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OVERVIEW OF THE OZARK ISOPRENE EXPERIMENT (OZIE)
Citation:
Pierce Jr., T E., M. Koerber, A. Guenther, S. King, S. Lingerich, AND J. Turner. OVERVIEW OF THE OZARK ISOPRENE EXPERIMENT (OZIE). Presented at 92nd Annual Meeting of the Air and Waste Management Association, St. Louis, MO, June 20-24, 1999.
Description:
Ozone modeling studies, such as those performed for the Ozone Transport Advisory Group (OTAG), have raised concerns about extremely high isoprene concentrations (. 50ppbv) that have been predicted over the Ozark Plateau in southern Missouri. In response to these concerns, a collaborative study was undertaken involving participants from AMEREN, U.S. Department of Army at Fort Leonard Wood, Lake Michigan Air Directors Consortium, National Center for Atmospheric Research, Perdue University, U.S. Environmental Protection Agency, Washington State University, Washington University (St. Louis), and the states of Illinois, Indiana, and Missouri. The Ozark Isoprene Experiment (OZIE) took place during July 1998 and included measurements of isoprene from the surface and aloft at several locations stretching from northeastern Oklahoma to southern Indiana. Measurements were made along a balloon tethered to nearly 1000 m, surface footprint sites at five locations upwind of the balloon, surface sites in Illinois and Indiana, and from an aircraft flying at heights ranging from 300 to 1000 m over southern Illinois, southern Indiana, and souther Missouri. Preliminary analysis of the data indicates that daytime surface isoprene concentrations ranged from 0.4 to 6 ppbv. Conditions were favorable for the emission of isoprene, with daytime maximum temperatures exceeding 32 C on at least four days during the two-week study period. This paper provides an overview of the study design and describes measurements taken during the experiment.