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Full-Text Articles in Medicine and Health Sciences
Sources Of Particulate Matter In The Northeastern United States In Summer: 2. Evolution Of Chemical And Microphysical Properties, C. A. Brock, A. P. Sullivan, Richard E. Peltier, R. J. Weber, A. Wollny, J. A. De Gouw, A. M. Middlebrook, E. L. Atlas, A. Stohl, M. K. Trainer, O. R. Cooper, F. C. Fehsenfeld, G. J. Frost, J. S. Holloway, G. Hübler, J. A. Neuman, T. B. Ryerson, C. Warneke, J. C. Wilson
Sources Of Particulate Matter In The Northeastern United States In Summer: 2. Evolution Of Chemical And Microphysical Properties, C. A. Brock, A. P. Sullivan, Richard E. Peltier, R. J. Weber, A. Wollny, J. A. De Gouw, A. M. Middlebrook, E. L. Atlas, A. Stohl, M. K. Trainer, O. R. Cooper, F. C. Fehsenfeld, G. J. Frost, J. S. Holloway, G. Hübler, J. A. Neuman, T. B. Ryerson, C. Warneke, J. C. Wilson
Richard E. Peltier
Measurements of aerosol particle size distributions and composition and of trace and reactive gas mixing ratios were made on the NOAA WP-3D aircraft downwind of mixed urban/industrial sources in the northeastern United States (U.S.). These measurements were made in noncloudy air during July and August 2004, under conditions where cloud processing was not likely to play an important role in oxidation chemistry. Under these conditions, particulate sulfate was found to be produced with an exponential time constant of 3.5 d from the gas-phase oxidation of SO2, which was ubiquitous but inhomogeneously distributed in the pollution plumes. When submicron particle mass …
On The Volatility And Production Mechanisms Of Newly Formed Nitrate And Water Soluble Organic Aerosol In Mexico City, C. J. Hennigan, A. P. Sullivan, C. I. Fountoukis, A. Nenes, A. Hecobian, O. Vargas, Richard E. Peltier, A. T. Case Hanks, L. G. Huey, B. L. Lefer
On The Volatility And Production Mechanisms Of Newly Formed Nitrate And Water Soluble Organic Aerosol In Mexico City, C. J. Hennigan, A. P. Sullivan, C. I. Fountoukis, A. Nenes, A. Hecobian, O. Vargas, Richard E. Peltier, A. T. Case Hanks, L. G. Huey, B. L. Lefer
Richard E. Peltier
Measurements of atmospheric gases and fine par- ticle chemistry were made in the Mexico City Metropolitan Area (MCMA) at a site ∼ 30 km down wind of the city cen- ter. Ammonium nitrate (NH 4 NO 3 ) dominated the inorganic aerosol fraction and showed a distinct diurnal signature char- acterized by rapid morning production and a rapid mid-day concentration decrease. Between the hours of 08:00–12:45, particulate water-soluble organic carbon (WSOC) concentra- tions increased and decreased in a manner consistent with that of NO − 3 , and the two were highly correlated ( R 2 =0.88) during this time. …
No Evidence For Acid-Catalyzed Secondary Organic Aerosol Formation In Power Plant Plumes Over Metropolitan Atlanta, Georgia, Richard E. Peltier, A. P. Sullivan, R. J. Weber, A. G. Wollny, J. S. Holloway, C. A. Brock, J. A. De Gouw, E. L. Atlas
No Evidence For Acid-Catalyzed Secondary Organic Aerosol Formation In Power Plant Plumes Over Metropolitan Atlanta, Georgia, Richard E. Peltier, A. P. Sullivan, R. J. Weber, A. G. Wollny, J. S. Holloway, C. A. Brock, J. A. De Gouw, E. L. Atlas
Richard E. Peltier
Aircraft-based measurements of the water-soluble fraction of fine PM organic carbon (WSOC) and inorganic salt composition in the Atlanta, GA region were conducted in the summer of 2004. Five notable plumes of SO2, apparently from coal-fired power plants, were intercepted, and had NH4 +/SO42 molar ratios ranging from approximately 0.8 to 1.4 compared to molar ratios near 2 outside of the plumes. Sulfate aerosol concentrations increased from a regional background of 5–8 mg m 3 to as high as 19.5 mg m 3 within these plumes. No increase in WSOC concentrations was observed in plumes compared to out-of plumes within …
Investigating The Sources And Atmospheric Processing Of Fine Particles From Asia And The Northwestern United States Measured During Intex B, Richard E. Peltier, A. H. Hecobian, R. J. Weber, A. Stohl, E. L. Atlas, D. D. Riemer, D. R. Blake, E. Apel, T. Campos, T. Karl
Investigating The Sources And Atmospheric Processing Of Fine Particles From Asia And The Northwestern United States Measured During Intex B, Richard E. Peltier, A. H. Hecobian, R. J. Weber, A. Stohl, E. L. Atlas, D. D. Riemer, D. R. Blake, E. Apel, T. Campos, T. Karl
Richard E. Peltier
