Fluorescence Tracks Photosynthesis (IMAGE) University of Utah Caption The seasonal dynamics of the solar-induced fluorescence (SIF, red line) closely tracks the cumulative daily Gross Primary Production (GPP, black line) in the conifer forest at Niwot Ridge, Colorado. Credit Adapted from Magney <em>et</em> <em>al</em>. <em>PNAS</em> (2019) Usage Restrictions non-commercial with attribution License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.