A006-0008
Observing canopy-scale relationships between ozone flux, conductance, photosynthesis (SIF), and leaf skin temperature

Monday, 7 December 2020
Poster
Laura Barry1, Madeline Miles1, Ester Rekhelman1, Koong Yi1, Xi Yang1, Elizabeth Tatham1, Todd M Scanlon1, Manuel Lerdau1, Gabriel A Isaacman-VanWertz2 and Sally E. Pusede3, (1)University of Virginia, Environmental Sciences, Charlottesville, VA, United States, (2)Virginia Polytechnic Institute and State University, Civil and Environmental Engineering, Blacksburg, VA, United States, (3)University of Virginia, Department of Environmental Science, Charlottesville, VA, United States
Abstract:
Tropospheric ozone (O3) is an air pollutant that adversely affects plants and ecosystems. O3 exposure causes physiological and biochemical changes in plants, reducing carbon assimilation and inhibiting photosynthesis. Numerous uncertainties remain regarding the effects of O3 uptake at the canopy scale and whether there are feedbacks from these effects on the O3 lifetime. We present measurements of O3, carbon dioxide, and water vapor eddy-covariance fluxes, solar induced fluorescence (SIF), a proxy for the electron transport rate in photosynthesis, and leaf skin temperature collected from a tower in Central Virginia. Using 1.5 years of canopy-scale measurements, we statistically evaluate relationships among these variables, focusing on the influence of O3 uptake on canopy-scale ecological processes and investigating potential feedbacks on the O3 loss rate. We contextualize these results with a regional analysis of the Southeastern U.S. using O3 surface measurements from the EPA, satellite observations of SIF from TROPOMI, and landcover type and surface temperature data from MODIS.
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