A5017343422- Air Quality and Health Impacts
- Mercury impact and mitigation studies
- Atmospheric chemistry and aerosols
- Toxic Organic Pollutants Impact
- Vehicle emissions and performance
- Air Quality Monitoring and Forecasting
- Gas Dynamics and Kinetic Theory
- Atmospheric Ozone and Climate
- Heavy metals in environment
- Rocket and propulsion systems research
- Cyclone Separators and Fluid Dynamics
- Atmospheric and Environmental Gas Dynamics
- Laser-induced spectroscopy and plasma
- Particle Dynamics in Fluid Flows
- Catalytic Processes in Materials Science
- Advanced Combustion Engine Technologies
- Astro and Planetary Science
- Coagulation and Flocculation Studies
- Advanced Aircraft Design and Technologies
- Indoor Air Quality and Microbial Exposure
- Biodiesel Production and Applications
- Environmental Justice and Health Disparities
- Industrial Gas Emission Control
- Smart Materials for Construction
- Spacecraft and Cryogenic Technologies
Rice University
2011-2015
SC Johnson (United States)
2015
Carroll University
2014
University of Wisconsin–Madison
2006-2014
Wuhan University of Technology
2009
Missouri University of Science and Technology
2002-2004
Abstract. Atmospheric deposition of Hg(II) represents a major input mercury to surface environments. The phase (gas or particle) has important implications for deposition. We use long-term observations reactive gaseous (RGM, the component Hg(II)), particle-bound (PBM, particulate fine matter (PM2.5), and temperature (T) at five sites in North America derive an empirical gas-particle partitioning relationship log10(K−1) = (10±1)–(2500±300)/T where K (PBM/PM2.5)/RGM with PBM RGM common mixing...
ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTProgress on Understanding Atmospheric Mercury Hampered by Uncertain MeasurementsDaniel A. Jaffe*†‡, Seth Lyman§, Helen M. Amos∥, Mae S. Gustin⊥, Jiaoyan Huang⊥, Noelle E. Selin#, Leonard Levin∇, Arnout ter Schure○, Robert P. Mason◆, Talbot¶, Andrew Rutter∞, Brandon Finley†, Lyatt Jaeglé‡, Viral Shah‡, Crystal McClure‡, Jesse Ambrose†, Lynne Gratz†, Steven Lindberg$, Peter Weiss-Penzias⊗, Guey-Rong Sheu∀, Dara Feddersen⧓, Milena Horvat◘, Ashu...
Primary and secondary sources contributing to atmospheric organic aerosol during the months of July August were quantitatively assessed in three North American urban areas: Cleveland, Ohio, Detroit, Michigan, Midwest region Riverside, California, Los Angeles Air Basin. Organic molecular marker species unique primary tracers derived from isoprene, α-pinene, β-caryophyllene, toluene measured using gas chromatography−mass spectrometry. Source contributions motor vehicles, biomass burning,...
A laboratory system was developed to study the gas-particle partitioning of reactive mercury (RM) as a function aerosol composition in synthetic atmospheric particulate matter. The collection RM achieved by filter- and sorbent-based methods. Analyses collected on filters sorbents were performed using thermal extraction combined with cold vapor atomic fluorescence spectroscopy (CVAFS), allowing direct measurement load substrates. Laboratory measurements coefficients particles revealed strong...
Abstract. In order to expand the currently limited understanding of atmospheric mercury source-receptor relationships in Mexico City Metropolitan Area, real time measurements were made at a downtown urban site, and rural site on outskirts City, during March 2006. Numerous short-lived increases particulate (PHg) reactive gaseous (RGM) concentrations observed 17 day study, less frequent elemental (GEM) measured both sites. The episodic attributed plume impacts from industrial point source...
Concentrations of fine carbonaceous aerosols (PM2.5), including elemental carbon (EC), organic (OC), and water-soluble (WSOC) were measured from filters collected every 6th day for one year at three urban/industrial sites in the Midwestern United States: Cincinnati, Cleveland, Mingo Junction, Ohio. The fraction particulate OC varied considerably site to monthly averages between 39–85% 35–68% 32–65% Junction. Average concentrations WSOC compared with measurements source tracers, levoglucosan,...
