Speaker: Mary Whelan (Rutgers)
Title : Tracers in the Trees: sharpening new tools in carbon cycle science (abstract below). 
 
Abstract: 
Photosynthesis is the largest flux in the carbon cycle, and yet land surface models vary widely in estimating the magnitude and geography of carbon uptake.  Two methods have emerged to estimate regional land carbon sinks: carbonyl sulfide (OCS) and solar induced fluorescence (SIF).  OCS is taken up irreversibly in leaves by diffusing through plant stomata.  The drawdown of OCS over a region will scale with integrated stomatal conductance.  Here I will present the current framework for using OCS observations to make stomatal conductance estimates with implications for the carbon and water cycles.  Comparing the strengths and sources of uncertainty with SIF, I will argue that both approaches can be used together to constrain photosynthesis on ecologically important temporal and spatial scales.