Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 2 2007 10.5194/acpd-7-3837-2007 http://www.atmos-chem-phys-discuss.net/7/3837/2007/ http://www.atmos-chem-phys-discuss.net/7/3837/2007/acpd-7-3837-2007.html http://www.atmos-chem-phys-discuss.net/7/3837/2007/acpd-7-3837-2007.pdf 3837 3857 2007-03-16 GEM/POPs: a global 3-D dynamic model for semi-volatile persistent organic pollutants – Part 2: Global transports and budgets of PCBs P. Huang S. L. Gong sunling.gong@ec.gc.ca T. L. Zhao L. Neary L. A. Barrie Air Quality Research Division, Science & Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, Ontario M3H 5T4, Canada Department of Chemical Engineering and Applied Chemistry, University of Toronto 200 College Street, Toronto, Ontario, Canada, M5S 3E5, Canada Department of Earth and Space Science and Engineering, York University 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada Atmospheric Research and Environment Program World Meteorological Organization 7 bis, avenue de la Paix, BP2300, 1211 Geneva 2, Switzerland Global transports and budgets of three PCBs were investigated with a 3-D dynamic model for semi-volatile persistent organic pollutants – GEM/POPs. Dominant pathways were identified for PCB transports in the atmosphere with a peak transport flux below 8 km and 14 km for gaseous and particulate PCB28, 4 km and 6 km for gaseous and particulate PCB180. The inter-continental transports of PCBs in the Northern Hemisphere (NH) are dominated in the zonal direction with their route changes seasonally regulated by the variation of westerly jet. The transport pathways from Europe and North Atlantic to the Arctic contributed the most PCBs over there. Inter-hemispheric transports of PCBs originated from the regions of Europe, Asia and North America in three different flow-paths, accompanying with easterly jet, Asian monsoon winds and trade winds. PCBs from the Southern Hemisphere (SH) could export into the NH. According to the PCB emissions of year 2000, Europe, North America and Asia are the three largest sources of the three PCBs, contributing to the global background concentrations in the atmosphere and soil and water. Globally, PCB28 in soil and water has become a comparable source to the anthropogenic emissions while heavier PCBs such as PCB153 and 180 are still transporting into soil and water. It is found that lighter PCBs have more long range transport potentials than their heavier counter-parts in the atmosphere. Breivik, K., Sweetman, A., Pacyna, J. M., and Jones, K. C.: Towards a global historical emission inventory for selected PCB congeners – a mass balance approach 2. Emissions, Sci. Total Environ., 290, 199–224, 2002. Côté, J., Gravel, S., Méthot, A., Patoine, A., Roch, M., and Staniforth, A.: The operational CMC-MRB Global Environmental Multiscale (GEM) model: Part I – Design considerations and formulation, Mon. Wea. Rev., 126, 1373–1395, 1998. Gong, S. L., Barrie, L. A., Blanchet, J.-P., Salzen, K. v., Lohmann, U., Lesins, G., Spacek, L., Zhang, L. M., Girard, E., Lin, H., Leaitch, R., Leighton, H., Chylek, P., and Huang, P.: Canadian Aerosol Module: A size-segregated simulation of atmospheric aerosol processes for climate and air quality models 1. Module development, J. Geophys. Res., 108, 4007, doi:10.1029/2001JD002002, 2003. Gong, S. L., Huang, P., Zhao, T. L., Sahsuvar, L., Barrie, L. A., Kaminski, J. W., Li, Y. F., and Niu, T.: GEM/POPs: A Global 3-D Dynamic Model for Semi-volatile Persistent Organic Pollutants 1. Model description and evaluations, Atmos. Chem. Phys. Discuss., 7, 3397–3422, 2007. Hansen, K. M., Christensen, J. H., Brandt, J., Frohn, L. M., and Geels, C.: Modelling atmospheric transport persistent organic pollutants in Northern Hemisphere with a 3-D dynamical model: DEHM-POP, Atmos. Chem. Phys., 4, 1339–1369, 2005. Koziol, A. S. and Pudykiewicz, J. A.: Global-scale environmental transport of persistent organic pollutants, Chemosphere, 45, 1181–1200, 2001. Ma, J., Daggupaty, S., Harner, T., and Li, Y.-F.: Impacts of Lindane usage in the Canadian prairies on the Great Lakes ecosystem, 1. Coupled atmospheric transport model and modeled concentrations in air and soil, Envion. Sci. Technol., 37(17), 3774–3781, 2003. Mackay, D.: Multimedia Environmental Models: The Fugacity Approach. CRC Press, New York, 2001. Mackay, D., Webster, E., and Gouin, T.: Partitioning, Persistence and Long-Range Transport, in: Chemicals in the Environment: Assessing and Managing Risk, edited by: Hester, R. E. and Harrison, R. M., Royal Society of Chemistry, Cambridge, UK, 2006. Malanichev, A., Mantseva, E., Shatalov, V., Strukov, B., and Vulykh, N.: Numerical evaluation of the PCBs transport over the Northern Hemisphere. Environ. Pollut., 128, 279–289, 2004. Semeena, V. S. and Lammel, G.: The significance of the grasshopper effect on the atmospheric distribution of president organic substances, Geophys. Res. Lett., 32, L07804, doi:10.1029/2004GL022229, 2005. van Jaarsveld, J. A., van Pul, W. A. J., and de Leeuw, F. A. A. M.: Modelling transport and deposition of persistent organic pollutants in the European region, Atmos. Environ., 31, 1011–1024, 1997. Wania, F.: Assessing the potential of persistent organic chemicals for long-range transport and accumulation in polar regions, Environ. Sci. Technol., 37, 1344–1351, 2003. Wania, F., Mackay, D., Li, Y.-F., Bidleman, T. F., and Strand, A.: Global chemical fate of alpha-hexachlorocyclohexane. 1. Evaluation of a global distribution model, Environ. Toxicol. Chem., 18, 1390–1399, 1999.