Acknowledgetnenrs-Onco f theauthors (J.-Y. Ku) would like to expressh is gratitude to the Atmospheric Turbulence and Diffusion Laboratory;
Oak Ridge;
for providing the financial support;
computer and library facilitiesa nd data. This work;
which is part or his Ph.D. dissertationi n the Department of Atmospheric Sciencesa t the State University of New York at Albany (SUNYA);
was accomplished under Interagency Agreementsa mong the U.S. Departmento f Energy;
National Oceanic and Atmospheric Administration;
the U.S. Environmental Protection Agency;
New York State Department of Environmental Conservation and SUNYA ResearchF oundation;