1. Dep. of Biological Systems EngineeringWashington State Univ.PullmanWA99164
2. Dep. of Civil and Environmental EngineeringWashington State Univ.PullmanWA99164
3. Lab. for Atmospheric Research, Dep. of Civil and Environmental EngineeringWashington State Univ.PullmanWA99164
4. Dep. of Forest Ecology and ManagementSwedish Univ. of Agricultural SciencesUmeåSweden90183
5. Laboratory for Atmospheric Research, Department of Civil and Environmental EngineeringWashington State UniversityPullmanWA99164
6. U.S. Environmental Protection AgencyOffice of Research and DevelopmentCincinnatiOH45268