Methods:
We use grating spectrometers to measure SIF from the Ameriflux tower. A fibre optic cable with a scanning telescope lens will be mounted to the tower, approximately 10 m above the canopy level. The spectrometer and computer controller will be housed in the lab below. The spectrometer is thermally stabilized using heaters and a thermoelectric coller. Data collection will be automated, so we expect that after setting up the instrument, we will need minimal human intervention.