Journal articleProceedings of the National Academy of Sciences of the United States of America · April 2012
Natural gas is seen by many as the future of American energy: a fuel that can provide energy independence and reduce greenhouse gas emissions in the process. However, there has also been confusion about the climate implications of increased use of natural ...
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Journal articleAdvances in Atmospheric Sciences · December 1, 2008
The authors present spatial and temporal characteristics of anthropogenic sulfate and carbonaceous aerosols over East Asia using a 3-D coupled regional climate-chemistry-aerosol model, and compare the simulation with the limited aerosol observations over t ...
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Journal articleJournal of the Air & Waste Management Association (1995) · October 2008
Isolating the effects of an individual emissions source on secondary air pollutants such as ozone and some components of particulate matter must incorporate complex nonlinear processes, be sensitive to small emissions perturbations, and account for impacts ...
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Journal articleAmerican Journal of Physics · July 1, 2008
A new undergraduate laboratory experiment demonstrates radiation laws and their applications to climatology and environmental science. The experiment emphasizes the planetary energy budget and effective-temperature concepts. A close look at "planets on the ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · June 2008
We estimated the global abundance of OH for the years 1988-1994 by interpreting observations of methyl chloroform (MCF) from two networks using an inverse technique and a 3-D chemical transport model driven by assimilated meteorology. Our inversion approac ...
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Journal articleATMOSPHERIC CHEMISTRY AND PHYSICS · 2008
Measurements of Volatile Organic Compounds (VOC) are analyzed to characterize the sources impacting the Hong Kong area. The ratios of different VOC species, m, p-xylenes-to-ethylbenzene, C6H14-to-toluene and p- xylene-to-total xylenes are used for diagnost ...
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Journal articleGlobal Biogeochemical Cycles · June 1, 2007
Primary productivity and the associated uptake of atmospheric carbon dioxide in the Southern Ocean (SO) is thought to be generally limited by bioavailable iron (Fe). Two sources of Fe for the surface waters of the SO have been proposed: (1) oceanic input o ...
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Journal articleJournal of Geophysical Research Atmospheres · February 16, 2007
A regional coupled climate-chemistry-aerosol model is developed. It is used to assess the direct and indirect effects of anthropogenic sulfate and carbonaceous aerosols on regional climate over east Asia with a focus on precipitation. The simulated direct ...
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Journal articleAtmospheric Chemistry and Physics · January 1, 2007
Data obtained in Hong Kong during the Hong Kong and the Pearl River Delta (PRD) Pilot Air Monitoring Study in autumn 2002 are analyzed to unravel the relationship between ground-level ozone (O3), pollution precursors, and cross-border transport. ...
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Journal articleAgricultural Systems · September 1, 2006
The attenuation of solar radiation by atmospheric aerosols simultaneously decreases the amount of radiation reaching the surface and increases the fraction of radiation which is diffuse. Decreasing the total amount of photosynthetically active radiation (P ...
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Journal articleProceedings of the National Academy of Sciences of the United States of America · March 21, 2006
A regional coupled climate-chemistry-aerosol model is developed to examine the impacts of anthropogenic aerosols on surface temperature and precipitation over East Asia. Besides their direct and indirect reduction of short-wave solar radiation, the increas ...
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Journal articleTellus Series B Chemical and Physical Meteorology · November 1, 2005
Previous studies suggest that the radiative effects of atmospheric aerosols (reducing total radiation while increasing the diffuse fraction) can enhance terrestrial productivity. Here, simulations using a regional climate/terrestrial biosphere model sugges ...
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Journal articleAtmospheric Environment · July 1, 2005
Observational surface ozone during a 16-month field experiment between 1999 and 2000 at six non-urban sites in the Yangtze Delta of China suggests that enhanced ozone concentrations were most prevalent during the spring, when the 90-day ozone-exposure indi ...
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Journal articleJournal of Geophysical Research D Atmospheres · February 16, 2005
For Fe contained in aeolian dust to act as a micronutrient for oceanic phytoplankton, some fraction of it must first be transformed (mobilized) into a form soluble in ocean water. Fe solubilization in deliquesced mineral dust aerosols emanating from East A ...
