个人简介

University of Maryland, College Park - B.S. in Chemical Engineering (1999) California Institute of Technology - M.S. in Environmental Science & Engineering (2003) California Institute of Technology - Ph.D. in Environmental Science & Engineering (2005) University of Colorado - CIRES & NOAA-ESRL, Research Scientist (2005-2012) University of Denver - Research Scientist (2012) Biography Selected Awards University of Colorado- CIRES Visiting Scholar Fellowship, June 2005-2007 University of Colorado- CIRES Outstanding Performance Award in Science and Engineering, 2011 CO-LABS Governor’s Award for High-Impact Research, 2012

研究领域

Environmental Chemistry

Our research projects are aimed at understanding processes that result in formation of atmospheric aerosol particles. Aerosol particles can deteriorate air quality, reduce visibility, affect cloud formation and lifetime, and change the radiation balance of the earth. These particles may be emitted directly into the atmosphere (“primary aerosol”, such as sea-salt, dust, and soot) or formed by secondary processes such as gas to particle conversion, heterogeneous reactions, or aqueous phase reactions (“secondary aerosol”, such as sulfate, nitrate, and organic particles). Depending on the ambient conditions (e.g., relative humidity) and types of precursors and oxidants available in an area, certain processes may be more important than others for secondary aerosol formation. Although details of such chemical transformations are not well understood yet, fundamentally it is established that size and chemical composition of aerosol particles determine their lifetime, health, and environmental impacts. Therefore, the key to a better understanding of aerosol formation processes and their regional and global impacts is to characterize their size and chemical composition in as much detail as possible. In our group, we measure composition and size of particles by different analytical techniques, such as mass spectrometry, gas chromatography/mass spectrometry, and differential mobility analysis. We also measure optical properties of the particles by cavity attenuated phase shift spectroscopy. During ambient field measurements and process-specific laboratory experiments, we combine our aerosol measurements with auxiliary gas phase measurements (e.g., nitrogen oxides and ozone) to assess the influence of different sources and chemical transformations on the microphysical, chemical, and optical properties of aerosol particles.

