volkamer, T. B. Onasch, John T. Jayne, Manjula R. Canagaratna, Douglas R. Worsnop, C. E. Kolb, Joanne Shorter, S. C. Herndon, M. S. Zahniser, D. Salcedo, K. Džepina, J. L. Jiménez, José M. Ortega, K. S. Johnson, Gregory J. McRae, L. T. Molina, Mario J. Molina,
Abstract. A Markov Chain Monte Carlo model for integrating the observations of inorganic species with a thermodynamic equilibrium model was presented in Part I of this series. Using observations taken at three ground sites, i.e. a residential, industrial and rural site, during the MCMA-2003 campaign in Mexico City, the model is used to analyze the inorganic particle and ammonia data and to predict gas phase concentrations of nitric and hydrochloric acid. In general, the model is able to accurately ...
Tópico(s): Air Quality Monitoring and Forecasting
2006 - Copernicus Publications | Atmospheric chemistry and physics
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 (NR-PM1) with high time and size-resolution. In order to account for the refractory material in the aerosol, we also ...
Tópico(s): Atmospheric Ozone and Climate
2006 - Copernicus Publications | Atmospheric chemistry and physics
M. Zavala, S. C. Herndon, Robert Slott, E. J. Dunlea, Linsey C. Marr, Joanne Shorter, M. S. Zahniser, W. B. Knighton, T. Rogers, C. E. Kolb, L. T. Molina, Mario J. Molina,
Abstract. A mobile laboratory was used to measure on-road vehicle emission ratios during the MCMA-2003 field campaign held during the spring of 2003 in the Mexico City Metropolitan Area (MCMA). The measured emission ratios represent a sample of emissions of in-use vehicles under real world driving conditions for the MCMA. From the relative amounts of NOx and selected VOC's sampled, the results indicate that the technique is capable of differentiating among vehicle categories and fuel type in real ...
Tópico(s): Air Quality Monitoring and Forecasting
2006 - Copernicus Publications | Atmospheric chemistry and physics
Federico San Martini, E. J. Dunlea, Michel Grutter, T. B. Onasch, John T. Jayne, Manjula R. Canagaratna, Douglas R. Worsnop, C. E. Kolb, Joanne Shorter, S. C. Herndon, M. S. Zahniser, José M. Ortega, Gregory J. McRae, L. T. Molina, Mario J. Molina,
Abstract. The equilibrium inorganic aerosol model ISORROPIA was embedded in a Markov Chain Monte Carlo algorithm to develop a powerful tool to analyze aerosol data and predict gas phase concentrations where these are unavailable. The method directly incorporates measurement uncertainty, prior knowledge, and provides a formal framework to combine measurements of different quality. The method was applied to particle- and gas-phase precursor observations taken at La Merced during the Mexico City Metropolitan ...
Tópico(s): Air Quality and Health Impacts
2006 - Copernicus Publications | Atmospheric chemistry and physics
Sébastien Rauch, Bernhard Peucker‐Ehrenbrink, Luisa T. Molina, Mario J. Molina, Rafel Ramos, Harold F. Hemond,
Automobile exhaust catalysts using platinum group elements (PGE) have been mandatory on new cars in the Mexico City Metropolitan Area (MCMA) since 1991. Platinum, Pd, Rh, Ir, and Os concentrations and the isotopic composition of Os were determined in PM10 samples from the MCMA. Samples were prepared by isotope dilution NiS fire assay, and analysis was performed by magnetic sector ICP-MS using a single collector instrument for Pt, Pd, Rh, and Ir analysis and a multicollector instrument for Os analysis. ...
Tópico(s): Geochemistry and Geologic Mapping
2006 - American Chemical Society | Environmental Science & Technology
Minqiang Jiang, Linsey C. Marr, E. J. Dunlea, S. C. Herndon, John T. Jayne, C. E. Kolb, W. B. Knighton, T. Rogers, M. Zavala, L. T. Molina, Mario J. Molina,
Abstract. Black carbon (BC) and polycyclic aromatic hydrocarbons (PAHs) are of concern due to their effects on climate and health. The main goal of this research is to provide the first estimate of emissions of BC and particle-phase PAHs (PPAHs) from motor vehicles in Mexico City. The emissions of other pollutants including carbon monoxide (CO), oxides of nitrogen (NOx), volatile organic compounds (VOCs), and particulate matter of diameter 2.5 μm and less (PM2.5) are also estimated. As a part of the Mexico ...
Tópico(s): Atmospheric chemistry and aerosols
2005 - Copernicus Publications | Atmospheric chemistry and physics
B. de Foy, Ernesto Caetano, Víctor Magaña, A. Zitácuaro, B. Cárdenas, Armando Retama, Rogério Rodrigo Ramos, L. T. Molina, Mario J. Molina,
Abstract. MCMA-2003 was a major field campaign investigating the atmospheric chemistry of the Mexico City Metropolitan Area (MCMA) in April of 2003. This paper describes the wind circulation patterns during the campaign both within the Mexico City basin and on the regional scale. ''Time roses'' are introduced to concisely analyze the diurnal wind patterns. Three episode types were identified that explain the conditions encountered: ''O3-South'', ''Cold Surge'' and ''O3-North''. These can be diagnosed from ...
Tópico(s): Atmospheric and Environmental Gas Dynamics
2005 - Copernicus Publications | Atmospheric chemistry and physics
B. Zuberi, K. S. Johnson, Gretchen K. Aleks, L. T. Molina, Mario J. Molina, Alexander Laskin,
The global presence of soot has significant effects on regional and global climate, as well as human health. Influence of soot on radiation budget, rain formation and heterogeneous chemistry, and its residence time in the atmosphere are largely dependent on its ability to interact with water. While freshly emitted soot is extremely hydrophobic, oxidation during aging causes soot to become more hydrophilic. Laboratory studies demonstrate that aged soot attracts and retains water, and can be efficiently ...
Tópico(s): Atmospheric Ozone and Climate
2005 - American Geophysical Union | Geophysical Research Letters