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Journal articleTheoretical and Applied Climatology · January 1, 2005
We replace the existing land surface parameterization scheme, the Biosphere-Atmosphere Transfer Scheme (BATS), in a regional climate model (RegCM) with the newly developed Common Land Model (CLM0). The main improvements of CLM0 include a detailed 10-layer ...
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Journal articleJournal of Geophysical Research Atmospheres · November 27, 2004
We evaluate the TRACE-P emission inventories for gaseous and particulate pollutants from East Asia using chemical measurements made at a rural site in China during the China-MAP Field Intensive in conjunction with a coupled regional climate/chemical transp ...
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Journal articleGeophysical Research Letters · November 1, 2003
For Fe contained in long-range transported acolian dust to act as a micronutrient for oceanic phytoplankton it must be first dissolved or mobilized. We propose that Femobilization can occur in mineral dust from East Asia by the incorporation of SO2
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Journal articleJournal of Geophysical Research: Atmospheres · April 16, 2003
This paper presents an overview of the 1999 Atlanta Supersite Project coordinated through the Southern Oxidants Study and Georgia Institute of Technology (GIT) and funded by the U.S. Environmental Protection Agency (EPA) along with other sponsors w ...
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Journal articleJournal of Geophysical Research Atmospheres · April 16, 2003
During the Atlanta Supersite Experiment (ASSE) in August 1999, a three-channel particle composition monitor (PCM) was used to measure PM2.5 mass and composition as well as gas-phase NH3, HCl, HNO3, HONO, SO2, and ...
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Journal articleJournal of Geophysical Research D Atmospheres · April 16, 2003
This paper presents an overview of the 1999 Atlanta Supersite Project coordinated through the Southern Oxidants Study and Georgia Institute of Technology (GIT) and funded by the U.S. Environmental Protection Agency (EPA) along with other sponsors who provi ...
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Journal articleJournal of Geophysical Research Atmospheres · April 16, 2003
Five new instruments for semicontinuous measurements of fine particle (PM2.5) nitrate and sulfate were deployed in the Atlanta Supersite Experiment during an intensive study in August 1999. The instruments measured bulk aerosol chemical composition at rate ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · December 2002
Data obtained during the 1999 Atlanta Supersite Experiment are used to test the validity of the assumption of thermodynamic equilibrium between fine particulate (PM2.5) nitrate (NO3-) and ammonium (NH4+) and gas-phase nitric acid (HNO3(g)) and ammonia (NH3 ...
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Journal articleAtmospheric Environment · October 1, 2002
Biogenic volatile organic carbon (VOC) emissions from vegetation in East Asia are estimated for two contrasting land-cover scenarios: near present-day conditions derived from satellite data and pre-disturbed land-cover based on climatological parameters an ...
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Journal articleJournal of Geophysical Research D: Atmospheres · May 27, 2002
We consider two independently derived data sets. The first represents the annually averaged distribution of anthropogenic aerosols over East Asia as derived by a coupled regional climate/chemical transport model. The other is the annually averaged distribu ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · May 2002
{[}1] We consider two independently derived data sets. The first represents the annually averaged distribution of anthropogenic aerosols over East Asia as derived by a coupled regional climate/chemical transport model. The other is the annually averaged di ...
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Journal articleJournal of Geophysical Research Atmospheres · January 1, 2002
We examine the budget and export of anthropogenic SOx (SO 2 and sulfate aerosol) emitted from East Asia during the late winter/early spring when continental outflow conditions dominate. Our study is based on simulations using a modifi ...
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Journal articleGlobal Biogeochemical Cycles · January 1, 2002
Scattering and absorption of sunlight by anthropogenic aerosols reduce the photosynthetically active radiation (PAR) incident upon the Earth's surface, but increase the fraction of the PAR that is diffuse. These alterations to irradiance may elicit conflic ...
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Journal articleJournal of Geophysical Research Atmospheres · January 1, 2002
We examine the budget and export of anthropogenic SOx (SO2 and sulfate aerosol) emitted from East Asia during the late winter/early spring when continental outflow conditions dominate. Our study is based on simulations using a modifie ...
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Journal articleGeophysical Research Letters · September 15, 2001
In this paper, a new mechanism is proposed by which aerosols decrease the amount of photosynthetically active radiation (PAR) available to plants for photosynthesis. The mechanism involves the scattering and absorption of PAR by water insoluble aerosol par ...
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Journal articleJournal of Geophysical Research Atmospheres · August 27, 2001
Beijing experiences air pollution such that the sky overhead is gray much of the time even on cloudless days. In order to understand the cause of this problem, the aerosol light scattering coefficient σsp and absorption coefficient σap
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Journal articleAtmospheric Environment · January 1, 2001
A total of 16 boundary layer (BL) DMS flux values were derived from flights over the Southern Ocean. DMS flux values were derived from airborne observations recorded during the Aerosol Characterization Experiment (ACE 1). The latitude range covered was 55° ...
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Journal articleTellus Series B Chemical and Physical Meteorology · January 1, 2001
We discuss a series of simulations of anthropogenic sulfur over East Asia with a SO2/SO2-4 chemistry-transport model driven in on-line mode by a regional climate model. Sensitivity to OH and H2O2 conce ...
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Journal articleGeophysical Research Letters · May 1, 2000
In this study, we report on the results from a comprehensive model simulation of regional ozone (O3) throughout a season in the eastern United States. The model is shown to perform better in terms of simulating seasonal, rather than episodic, ch ...
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Journal articleJournal of Geophysical Research Atmospheres · April 16, 2000
Shortly after 12 noon on August 15, 1995, the second highest 1-hour averaged O3 mixing ratio on record in Atlanta was observed at a monitoring site located to the west and generally upwind of the downtown core. Analysis of relevant data suggest ...
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Journal articleJournal of Geophysical Research Atmospheres · January 1, 2000
Air quality data gathered from five nonurban sites in China over a 12-month period from August 1994 to August 1995, along with meteorological observations from the same region and period, are used to identify and characterize a nonurban ozone (O3
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Journal articleAtmospheric Environment · January 1, 2000
The observation-based model - a diagnostic model designed to estimate ozone sensitivity to changes in the concentration of volatile organic compounds, nitrogen oxides, and CO - was used to analyze data gathered during the summer of 1995 at three photochemi ...
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Journal articleProceedings of the National Academy of Sciences of the United States of America · November 1999
The effect of atmospheric aerosols and regional haze from air pollution on the yields of rice and winter wheat grown in China is assessed. The assessment is based on estimates of aerosol optical depths over China, the effect of these optical depths on the ...
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Journal articleGeophysical Research Letters · April 1, 1999
Newly available data from non-urban locations in China along with regional model simulations suggest that ground-level ozone may be sufficiently high to affect China's winter wheat production. As non-urban ozone increases with industrialization, its effect ...
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Journal articleAtmospheric Environment · March 1, 1999
Urban Airshed Model-Version IV (UAM-IV) simulations on 7-8 July, 1988 for the Atlanta, Georgia, nonattainment area are used to investigate how recent changes in the National Ambient Air Quality Standard (NAAQS) and changes in boundary concentrations may af ...
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Journal articleJournal of Geophysical Research Atmospheres · November 20, 1998
An urban plume model is used to simulate the photochemistry of ozone (O3) precursors and the concomitant generation of O3 within an urban plume as it advects and mixes with the background atmosphere. On the basis of these calculations ...
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Journal articleJournal of Geophysical Research Atmospheres · September 20, 1998
This study examines the relationships between regional ozone (O3) pollution and emissions of nitrogen oxides (NOx) in the eastern United States during summer. Using measurements from rural sites during the summer of 1995, three 4-day ...
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Journal articleJournal of Geophysical Research Atmospheres · September 20, 1998
Using data collected on July 11, 1995, from the Tennessee Valley Authority (TVA) instrumented Bell 205 helicopter during the 1995 SOS Nashville/Middle Tennessee Ozone Study, we examine the relative roles of NOx and volatile organic compound (VOC ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · May 1998
We have used two different sets of assimilated input wind fields (United Kingdom Meteorological Office (UKMO), NASA) to drive the transport in a three-dimensional global chemical transport model. In a first experiment the distribution of carbon 14 after nu ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · May 1998
A numerical box model of the time evolution of key gaseous and aerosol species in an expanding plume of a subsonic aircraft is developed to investigate the effects of aircraft emissions on the characteristics of contrails. The model simulates the formation ...
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Journal articleJournal of Geophysical Research Atmospheres · January 1, 1998
We have used two different sets of assimilated input wind fields (United Kingdom Meteorological Office (UKMO), NASA) to drive the transport in a three-dimensional global chemical transport model. In a first experiment the distribution of carbon 14 after nu ...
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Journal articleJournal of Geophysical Research Atmospheres · January 1, 1998
A numerical box model of the time evolution of key gaseous and aerosol species in an expanding plume of a subsonic aircraft is developed to investigate the effects of aircraft emissions on the characteristics of contrails. The model simulates the formation ...
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Journal articleJournal of Geophysical Research Atmospheres · January 1, 1998
The U.S. Environmental Protection Agency (EPA) has recently promulgated new National Ambient Air Quality Standards (NAAQS) for ozone (O3). The new standard is based on an 8-hour average O3 concentration instead of a 1-hour average, as ...
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Journal articleJournal of Geophysical Research D: Atmospheres · 1998
We have used two different sets of assimilated input wind fields (United Kingdom Meteorological Office (UKMO), NASA) to drive the transport in a three-dimensional global chemical transport model. In a first experiment the distribution of carbon 14 after nu ...
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Journal articleJournal of Geophysical Research D: Atmospheres · 1998
A numerical box model of the time evolution of key gaseous and aerosol species in an expanding plume of a subsonic aircraft is developed to investigate the effects of aircraft emissions on the characteristics of contrails. The model simulates the formation ...
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Journal articleJournal of Geophysical Research Atmospheres · December 20, 1997
Aircraft observations during the Pacific Exploratory Mission in the western Pacific Ocean, phase B (PEM-West B), taken in February-March 1994, have been used to constrain a numerical model that calculates local concentrations of gaseous H2S0
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Journal articleBiogeochemical Cycles A Computer Interactive Study of Earth System Science and Global Change · December 1, 1997
The basic framework for investigating global change and its implcations for life on earth are presented. The first three chapters introduce and review the fundamentals: basic chemical concepts, relevant features of the earth system and the key physical, bi ...
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Journal articleEnvironmental Science and Technology · October 1, 1997
This work compares the relative frequencies of and meteorological conditions most conducive to exceedences of the current 1-h/120-ppbv national ambient air quality standard for ozone and the proposed revised standard based on daily maximum 8-h averages. Ch ...
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Journal articleJournal of Geophysical Research Atmospheres · September 20, 1997
A numerical model of the time evolution of subsonic aircraft exhaust is used to evaluate the possible activation of soot particles by collisions with SO2 and H2SO4 gas molecules and Brownian coagulation with H2SO ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · September 1997
A numerical model of the time evolution of subsonic aircraft exhaust is used to evaluate the possible activation of soot particles by collisions with SO2 and H2SO4 gas molecules and Brownian coagulation with H2SO4/H2O aerosol formed by homogeneous nucleati ...
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Journal articleJournal of Geophysical Research Atmospheres · February 20, 1997
A global three-dimensional chemical transport model is used to investigate seasonal variations of anthropogenic sulfur in the troposphere. Particular emphasis is placed on detailed comparisons of the modeled surface sulfur dioxide (SQ2) and sulf ...
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Journal articleChemosphere · February 1, 1997
Ambient concentrations of NO and NO(y) as well as O3 and CO were measured dining August 19 to September 1, 1991 in downtown Raleigh, North Carolina as apart of the Southern Oxidants Study-Southern Oxidants Research Program on Ozone Non-Attainmen ...
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Journal articleGeophysical Research Letters · January 1, 1997
A regional air quality model is used to assess the impact of inert organic nitrate formation on ground-level ozone in the eastern United States during summer. The chemical mechanism used is the Carbon Bond Mechanism 4 (CBM4), which is widely used by regula ...
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Journal articleGeophysical Research Letters · January 1, 1997
Within a conceptual framework of stratospheric injection, CO-CH4 background tropospheric chemistry, parameterized pollution production in the continental boundary layer and surface deposition, we use an 11 level GCTM to simulate global distribut ...
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Journal articleJournal of Geophysical Research: Atmospheres · 1997
A numerical model of the time evolution of subsonic aircraft exhaust is used to evaluate the possible activation of soot particles by collisions with SO2 and H2SO4 gas molecules and Brownian coagulation with H2SO4/H2O aerosol formed by homogeneous nucleati ...
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Journal articleJournal of Geophysical Research Atmospheres · December 20, 1996
A global chemical transport model is used to study the three-dimensional structure of the tropospheric ozone (O3) distribution over the North Atlantic Ocean during summer. A simplified representation of summertime O3 photochemistry ap ...
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Journal articleJournal of Geophysical Research Atmospheres · January 1, 1996
This study examines the influence of photochemical processes on ozone distributions in the western North Pacific. The analysis is based on data generated during NASA's western Pacific Exploratory Mission (PEM-West A) during the fall of 1991. Ozone trends w ...
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Journal articleJournal of the Air & Waste Management Association (1995) · March 1995
An Observation-Based Model (OBM) is described, which uses in-situ atmospheric observations to determine the sensitivity of ozone concentrations in an urban atmosphere to changes in the emissions of ozone precursors (i.e., volatile organic compounds and nit ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · January 1995
A study of the tropospheric and stratospheric cycles of phosgene is carried out to determine its fate and ultimate role in controlling the ozone depletion potentials of its parent compounds (CCl4, C2Cl4, CH3CCl3, CHCl3, and C2HCl3). Tropospheric phosgene i ...
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Journal articlePreparing for Global Change A Midwestern Perspective Proc Symposium Iowa City 1994 · January 1, 1995
We use the Geophysical Fluid Dynamics Laboratory (GFDL) Global Chemical Transport Model, with the six known sources for tropospheric NOx and off-line calculations of daytime gas-phase nitrogen photochemistry and night-time heterogeneous chemistr ...
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Journal articleJournal of Geophysical Research · 1995
A study of the tropospheric and stratospheric cycles of phosgene is carried out to determine its fate and ultimate role in controlling the ozone depletion potentials of its parent compounds (CCl4, C2Cl4, CH3CCl3, CHCl3, and C2HCl3). Tropospheric phosgene i ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · August 1994
An analysis is presented of vertical profiles of isoprene concentration and meteorological parameters measured in the boundary layer (BL) during the daylight hours at a rural site in Alabama and an urban site in Atlanta, Georgia, during the summer of 1990, ...
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Journal articleScience (New York, N.Y.) · April 1994
Three regions of the northern mid-latitudes, the continental-scale metro-agro-plexes, presently dominate global industrial and agricultural productivity. Although these regions cover only 23 percent of the Earth's continents, they account for most of the w ...
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Journal articleJournal of Geophysical Research · 1994
Of the 37 isoprene profiles recorded at the sites, 16 exhibited complex vertical structure with local maxima within the BL. This complex vertical structure appears to arise from a variety of turbulent processes fostered by horizontal inhomogeneities in the ...
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Journal articleJournal of Geophysical Research: Atmospheres · December 20, 1993
The Chemical Instrumentation Test and Evaluation 3 (CITE 3) NO‐NO2 database has provided a unique opportunity to examine important aspects of tropospheric photochemistry as related to the rapid cycling between NO and NO
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Journal articleGeophysical Research Letters · January 1, 1993
An alternate pathway for generating cloud condensation nuclei (CCN) in the remote marine boundary layer (MBL) from the oxidation of biogenically‐derived dimethyl sulfide (DMS) is proposed. This pathway invokes the production of H2SO4 ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · December 1992
The aqueous-phase chemistry of deliquescent sea-salt aerosols in the remote marine boundary layer is investigated with a steady state box model. The model simulates the scavenging of soluble and reactive gaseous species by the sea-salt aerosols, the chemic ...
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Journal articleJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · November 1992
A theoretical study is presented of the mechanisms by which freshly nucleated sulfuric acid particles can be grown to the size of cloud condensation nuclei (CCN) in remote marine areas. Three mechanisms are considered: (1) growth by the scavenging and subs ...
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Journal articleBERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS · March 1992
The aqueous-phase chemistry of deliquescent seasalt aerosols in the remote marine boundary layer is investigated with a steady-state box model. The model simulates the scavenging of soluble and reactive gaseous species by the seasalt aerosols, the chemical ...
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Journal articleJournal of Geophysical Research · January 1, 1992
While a large gradient is found among remote, rural, and urban/suburban nitrogen oxide concentrations, the total hydrocarbon reactivity in all continental locations is found to be comparable. Apportionment of the observed hydrocarbon species to mobile and ...
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Journal articleJournal of Geophysical Research · 1992
The model simulates the scavenging of soluble and reactive gaseous species by the sea-salt aerosols, the chemical reactions of these species and sea-salt ions in the deliquescent solution, and changes in the aerosol composition that occur as a result of th ...
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Journal articleJournal of Geophysical Research · 1992
Three mechanisms are considered: 1) growth by the scavenging and subsequent aqueous phase oxidation of atmospheric SO2, 2) growth by coagulation, and 3) growth by scavenging of atmospheric sulfuric acid. The first two mechanisms are too slow to represent a ...
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Journal articleHOSPITAL FORMULARY · August 1991
Recent interest in serotonin's role in the etiology of mood disorders has focused attention on antidepressant drugs that have a specific effect on this neurotransmitter. Fluvoxamine is a very potent and specific inhibitor of the presynaptic reuptake of ser ...
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Journal articleJournal of Atmospheric Chemistry · August 1, 1991
A one-dimensional, time-dependent model of the physics and chemistry of a warm stratiform cloud is used to study the possible impact of chemical inhomogeneity among cloud and raindrops on the oxidation of SO2 in clouds. The effects of chemical i ...
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Journal articleJournal of Geophysical Research · January 1, 1991
We conclude that the stratospheric source is too small to account for background surface NOy concentrations observed in the remote (i.e., regions a few thousand kilometers from continental source regions) troposphere. Surface NOy mixi ...
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Journal articleJournal of Geophysical Research · 1991
We conclude that the stratospheric source is too small to account for background surface NOy concentrations observed in the remote (i.e., regions a few thousand kilometers from continental source regions) troposphere. Surface NOy mixing ratios seldom excee ...
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Journal articleJournal of Atmospheric Chemistry · 1990
Vertical distributions of dimethylsulfide (DMS), sulfur dioxide (SO2), aerosol methanesulfonate (MSA), non-sea-salt sulfate (nss-SO2-4), and other aerosol ions were measured in maritime air west of Tasmania (Australia) during December 1986. A few cloudwate ...
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Journal articleJournal of Atmospheric Chemistry · January 1, 1990
A one-dimensional, time-dependent cloud model with parameterized microphysics is used to investigate the processes which control the rainout and washout of soluble gases from warm, precipitating stratiform clouds. Calculations are presented simulating the ...
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Journal articleJournal of Geophysical Research · 1990
Air quality data from Atlanta suggest that urban ozone concentrations are enhanced by increases in ambient temperature. Model calculations suggest that this enhancement is caused by the effect of temperature on the atmospheric chemistry of peroxyacetyl nit ...
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Journal articleJournal of Geophysical Research · 1990
Our analysis focussed on 2 sets of NO2/NO ratios derived from the data; these were based on overlapping NO and NO2 measurements made by 2 independent techniques; ie a chemiluminescent technique and a technique based on two-photon, laser-induced-fluorescenc ...
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Journal articleJournal of Geophysical Research · January 1, 1989
Simultaneous, high-resolution measurements of O3, NO, CO, dew point temperature, and UV flux obtained during the NASA Global Tropospheric Experiment Chemical Instrumentation Test and Evaluation (GTE/CITE 1) spring 1984 airborne field exercise ov ...
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Journal articleEnvironmental Science and Technology · January 1, 1989
A mathematical formulation is derived that describes the transport and chemistry of atmospheric gases as they diffuse through the open stomata, inner air spaces, and cell walls of plant leaves before depositing on the mesophyllic plasmalemma. The formulati ...
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Journal articleJAPCA · January 1989
Nine years of summertime ozone data from the Atlanta metropolitan area are analyzed and compared to local emissions of volatile organic carbon and nitrogen oxides. Trends from 1979 to 1987 were studied for the number of days per year ozone exceeded the NAA ...
