The Experts below are selected from a list of 189 Experts worldwide ranked by ideXlab platform

J. Lelieveld - One of the best experts on this subject based on the ideXlab platform.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small (

  • global cloud and Precipitation Chemistry and wet deposition tropospheric model simulations with echam5 messy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small ( 3 can reach ≈20%, and several important compounds (e.g., H 2 O 2 , HCHO) are substantially depleted by clouds and Precipitation.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small ( 3 can reach ≈20%, and several important compounds (e.g., H 2 O 2 , HCHO) are substantially depleted by clouds and Precipitation.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    Abstract. The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small (<10%), regional effects on O3 can reach ~20%, and several important compounds (e.g., H2O2, HCHO) are substantially depleted by clouds and Precipitation.

H. Tost - One of the best experts on this subject based on the ideXlab platform.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small (

  • global cloud and Precipitation Chemistry and wet deposition tropospheric model simulations with echam5 messy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small ( 3 can reach ≈20%, and several important compounds (e.g., H 2 O 2 , HCHO) are substantially depleted by clouds and Precipitation.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small ( 3 can reach ≈20%, and several important compounds (e.g., H 2 O 2 , HCHO) are substantially depleted by clouds and Precipitation.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    Abstract. The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small (<10%), regional effects on O3 can reach ~20%, and several important compounds (e.g., H2O2, HCHO) are substantially depleted by clouds and Precipitation.

I. Roussel - One of the best experts on this subject based on the ideXlab platform.

  • Spatial variability and source identification of rural Precipitation Chemistry in France
    Science of The Total Environment, 1996
    Co-Authors: Hervé Plaisance, Patrice Coddeville, R. Guillermo, I. Roussel
    Abstract:

    Abstract The Precipitation Chemistry in France has been examined for large-scale spatial variability using the MERA/WMO-GAW network of 13 rural sites equipped with wet-only collectors. Three classes of mean chemical compositions of MERA sites, corresponding to three different geographical regions in France have been identified by applying hierarchical clustering analysis. Factor analysis has also been performed on the deposition and concentration data sets for the three MERA sites. All the factors could be interpreted as falling into one of four categories: Acid, Sea, Neutralization, or an Agriculture/Soil association. Both sulfate and nitrate were found to be significant components of the acid factor for two stations (Morvan and Donon). These individual site analyses indicate that the sea has a strong influence on the Precipitation Chemistry at these continental stations. A comparison between factor analysis of concentrations and factor analyses of depositions suggests on the one hand that the acid forms, H 2 SO 4 and HNO 3 , seem preferentially present in cloud and on the other hand that the neutralization of Precipitation acidity by soil-derived particles and by ammonia emissions seems to depend on the geographical and climatic characteristics of a site (altitude, proximity to human activity and Precipitation amount).

R. Sander - One of the best experts on this subject based on the ideXlab platform.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small (

  • global cloud and Precipitation Chemistry and wet deposition tropospheric model simulations with echam5 messy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small ( 3 can reach ≈20%, and several important compounds (e.g., H 2 O 2 , HCHO) are substantially depleted by clouds and Precipitation.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small ( 3 can reach ≈20%, and several important compounds (e.g., H 2 O 2 , HCHO) are substantially depleted by clouds and Precipitation.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    Abstract. The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small (<10%), regional effects on O3 can reach ~20%, and several important compounds (e.g., H2O2, HCHO) are substantially depleted by clouds and Precipitation.

A. Pozzer - One of the best experts on this subject based on the ideXlab platform.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small (

  • global cloud and Precipitation Chemistry and wet deposition tropospheric model simulations with echam5 messy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small ( 3 can reach ≈20%, and several important compounds (e.g., H 2 O 2 , HCHO) are substantially depleted by clouds and Precipitation.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small ( 3 can reach ≈20%, and several important compounds (e.g., H 2 O 2 , HCHO) are substantially depleted by clouds and Precipitation.

  • Global cloud and Precipitation Chemistry and wet deposition: tropospheric model simulations with ECHAM5/MESSy1
    2007
    Co-Authors: H. Tost, P. Jöckel, A. Kerkweg, A. Pozzer, R. Sander, J. Lelieveld
    Abstract:

    Abstract. The representation of cloud and Precipitation Chemistry and subsequent wet deposition of trace constituents in global atmospheric Chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and Precipitation Chemistry and present results of the atmospheric Chemistry general circulation model ECHAM5/MESSy1. A good agreement with observed wet deposition fluxes for species causing acid rain is obtained. The new scheme enables prognostic calculations of the pH of clouds and Precipitation, and these results are also in accordance with observations. We address the influence of detailed cloud and Precipitation Chemistry on trace constituents based on sensitivity simulations. The results confirm previous results from regional scale and box models, and we extend the analysis to the role of aqueous phase Chemistry on the global scale. Some species are directly affected through multiphase removal processes, and many also indirectly through changes in oxidant concentrations, which in turn have an impact on the species lifetime. While the overall effect on tropospheric ozone is relatively small (<10%), regional effects on O3 can reach ~20%, and several important compounds (e.g., H2O2, HCHO) are substantially depleted by clouds and Precipitation.