Acquisitions from the Chlorophyll Fluorescence Imaging Spectrometer (CFIS), a new NASA airborne sensor that has been demonstrated to produce high spatial resolution estimates of solar-induced chlorophyll fluorescence (SIF), a variable tightly linked to terrestrial vegetation photosynthesis. SIF measures a direct outcome of foliar light absorption by chlorophyll, modified by biochemical feedbacks, and has been shown to provide a direct proxy for photosynthesis. Satellite-based estimates of SIF have been used to explore global-scale spatial and temporal patterns of carbon flux associated with photosynthesis, and at regional scales within the ABoVE domain have been used to represent the timing of spring photosynthetic onset and the duration of growing season carbon uptake in tundra and boreal forest ecosystems. These results have shed light on the structural and functional controls of seasonal carbon fluxes across key Arctic biomes, and helped quantify the overall carbon balance of the Arctic Boreal Zone. Additional information available here: https://above.nasa.gov/cgi-bin/inv_pgp.pl?pgid=3569.

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