Widespread reduction in sun-induced fluorescence from the Amazon during the 2015/2016 El Nino.

ABSTRACT: The tropical carbon balance dominates year-to-year variations in the CO₂ exchange with the atmosphere through photosynthesis, respiration and fires. Because of its high correlation with gross primary productivity (GPP), observations of sun-induced fluorescence (SIF) are of great interest. We developed a new remotely sensed SIF product with improved signal-to-noise in the tropics, and use it here to quantify the impact of the 2015/2016 El Niño Amazon drought. We find that SIF was strongly suppressed over areas with anomalously high temperatures and decreased levels of water in the soil. SIF went below its climatological range starting from the end of the 2015 dry season (October) and returned to normal levels by February 2016 when atmospheric conditions returned to normal, but we

SUBMITTER: Koren G 

PROVIDER: S-EPMC6178432 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature