atmospheric chemistry Articles

  • Model Inter-Comparison on Transport and Chemistry

    A comprehensive inter-comparison of 5 atmospheric chemistry transport models (TM5, TM4, TM3, IMAGES, and LMDZ) has been performed. The main objective was to analyze differences in model transport, in particular vertical mixing (boundary layer and convective transport), synoptic variations, and large scale global circulation (including inter-hemispheric exchange and stratospheric tropospheric ...


  • Study of precipitation chemistry over an industrial city

    The growing trend of industrialization has marked impact on the atmospheric chemistry around the globe. Such impacts are also predicted for developing countries like India. Acid precipitation due to secondary pollutants is one of them. The present investigation was conducted with an aim of studying the precipitation chemistry over Asansol city, India during the monsoon season. The rain water ...

  • A Lagrangian particle model with chemical reactions: application in real atmosphere

    In this work, a Lagrangian particle model able to account for simple chemical reactions between NO and O3 has been improved to consider the photolysis of NO2. A system of chemical equations is numerically solved on a Eulerian grid, while the particle trajectories are moved in a Lagrangian frame. The ...


    By Inderscience Publishers

  • Model predictions of toxaphene degradation in the atmosphere over North America

    Technical toxaphene (TT), a broad‐spectrum pesticide mixture, degrades in the environment, resulting in potential changes in toxicity. The present study uses a multi‐media model that we developed to estimate toxaphene degradation in the atmosphere over North America. The predicted degradation has strong spatial and temporal variability determined by processes such as emission and transport of ...


    By John Wiley & Sons, Ltd.

  • Regulatory atmospheric short and medium range dispersion models in Italy

    Since the (partial) acceptance in Italy of the EU Directive 85/337/EEC concerning environmental impact assessment procedures, there has been a rapid growth in the use of atmospheric dispersion simulation tools, which are also being used in air-quality management plans. This paper describes the state of the art in the development and application in Italy of the short and medium range ...


    By Inderscience Publishers

  • Uncertainties in the meteorological input of the chemistry-transport models and some examples of their consequences

    In this article, selected weather prediction model parameters, which are important for air pollution studies, were verified against measurements at two sounding stations in Finland. In 1996–1998, the short-time model-measurement differences were rather high. The friction velocity was on average overestimated by 30–70%, the mixing height during spring months was underestimated by up to 60%, 2 m ...


    By Inderscience Publishers

  • Staff spotlight: atmospheric chemist addresses California air quality issues

    With over a decade of experience addressing West Coast air quality issues, Dr. Charles Lee, Managing Consultant in Trinity’s Irvine, California office, is a valuable resource on air quality, greenhouse gas (GHG), and risk related issues such as permitting requirements, air quality monitoring, source testing, auditing, GHG verifications, and health risk assessments. Dr. Lee is particularly ...


    By Trinity Consultants

  • Parsing pyrogenic PAHs: Forensic chemistry, receptor models, and source control policy

    A realistic understanding of contaminant sources is required to set appropriate control policy. Forensic chemical methods can be powerful tools in source characterization and identification, but they require a multiple‐lines‐of‐evidence approach. Atmospheric receptor models, such as EPA's Chemical Mass Balance (CMB), are increasingly being used to evaluate sources of pyrogenic polycyclic ...


    By John Wiley & Sons, Ltd.

  • A connection between cycle chemistry and condenser configuration: part II

    Abstract Air in-leakage into the steam space of a condenser can become stored in pockets of high partial pressures that negatively impact condenser performance and become a source of dissolved gases in the feedwater. These pockets can be configuration caused and generally cannot be eliminated by reducing air ingress or increasing venting capacity. Fortunately, engineering designs are ...


    By Intek, Inc.

  • Fog and precipitation chemistry at a mid-land forest in central Taiwan

    We analyzed fog and bulk precipitation chemistry at a cloud forest in central Taiwan where mountain agriculture activities are highest. There were 320 foggy days (visibility <1000 m) recorded between April 2005 and March 2006. Fog was most frequent between April 2005 and July 2005 and in March 2006 (153/153 d) and least frequent in January 2006 (21/31 d). The total fog duration was 2415 h, ...

  • 2016 Presidential Green Chemistry Challenge Award Winners Announced

    On June 13, 2016, the U.S. Environmental Protection Agency (EPA) announced the winners of the 2016 Presidential Green Chemistry Challenge Awards (PGCCA). The PGCCA honors green chemistry technologies that solve climate and environmental problems through creating business ...


    By Bergeson & Campbell, P.C.

  • Atmospheric dispersion and chemical pollutant transformation simulated with parallel calculations using two PC clusters

    The numerical simulation of atmospheric pollution needs long calculation times, mainly due to the chemistry involved, for example in photochemical episodes for which a lot of species and reactions must be taken into account. Parallelisation can reduce these calculation times. In this work, we have made parallel computation with a Eulerian transport/chemical model with the MPI communication ...


    By Inderscience Publishers

  • Modeling Mercury Fluxes and Concentrations in a Georgia Watershed Receiving Atmospheric Deposition Load from Direct and Indirect Sources

    Mercury (Hg) is considered a priority pollutant because of its toxicity and potential for strong bioaccumulation.There are many serious environmental and human health concerns associated with elevated levels of Hg linked to industrial ...

  • Characterizinig Precipitation Chemistry in Changhua, Central Taiwan Using Weather Conditions And Multivariate Analysis

    Few studies of atmospheric deposition come from the fast growing region of Southeast Asia. Precipitation in Changhua City in central Taiwan was collected to examine its chemical composition and relationship with meteorological patterns. Fifty percent of the precipitation measurements had pH ...


    By Springer

  • An evaluation of the residual toxicity and chemistry of a sodium hydroxide‐based ballast water treatment system for freshwater ships

    Non‐native organisms in the ballast water (BW) of freshwater ships must be killed to prevent the spread of invasive species. The ideal BW treatment system (BWTS) would kill 100% of BW organisms with minimal residual toxicity to organisms in receiving waters. The residual toxicity and chemistry of a BWTS was evaluated: sodium hydroxide was added to elevate pH to > 11.5 to kill BW organisms, ...


    By John Wiley & Sons, Ltd.

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