Gaseous elemental mercury (GEM), particulate (PHg) and reactive gaseous (RGM) were measured every other hour at a rural location in south central Wisconsin (Devil's Lake State Park, WI, USA) between April 2003 March 2004, predominantly downwind urban site southeastern (Milwaukee, June 2004 May 2005. Annual averages of GEM, PHg, RGM the statistically higher than those site. Pollution roses GEM (RM; sum PHg RGM) sites revealed influences point source emissions surrounding counties that...
The use of a platinum−cerium bimetallic fuel additive has been proposed as cost-effective strategy for reducing particulate matter (PM) and NOx emissions from diesel-powered engines. Although previous studies have demonstrated that the reduced diesel engines, there no reported investigations how these fuel-borne catalysts (FBCs) impact chemical physical properties PM emissions. present study demonstrates significant on detailed composition size distribution emitted engine. Tests were...
Abstract. Atmospheric deposition represents a major input of mercury to surface environments. The phase (gas or particle) has important implications for its removal from the atmosphere. We use long-term observations reactive gaseous (RGM), particle-bound (PBM), fine particulate matter (PM2.5), and temperature at five sites in North America derive an empirical gas-particle partitioning relationship log10(K-1) = (10 ± 1) − (2500 300)/T where K (PBM/PM2.5)/RGM with PBM RGM common mixing ratio...
We present field observations made in June 2011 downwind of Dallas–Fort Worth, TX, and evaluate the role stabilized Criegee radicals (sCIs) gaseous sulfuric acid (H2SO4) production. Zero-dimensional model calculations show that sCI from biogenic volatile organic compounds composed majority sCIs. The main uncertainty associated with an evaluation H2SO4 production reaction channel is lack experimentally determined rates for sCIs formed isoprene ozonolysis SO2 along systematic discrepancies...
Abstract. Quantitative analysis of three atmospheric mercury species – gaseous elemental (Hg0), reactive (RGHg) and particulate (PHg) has been limited to date by lack ambient measurement data as well uncertainties in numerical models emission inventories. This study employs the Community Multiscale Air Quality Model version 4.6 with chemistry (CMAQ-Hg), examine how local emissions, meteorology, chemistry, deposition affect concentration Great Lakes Region (GLR), two sites Wisconsin...
Abstract Reactive gaseous mercury (RGM) and particulate (PHg) were collected in Milwaukee, WI, between April 2004 May 2005, Riverside, CA, July 25 August 7, 2005 using sorbent filter substrates. The substrates analyzed for by thermal desorption analysis (TDA) a purpose-built instrument. Results from this offline-TDA method compared with measurements real-time atmospheric analyzer. RGM made the agreed well commercial method. However, offline TDA reported PHg concentrations 2.7 times higher...
Northern cities in the Midwest experience frequent PM concentrations excess of Federal PM2.5 and PM10 National Ambient Air Quality Standards (NAAQS) during winter, which increasingly outnumber summertime excesses further north are located. In contrast, located south Great Lakes tended to a greater number summer. order ascertain key components contributing these winter exceedances, we examined regional elevated concentration episode occurred between January 31, 2005 February 6, 2005. The was...
The fate of oxidized mercury (Hg) in clouds and fogs is affected by the complexation Hg(II) with other chemical species present cloud fog water. Metal often influences types reactions available to a metal an aqueous system. influence pH, major inorganic ions, organic acids on methylmercury (MeHg) was examined for range water compositions. Fog collected San Joaquin Valley, CA rain at Devil's Lake State Park, WI provide additional measurements conditions atmospheric media. A thermodynamic...
Foliar accumulations of gaseous elemental mercury (GEM) were measured in three plant species between nominal temperatures 10 and 30 °C irradiances 0, 80, 170 W m−2 (300 nm−700 nm) a 19 m3 controlled environment chamber. The plants exposed as follows: White Ash (Fraxinus americana; WA); Spruce (Picea glauca; WS); Kentucky Bluegrass (Poa partensis; KYBG). enrichments the stable isotope (198Hg) used to measure accumulation. Exposures lasted for 1 day after which leaves digested hot acid...