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In this talk, I will discuss carbon, water, and energy exchanges from a tall, old-growth forest ecosystem. This well-studied forest has a complicated vertical structure, large aboveground biomass, and a great deal of epiphytic cover. My group has measured canopy temperatures and carbonyl sulfide (OCS) concentrations at this site to better understand the dynamics of leaf and canopy energy balance, photosynthesis, and conductance. Canopy photosynthesis is inferred from OCS fluxes and compared with estimates derived from eddy flux measurements.