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OBSERVATIONS OF SIMILARITY THEORY STABILITY CORRECTION TERMS FOR MOMENTUM AND TEMPERATURE, OVER AGRICULTURAL FIELDS AND FORESTS.
Citation:
Finkelstein, P L. OBSERVATIONS OF SIMILARITY THEORY STABILITY CORRECTION TERMS FOR MOMENTUM AND TEMPERATURE, OVER AGRICULTURAL FIELDS AND FORESTS. Presented at 25th Agricultural and Forest Meteorology Conference, Norfolk, VA, May 20-24, 2002.
Impact/Purpose:
To improve the accuracy of emissions and dry deposition algorithms in the Agency's regulatory air quality and multimedia simulation models. This effort requires developing process-oriented algorithms, assembling geographical data, evaluating algorithms against field data, and designing and collaborating on field experiments to collect the data needed to test these algorithms.
Description:
Many observations of temperature and wind speed profiles have been taken over "ideal" terrain and analyzed to develop the stability correction terms which are commonly used in the application of similarity theory. Fewer observations have been taken and analyzed in this manner over more "real world" conditions. In this study four extensive data sets from recently completed field studies of atmospheric deposition are used to derive values of the stability correction terms. Observations were made over a corn field, a soybean field, a deciduous forest, and a mixed deciduous - coniferous forest. Because observations of effective surface temperature were not available, Psi-T is presented as it would be used to estimate differences in temperature between two levels in the atmosphere. Similarities and differences in the observations as a function of site, stability, and other variables are presented and discussed. Comparisons are made to published models. Points of agreement and disagreement are noted and discussed.