Vertical distributions of sulfur species simulated by large scale atmospheric models in COSAM: Comparison with observations |
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| Authors: | U LOHMANN W R LEAITCH L BARRIE K LAW Y YI D BERGMANN C BRIDGEMAN M CHIN J CHRISTENSEN R EASTER J FEICHTER A JEUKEN E KJELLSTRÖM D KOCH C LAND P RASCH G&#;J ROELOFS |
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| Institution: | Atmospheric Science Program, Department of Physics, Dalhousie University, Halifax, NS, B3H 3J5 Canada;;Meteorological Service of Canada, Downsview, ON, Canada;;Pacific Northwest National Laboratory, Richland, WA, USA;;Department of Chemistry, University of Cambridge, UK;;Atmospheric Science Division, Lawrence Livermore National Laboratory, CA, USA;;NASA Goddard Space Flight Center, Greenbelt, MD, USA;;National Environmental Research Institute, Roskilde, Denmark;;Max Planck Institute for Meteorology, Hamburg, Germany;;Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands;;Stockholm University, Stockholm, Sweden;;NASA/GISS, New York, NY, USA;;National Center for Atmospheric Research (NCAR), Boulder, CO, USA;;Institute for Marine and Atmospheric Research, Utrecht (IMAU), Utrecht University, Utrecht, The Netherlands |
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| Abstract: | A comparison of large‐scale models simulating atmospheric sulfate aerosols (COSAM) was conducted to increase our understanding of global distributions of sulfate aerosols and precursors. Earlier model comparisons focused on wet deposition measurements and sulfate aerosol concentrations in source regions at the surface. They found that different models simulated the observed sulfate surface concentrations mostly within a factor of two, but that the simulated column burdens and vertical profiles were very different amongst different models. In the COSAM exercise, one aspect is the comparison of sulfate aerosol and precursor gases above the surface. Vertical profiles of SO2, SO2?4, oxidants and cloud properties were measured by aircraft during the North Atlantic Regional Experiment (NARE) experiment in August/September 1993 off the coast of Nova Scotia and during the Second Eulerian Model Evaluation Field Study (EMEFSII), in central Ontario in March/April 1990. While no single model stands out as being best or worst, the general tendency is that those models simulating the full oxidant chemistry tend to agree best with observations although differences in transport and treatment of clouds are important as well. |
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