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Sabine Eckhardt

last modified 2008-09-20 14:38

Research Scientist, Department of Atmospheric and Climate Research

sabineWelcome!



NILU Norwegian Institute for Air Research
PO Box 100, N-2027 Kjeller, Norway
phone + 47 - 6389 8187, fax + 47 - 6389 - 8050,
mail:sec@nilu.no





RESEARCH


Record high peaks in PCBs due to atmsopheric long-range transport of biomass burning emissions

Courtesy Ann-Christine Engvall, view from measurement station Zeppelin during (non) fire influenced period Soils and forests in the boreal region of the northern hemisphere are recognised as having a large capacity for storing air-borne Persistent Organic Pollutants (POPs), such as the polychlorinated biphenyls (PCBs). Following reductions of primary emissions of various legacy POPs, there is an increasing interest and debate about the relative importance of secondary re-emissions on the atmospheric levels of POPs. In spring of 2006, biomass burning (BB) emissions from agricultural fires in Eastern Europe were transported to the Zeppelin station on Svalbard, where record-high levels of many air pollutants were recorded. Here we report on the extremely high concentrations of PCBs that were also measured during this period. 21 out of 32 PCB congeners were enhanced by more than two standard deviations above the long-term mean concentrations. In July 2004, about 5.8 million hectare of boreal forest burned in North America, emitting a pollution plume which reached the Zeppelin station after a travel time of 3-4 weeks. Again, 12 PCB congeners were elevated above the long-term mean by more than two standard deviations, with the less chlorinated congeners being most strongly affected. We propose that these abnormally high concentrations were caused by BB emissions.

Eckhardt, S., K. Breivik, S. Manoe, A. Stohl: Record high peaks in PCB concentrations in the Arctic atmosphere due to long-range transport of biomass burning emissions, Atmos. Chem. Phys. , 7, 4527-4536, 2007.

Transport Pathways as derived from a 15-Year Climatology of Tracer Transport
Transport pathways derived from the 15-year climatology of tracer transport as simulated with FLEXPART. The green arrows show typical transport pathways below 3 km and the black arrows indicate pathways above 3 km. These transport pathways show differences during extreme phases of the North Atlantic Oscillation. During high phases of the NAO more tracer is found in the Arctic. Movies of tracer transport are shown at: http://www.forst.tu-muenchen.de/EXT/LST/METEO/arcticpollution/ More information can be found in:

Eckhardt, S., A. Stohl, S. Beierle, N. Spichtinger, P. James, C. Forster, C. Junker, T. Wagner, U. Platt, and S. G. Jennings, 2003: The North Atlantic Oscillation controls air pollution transport to the Arctic, Atmos. Chem. Phys., 3, 1769-1778, 2003.


A 15-Year Climatology of Warm Conveyor Belts
Eckhardt, S., A, Stohl, H. Wernli, P. James, C. Forster and N. Spichtinger, A 15-Year Climatology of Warm Conveyor Belts, J. Climate, 17, 218-237, 2004.




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