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OZARKS ISOPRENE EXPERIMENT (OZIE): MEASUREMENTS AND MODELING OF THE ISOPRENE VOLCANO
Citation:
WIEDINMYER, C., J. GREENBERG, A. GUENTHER, B. HOPKINS, K. BAKER, C. D. GERON, P. I. PALMER, B. P. LONG, J. R. TURNER, G. PETRON, P. HARLEY, T. E. PIERCE, B. LAMB, H. WESTBERG, W. BAUGH, M. KOERBER, AND M. JANSSEN. OZARKS ISOPRENE EXPERIMENT (OZIE): MEASUREMENTS AND MODELING OF THE ISOPRENE VOLCANO. JOURNAL OF GEOPHYSICAL RESEARCH: ATMOSPHERES. American Geophysical Union, Washington, DC, 110(D18307):1-17, (2005).
Description:
The Ozarks Isoprene Experiment (OZIE) was conducted in July 1998 in Missouri, Illinois, Indiana, and Oklahoma. OZIE was designed to investigate the presumed strong isoprene emission rates from the Missouri Ozarks, where there is a high density of oak trees that are efficient isoprene emitters. Ground, balloon, and aircraft measurements were taken over a three-week study period; chemical models were subsequently used to better understand the observed isoprene emissions from the Ozarks and to investigate their potential regional-scale impacts. The emission capacities exhibited a temperature dependence that is not captured by commonly used biogenic emission models. Isoprene mixing ratios measured aloft from tethered balloon systems were used to estimate isoprene fluxes. Ground-level isoprene mixing ratios exhibited substantial spatial heterogeneity. The agreement between measured isoprene mixing ratios and regional-scale chemical transport model estimates was improved upon averaging the ground level isoprene data observed at several sites within a representative area.