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Journal articleScience (New York, N.Y.) · September 1988
The effects of natural hydrocarbons must be considered in order to develop a reliable plan for reducing ozone in the urban atmosphere. Trees can emit significant quantities of hydrocarbons to metropolitan areas such as Atlanta, and model calculations indic ...
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Journal articleJournal of Physical Chemistry · January 1, 1988
Independent measurements of the absorption cross section of the IO radical for the A2Π-X2Π band system are reported. A value of (3.1 ± 0.6) × 10-17 cm2 was observed for the (4,0) bandhead in good agreement with a ...
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Journal articleJournal of Geophysical Research · January 1, 1987
Simultaneous measurements of O3, NO, CO, H2O vapor, and temperature over the eastern and central North Pacific Ocean are analyzed to infer the role of photochemistry in the budget of tropospheric ozone. A statistical analysis of the d ...
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Journal articleStudies in Environmental Science · December 1, 1986
In the presence of sunlight, reduced species emitted into the atmosphere from the earth's surface are oxidized, converted to soluble forms, and then returned to the biosphere-lithosphere-hydrosphere. The free radical OH, predicted to be present in the atmo ...
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Journal articleTellus B · January 1, 1986
A one‐dimensional, time‐dependent model has been developed to study the removal of soluble gases from a warm, precipitating stratiform cloud. The model calculates the distributions of water vapor and condensed water, in the form of cloud drops and raindrop ...
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Journal articleTellus Series B · January 1, 1986
A one-dimensional, time-dependent model has been developed to study the removal of soluble gases from a warm, precipitating stratiform cloud. The model calculates the distributions of water vapor and condensed water, in the form of cloud drops and raindrop ...
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Journal articleJournal of Geophical Research · January 1, 1985
Photochemical models of topospheric trace species typically simulate the effects of wet removal of soluble species from the atmosphere through a first-order rainout parameterization, which is independent of the species solubility and constant in time. In t ...
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Journal article · July 1, 1984
The role of heterogeneous reactions and processes in the troposphere has been critically assessed by a group of 30 experts from government, universities, and industry. The results of this assessment, including identification and prioritization of a number ...
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Journal articleJournal of Geophysical Research · January 1, 1984
The coupled gas- and aqueous-phase photochemistry of a stratiform cloud in a remote region of the marine atmosphere is investigated with a time-dependent box model. Both scavenging of ambient acidic aerosols and gases as well as aqueous-phase chemical reac ...
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Journal articleReviews of Geophysics · January 1, 1984
The global rate of production of atmospheric NO is given by the product of the lightning energy dissipation rate and the NO yield per joule of discharge. A value for the global average energy dissipation rate is derived from the energy per flash and the gl ...
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Journal articleNature · December 1, 1983
The concern over the environmental effects of acidic rain has increased the interest in understanding the processes which control the acidity of cloud and rainwater1-6. In regions affected by anthropogenic emissions, H 2SO4 ...
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Journal articleJournal of Geophysical Research · January 1, 1982
The data suggest that a substantial fraction of the H2O2 found in precipitation is generated by aqueous-phase reactions within the cloudwater rather than via rainout and washout of gaseous H2O2. -from Authors ...
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Journal articleJournal of Geophysical Research · 1982
The data suggest that a substantial fraction of the H2O2 found in precipitation is generated by aqueous-phase reactions within the cloudwater rather than via rainout and washout of gaseous H2O2. -from Authors ...
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Journal articleJournal of Geophysical Research · January 1, 1982
Calculations are presented that simulate the free radical chemistries of the gas phase and aqueous phase within a warm cloud during midday. It is demonstrated that in the presence of midday solar fluxes the heterogeneous scavenging of OH and HO2 ...
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Journal articleOrigins of life · December 1981
A thermochemical-hydrodynamic model of the production of trace species by electrical discharges has been used to estimate the rates of fixation of C and N by lightning in the primitive atmosphere. Calculations for various possible mixtures of CH4, CO2, CO, ...
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Journal articleNASA Reference Publication · April 1, 1981
This report presents the scientific rationale and research activities recommended for NASA by the NASA Working Group on Tropospheric Program Planning established in 1978. The report identifies the major scientific question in tropospheric pollution, points ...
