||Evaluation of the Kriging Method to Predict 7-h Seasonal Mean Ozone Concentrations for Estimating Crop Losses (Journal Version).
Lefohn, A. S. ;
Knudsen, H. P. ;
Logan, J. A. ;
Simpson, J. ;
Bhumralkar, C. ;
||A.S.L. and Associates, Helena, MT. ;Harvard Univ., Cambridge, MA. ;Battelle Pacific Northwest Labs., Richland, WA. ;National Oceanic and Atmospheric Administration, Rockville, MD.;Corvallis Environmental Research Lab., OR.
Farm crops ;
Seasonal variations ;
Statistical analysis ;
Economic impact ;
Rural areas ;
Urban areas ;
Air pollution effects(Plants) ;
National Crop Loss Assessment Network(NCLAN)
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Using kriging, a statistical technique, the National Crop Loss Assessment Network (NCLAN) program estimated growing season 5-month (May-September) ambient 7-h mean O3 concentrations for each of the major crop growing areas of the United States for 1978-1982. The O3 estimates were used to predict economic benefits anticipated by lowering O3 levels in the United States. The paper reviews NCLAN's use of kriging to estimate 7-h seasonal mean O3 concentrations for crop growing regions. Although the original kriging program used by NCLAN incorrectly calculated the diagonal elements of the kriging equations, this omission did not result in significant errors in the predicted estimates. Most of the data used in estimating the 7-h seasonal values were obtained from urban areas; the use of these data tended to underestimate the 7-h seasonal O3 concentrations in rural areas. It is recommended that only O3 data that are representative of agricultural areas and have been collected under accepted quality assurance programs be used in future kriging efforts. (Copyright (c) 1987 APCA.)