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Transition Metal-Catalyzed Oxidation of Atmospheric Sulfur: Global Implications for the Sulfur Budget
(Wiley-Blackwell, 2009)
We use observations of the oxygen-17 excess \((Δ^{17}O)\) of sulfate in the Arctic to quantify the sulfate source from aqueous \(SO_2 (S(IV))\) oxidation by \(O_2\) catalyzed by transition metals. Due to the lack of ...
Transpacific Transport of Asian Anthropogenic Aerosols and its Impact on Surface Air Quality in the United States
(American Geophysical Union, 2006)
We use satellite (MODIS) observations of aerosol optical depths (AODs) over the North Pacific, together with surface aerosol measurements at a network of remote U.S. sites (IMPROVE), to improve understanding of the ...
Surface Ozone Background in the United States: Canadian and Mexican Pollution Influences
(Elsevier, 2009)
We use a global chemical transport model (GEOS-Chem) with 1° × 1° horizontal resolution to quantify the effects of anthropogenic emissions from Canada, Mexico, and outside North America on daily maximum 8-hour average ozone ...
Global Distribution of Solid and Aqueous Sulfate Aerosols: Effect of the Hysteresis of Particle Phase Transitions
(American Geophysical Union, 2008)
The partitioning between solid and aqueous phases of tropospheric sulfate-ammonium particles is simulated with a global 3-D chemical transport model (CTM). The simulation explicitly accounts for the hysteresis of particle ...
A Large Organic Aerosol Source in the Free Troposphere Missing from Current Models
(American Geophysical Union, 2005)
Aircraft measurements of organic carbon (OC) aerosol by two independent methods over the NW Pacific during the ACE-Asia campaign reveal unexpectedly high concentrations in the free troposphere (FT). Concentrations average ...
Sulfate Formation in Sea-Salt Aerosols: Constraints from Oxygen Isotopes
(American Geophysical Union, 2005)
We use observations of the mass-independent oxygen isotopic composition (Δ17O) of sulfate in the marine boundary layer (MBL) to quantify the sulfate source from aqueous SO2 (S(IV)) oxidation by O3 in alkaline sea-salt ...
Chemical Cycling and Deposition of Atmospheric Mercury: Global Constraints from Observations
(American Geophysical Union, 2007)
We use a global 3-D model of atmospheric mercury (GEOS-Chem) to interpret worldwide observations of total gaseous mercury (TGM) and reactive gaseous mercury (RGM) in terms of the constraints they provide on the chemical ...
Air-Sea Exchange in the Global Mercury Cycle
(American Geophysical Union, 2007)
We present results from a new global atmospheric mercury model coupled with a mixed layer slab ocean. The ocean model describes the interactions of the mixed layer with the atmosphere and deep ocean, as well as conversion ...
Fire and Biofuel Contributions to Annual Mean Aerosol Mass Concentrations in the United States
(Elsevier, 2007)
We estimate the contributions from biomass burning (summer wildfires, other fires, residential biofuel, and industrial biofuel) to seasonal and annual aerosol concentrations in the United States. Our approach is to use ...
Sources of carbonaceous aerosols over the United States and implications for natural visibility
(Wiley-Blackwell, 2003)
We use a global three-dimensional model (GEOS-CHEM) to better quantify the sources of elemental carbon (EC) and organic carbon (OC) aerosols in the United States through simulation of year-round observations for 1998 at a ...