Demonstration of a Global Modeling Methodology to Determine the Relative Importance of Local and Long-Distance Sources

 

Roland R. Draxler

 

Atmospheric Environment, Volume 41, Issue 4, February 2007, Pages 776-789. DOI:10.1016/j.atmosenv.2006.08.052

 

Abstract - A global 3-Dimensional (3D) transport-dispersion model was used to simulate Krypton85 (85Kr) background concentrations at five sampling locations along the US east coast during 1982 through 1983. The samplers were established to monitor the 85Kr plume downwind of the Savannah River Plant (SRP), a nuclear fuel reprocessing facility. The samplers were located 300 to 1000 km downwind of the SRP. In the original analyses of the measurements, a constant background concentration, representing an upper-limit and different for each sampling station, was subtracted from the measurements to obtain the part of the measurement representing the SRP plume. The use of a 3D global model, which includes all major 85Kr sources worldwide, was able to reproduce the day-to-day concentration background variations at the sampling locations with correlation coefficients of 0.36 to 0.46. These 3D model background predictions, without including the nearby SRP source, were then subtracted from the measured concentrations at each sampler, the result representing the portion of the measurement that can be attributed to emissions from the SRP. The revised plume estimates were a factor of 1.3 to 2.4 times higher than from the old method using a constant background subtraction. The greatest differences in the SRP plume estimates occurred at the most distant sampling stations.

 

 

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