Spectrometer System (image) University of Utah Share Print E-Mail Caption The spectrometer system mounted atop a tower in a subalpine conifer forest at Niwot Ridge, Colorado, collected data between June 2017 and June 2018. The scientists compared the solar-induced fluorescence (SIF) measured by the system to the physiological changes inside the conifer needles to better understand why we see SIF seasonal cycles. Credit Troy Magney Usage Restrictions non-commercial with attribution Share Print E-Mail 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.