The observed scatter of observations about air quality model predictions stems from a combination of naturally occurring stochastic variations that are impossible for any model to simulate explicitly and variations arising from limitations in knowledge and from imperfect input data. In this paper, historical tracer experiments of atmospheric dispersion were analyzed to develop algorithms to cha...

A multi-phase program of model intercomparison is proposed to reduce uncertainties in the global carbon budget resulting from differences among atmospheric tracer transport simulations. The TransCom program is already well underway, having begun in 1993 and completed two major experiments. The results to date are summarized in a Technical Report and indicate that significant differences among t...

2 for Arsenic 3 Ka-Ming Wai,†,# Shiliang Wu,*,†,‡ Xueling Li,‡ Daniel A. Jaffe, and Kevin D. Perry 4 †Department of Geological and Mining Engineering and Sciences and ‡Department of Civil and Environmental Engineering, 5 Michigan Technological University, Houghton, Michigan, 49931 United States 6 Physical Sciences Division, School of Science, Technology, Engineering, and Mathematics, University...

Computational fluid dynamics is used to model atmospheric transport and droplet-thin film (surface) collisions in desorption electrospray ionization; experimentally obtained droplet properties are replicated in the simulations while a "droplet pick-up" mechanism of analyte transport is confirmed.

A study on the connection between the state of the atmosphere, as represented by cluster-mean trajectories, and the chemical composition of precipitation at the Croatian GAW regional station of Zail,art is presented. The trajectory cluster analysis has been done on the basis ofdaily backward trajectories calculated for 1996, using the IIYSPLIT_4 trajectory model. The seasonal cluster analysis i...

The models used in the NRC approach to assess chronic atmospheric releases of radioactivity generate deterministic dose estimates by using standard assumptions about exposure conditions and environmental transport mechanisms. This approach has been used at the Savannah River Site since 1983. Total dose to off-site maximum individuals at the SRS from atmospheric releases has been on the order of...

An atmospheric transport model has been used to explore the relationship between source emissions and ambient air quality for individual particle phase organic compounds present in primary aerosol source emissions. An inventory of fine particulate organic compound emissions was assembled for the Los Angeles area in the year 1982. Sources characterized included noncatalystand catalyst-equipped a...

[1] This paper synthesizes a variety of atmospheric and oceanic data to examine the large-scale energy budget of the Arctic. Assessment of the atmospheric budget relies primarily on the ERA-40 reanalysis. The seasonal cycles of vertically integrated atmospheric energy storage and the convergence of energy transport from ERA-40, as evaluated for the polar cap (defined by the 70 N latitude circle...

The mean annual moisture flux across 60øS is estimated using results of numerical analyses produced by the U.S. National Centers for Environmental Prediction a d the European Centre for Medium-Range W ather Forecasts for the 7-year period 1985-1991. The atmospheric data indicate a net poleward transport of 17.06 kg m -1 s -1 or 10.74 Tt yr -1. The mean annual moisture transport divergence for t...