近期论文

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O'Dowd, C., J.L. Jimenez, R. Bahreini, R.C. Flagan, J.H. Seinfeld, K. Hameri, L. Pirjola, M. Kulmala, S.G. Jennings, T. Hoffmann, Marine aerosol formation from biogenic iodine emissions. Nature, 417: 632-636, 2002. Bahreini, R., J.L. Jimenez, J. Wang, J.T. Jayne, D.R. Worsnop, R.C. Flagan, J.H. Seinfeld, Aircraft-based aerosol size and composition measurements during ACE-Asia using an Aerodyne Aerosol Mass Spectrometer, J. Geophys. Res.- Atmospheres, 108, D23, 8645, doi:10.1029/2002JD003226, 2003. Bahreini, R., M.D. Keywood, N.L. Ng, V. Varutbangkul, S. Gao, R.C. Flagan, J.H. Seinfeld, D.R. Worsnop, Measurements of Secondary Organic Aerosol (SOA) from oxidation of cycloalkenes, terpenes, and m-xylene using the Aerodyne Aerosol Mass Spectrometer, Environ. Sci. Technol., 39 (15), 10.1021/es048061a, 2005. Bahreini, R., E.J. Dunlea, B.M. Matthew, C. Simons, K.S. Docherty, P.F. DeCarlo, J.L. Jimenez, C.A. Brock, A.M. Middlebrook, Design and Operation of a Pressure-controlled inlet for airborne sampling with an aerodynamic aerosol lens. Aerosol Sci. Technol., 42 (6), doi: 10.1080/02786820802178514, 2008. Warneke, C., R. Bahreini, J. Brioude, C. A. Brock, J. A. d. Gouw, D. W. Fahey, K. D. Froyd, J. S. Holloway, A. Middlebrook, L. Miller, S. Montzka, D. M. Murphy, J. Peischl, T. B. Ryerson, J. P. Schwarz, J. R. Spackman, and P. Veres, Biomass burning in Siberia and Kazakhstan as the main source for Arctic Haze over the Alaskan Arctic in April 2008. Geophys. Res. Lett., 36, doi:10.1029/2008GL036194, 2009 Bahreini, R., B. Ervens, A.M. Middlebrook, C. Warneke, J.A. de. Gouw, P.F. DeCarlo, J.L. Jimenez, C.A. Brock, J.A. Neuman, T.B. Ryerson, H. Stark , E. Atlas, J. Brioude, A. Fried, J.S. Holloway, J. Peischl, D. Richter, J. Walega, P. Weibring, A.G. Wollny, F.C. Fehsenfeld , Organic Aerosol Formation in Urban and Industrial Plumes near Houston and Dallas, TX. J. Geophys. Res.- Atmospheres, doi:101.1029/2008011493, 2009 Nowak, J.B., J.A. Neuman, R. Bahreini, C.A. Brock, A. M. Middlebrook, A. G. Wollny, J. S. Holloway, J. Peischl, T. B. Ryerson, and F. C. Fehsenfeld, Airborne observations of ammonia and ammonium nitrate formation over Houston, TX, J. Geophys, Res., 115, doi:10.1029/2010JD014195, 2010 de Gouw, J.A., A.M. Middlebrook, C. Warneke, R. Ahmadov, E.L. Atlas, R. Bahreini, D.R. Blake, C.A. Brock, J. Brioude, D.W. Fahey, F.C. Fehsenfeld, J.S. Holloway, M. Le Henaff, R.A. Lueb., S.A. McKeen, J.F. Meagher, D.M. Murphy, C. Paris, D.D. Parrish, A.E. Perring, I.B. Pollack, A.R. Ravishankara, A.L. Robinson, T.B. Ryerson, J.P. Schwarz. J.R. Spackman, A. Srinivasan, L.A. Watts, Organic Aerosol Formation Downwind from the Deepwater Horizon Oil Spill, Science, 331, 1295-1299, 2011 Middlebrook, A.M., R. Bahreini, J.L. Jimenez, M.R. Canagaratna, Evaluation of composition-dependent collection efficiencies for the Aerodyne Aerosol Mass Spectrometer using field data, Aerosol Sci. Technol., doi:10.1080/02786826.2011.620041, 2011 Lack, D.A., C.D. Cappa, J. Langridge, R. Bahreini. G. Buffaloe, C. Brock, et al., Impact of fuel quality regulation and speed reductions on shipping emissions: Implications for climate and air quality, Environ. Sci. Technol., doi: 10.1021/es2013424, 2011 Moore, R. H., K. Cerully, R. Bahreini, C. A. Brock, A. M. Middlebrook, and A. Nenes, Hygroscopicity and composition of California CCN during summer 2010, J. Geophys. Res- Atmosphere, doi:10.1029/2011JD017352, 2012 Bahreini, R., A.M. Middlebrook, J.A. de Gouw, C. Warneke, M. Trainer, C.A. Brock, H. Stark, S.S. Brown, W.P. Dube, J.B. Gilman, K. Hall, J.S. Holloway, W.C. Kuster, A.E. Perring, A.S.H. Prevot, J.P. Schwarz, J.R. Spackman, S. Szidat, N.L. Wagner, R.J. Weber, P. Zotter, D.D. Parrish, Gasoline emissions dominate over diesel in formation of secondary organic aerosol mass, Geophys. Res. Lett., doi:10.1029/2011GL050718, 2012. (Selected as "GRL Editor’s Highlight" and "EOS Research Highlight") Nowak, J.B., J. A. Neuman, R. Bahreini, A. M. Middlebrook, J. S. Holloway, S. A. McKeen, D. D. Parrish, T. B. Ryerson, M. Trainer, Ammonia sources in the California South Coast Air Basin and their impact on ammonium nitrate formation, Geophys. Res. Lett., doi:10.1029/2012GL051197, 2012. (Selected as "EOS Research Highlight") Bahreini, R., A.M. Middlebrook, C.A. Brock, J.A. de Gouw, S.A. McKeen, L.R. Williams, K.E. Daumit, A.T. Lambe, P. Massoli, M.R. Canagaratna, R. Ahmadov, A.J. Carrasquillo, E.S. Cross, B. Ervens, J.S. Holloway, J.F. Hunter, T.B. Onasch, I.B. Pollack, J.M. Roberts, T.B. Ryerson, C. Warneke, P. Davidovitz, D.R. Worsnop, J.H. Kroll, Mass Spectral Analysis of Organic Aerosol Formed Downwind of the Deepwater Horizon Oil Spill: Field Studies and Laboratory Confirmations, Environ. Sci. Technol., 46 (15), 10.1021/es301691k, 2012 Lack, D.A., J.M. Langridge, R. Bahreini, C.D. Cappa, A.M. Middlebrook, J.P. Schwarz, Brown carbon and internal mixing in biomass burning particles, Proc. Natl. Acad. Sci. USA, 109 (37), 10.1073/pnas.1206575109, 2012