During the National Aeronautics and Space Ad- ministration (NASA) Intercontinental Chemical Transport Experiment, Phase B (INTEX-B), in the spring of 2006, air- borne measurements were made in the United States Pacific Northwest of the major inorganic ions and the water-soluble organic carbon (WSOC) of submicron (PM 1 . 0 ) aerosol. An atmospheric trajectory (HYSPLIT) and a Lagrangian particle dispersion model (Flexpart) quantifying source contributions for carbon monoxide (CO) were used to segregate air masses into those of primarily Asian influence ( > 75% Asian CO) or North American influence ( > 75% North American CO). Of the measured compounds, fine particle …
Airborne Measurements Of Carbonaceous Aerosol Soluble In Water Over Northeastern United States: Method Development And An Investigation Into Water-Soluble Organic Carbon Sources, A. P. Sullivan, Richard E. Peltier, C. A. Brock, J. A. De Gouw, J. S. Holloway, C. Warneke, A. G. Wollny, R. J. Weber
Airborne Measurements Of Carbonaceous Aerosol Soluble In Water Over Northeastern United States: Method Development And An Investigation Into Water-Soluble Organic Carbon Sources, A. P. Sullivan, Richard E. Peltier, C. A. Brock, J. A. De Gouw, J. S. Holloway, C. Warneke, A. G. Wollny, R. J. Weber
Richard E. Peltier
A particle-into-liquid sampler (PILS) was coupled to a total organic carbon (TOC) analyzer for 3 s integrated measurements of water-soluble organic carbon (WSOC) in PM1 ambient particles. The components of the instrument are described in detail. The PILS-TOC was deployed on the NOAA WP-3D aircraft during the NEAQS/ITCT 2004 program to investigate WSOC sources over the northeastern United States and Canada. Two main sources were identified: biomass burning emissions from fires in Alaska and northwestern Canada and emissions emanating from urban centers. Biomass burning WSOC was correlated with carbon monoxide (CO) and acetonitrile (r2 > 0.88). These plumes were intercepted in …
Concentrations And Sources Of Organic Carbon Aerosols In The Free Troposphere Over North America, Colette L. Heald, Daniel J. Jacob, Solène Turquety, Rynda C. Hudman, Rodney J. Weber, Amy P. Sullivan, Richard E. Peltier, Eliot L. Atlas, Joost A. De Gouw, Carsten Warneke, John S. Holloway, J. Andrew Neuman, John H. Seinfeld, Frank M. Flocke
Concentrations And Sources Of Organic Carbon Aerosols In The Free Troposphere Over North America, Colette L. Heald, Daniel J. Jacob, Solène Turquety, Rynda C. Hudman, Rodney J. Weber, Amy P. Sullivan, Richard E. Peltier, Eliot L. Atlas, Joost A. De Gouw, Carsten Warneke, John S. Holloway, J. Andrew Neuman, John H. Seinfeld, Frank M. Flocke
Richard E. Peltier
Aircraft measurements of water-soluble organic carbon (WSOC) aerosol over NE North America during summer 2004 (ITCT-2K4) are simulated with a global chemical transport model (GEOS-Chem) to test our understanding of the sources of organic carbon (OC) aerosol in the free troposphere (FT). Elevated concentrations were observed in plumes from boreal fires in Alaska and Canada. WSOC aerosol concentrations outside of these plumes average 0.9 ± 0.9 mg C m 3 in the FT (2–6 km). The corresponding model value is 0.7 ± 0.6 mg C m 3, including 42% from biomass burning, 36% from biogenic secondary organic aerosol (SOA), and …
Single-Particle Mass Spectrometry Of Tropospheric Aerosol Particles, D. M. Murphy, D. J. Cziczo, K. D. Froyd, P. K. Hudson, B. M. Matthew, A. M. Middlebrook, Richard E. Peltier, A. Sullivan, D. S. Thomson, R. J. Weber
Single-Particle Mass Spectrometry Of Tropospheric Aerosol Particles, D. M. Murphy, D. J. Cziczo, K. D. Froyd, P. K. Hudson, B. M. Matthew, A. M. Middlebrook, Richard E. Peltier, A. Sullivan, D. S. Thomson, R. J. Weber
Richard E. Peltier
The Particle Analysis by Laser Mass Spectrometry (PALMS) instrument has measured the composition of single particles during a number of airborne and ground-based campaigns. In the regions studied, 30% to over 80% of the aerosol mass in the free troposphere was carbonaceous material. Most of this carbonaceous material was probably organic. Although there were variations in their amounts, over 90% of accumulation mode particles away from local sources were internal mixtures of sulfates and carbonaceous material. Within this internal mixing, there was variation in the pattern of carbonaceous peaks in the spectra, especially in peaks related to organic acids. Particles …