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Journal articleNASA Reference Publication · April 1, 1981
This report presents the scientific rationale and research activities recommended for NASA by the NASA Working Group on Tropospheric Program Planning established in 1978. The report identifies the major scientific question in tropospheric pollution, points ...
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Journal articleNASA Reference Publication · January 1, 1981
This report presents the scientific rationale and research activities recommended for NASA by the NASA Working Group on Tropospheric Program Planning established in 1978. The report identifies the major scientific question in tropospheric pollution, points ...
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Journal articleJournal of Geophysical Research · January 1, 1981
Tropospheric OH is believed to play a major role in atmospheric photochemistry, and, via its chemical interactions, OH ultimately may affect the climate, stratospheric ozone levels, and the pH of rain. Uncertainties in parameters imply over a factor of 3 v ...
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Journal articleNature · December 1, 1979
ATMOSPHERIC nitrogen oxides are a central issue in the photochemistry of the troposphere, stratosphere and urban atmosphere. The removal of nitrogen oxides by precipitation is a source of fixed nitrogen to the biosphere. Thus the nitrogen fixation rate by ...
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Journal articleNature · December 1, 1979
THE importance of lightning as a source of trace gases in the Earth's atmosphere has long been recognised. In 1827, von Liebig proposed lightning as a source of atmospheric fixed nitrogen1 and recent investigations have supported this hypothesis ...
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Journal articleGeophysical Research Letters · January 1, 1979
A new experimental technique measures j(O3‐O(¹D))the rate of solar photolysis of ozone to singlet oxygen atoms: O3 + hν → O2 + O(¹D). A flow actinometer carries dilute O3 in N2O into direct sunlight wh ...
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Journal articleJournal of the Atmospheric Sciences · January 1, 1979
Calculations of longwave, atmospheric heating and cooling rates using the rate equations of Rodgers and Walshaw (1966) with the Malkmus (1967) random band model are presented. A perturbation scheme is developed for the inclusion of aerosol scattering effec ...
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Journal articleJ Geophys Res · January 1, 1978
The photochemistry of several unreactive and moderately reactive nonmethane hydrocarbons (NMHC) in the background troposphere and stratosphere was investigated. A one-dimensional steady state model was employed to determine the vertical distributions of C/ ...
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Journal articleJ Geophys Res · January 1, 1977
The budget of tropospheric ozone is reexamined in the light of lower observed nitrogen oxide densities and revised reaction rates. To estimate the relative importance of transport and photochemistry, model calculations are presented which determine one-dim ...
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Journal articleJ Geophys Res · January 1, 1977
A model coupling photochemistry and vertical transport in the troposphere has been used to investigate the magnitude of possible future perturbations to atmospheric CH//4. The response of atmospheric CH//4 to an increase in the concentration of CO or to a ...
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Journal articleJournal of the Air Pollution Control Association · January 1, 1977
Improvements made on the direct NO2 photolysis actinometer developed by J. O. Jackson have produced more precise data. A plot of measured values of the photolysis rate J1 vs Eppley uv photometer readings produces a curved rather than ...
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Journal articleJournal of Geophysical Research · January 1, 1976
Results are described of a self consistent one dimensional coupled flow calculation for O(x), NO(x), HO(x), ClX, H2O, H2, CH4, H2O2, and N2O densities between 10 and 120 km. The results agre ...
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Journal articleJ Geophys Res · January 1, 1976
The daytime electron temperature profile of the Jovian ionosphere was calculated, taking into account the effects of thermal conduction and heat inflow from the plasmasphere. The photoelectron fluxes and electron heating rates were determined by using a tw ...
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Journal articleScience · January 1, 1975
The existence of tropospheric stratospheric feedback mechanisms affecting variations in stratospheric ozone indicates the need to model the complete tropospheric stratospheric system. For instance, a decrease in stratospheric ozone results in increased pho ...
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Journal articleGeophysical Research Letters · January 1, 1975
A comparison is made between two independent measurements and calculated values of j (NO2), the photolysis frequency of NO2. The calculated value was approximately 2% greater than the frequency implied by observations. This discrepanc ...
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