Solar-induced fluorescence retrievals in the context of physiological, environmental, and hardware-based sources of uncertainty

Julia K. Marrs; Lucy R. Hutyra; David W. Allen

doi:10.1117/12.2520457

14 May 2019 Solar-induced fluorescence retrievals in the context of physiological, environmental, and hardware-based sources of uncertainty

Julia K. Marrs, Lucy R. Hutyra, David W. Allen

Author Affiliations +

Proceedings Volume 10986, Algorithms, Technologies, and Applications for Multispectral and Hyperspectral Imagery XXV; 109860F (2019) https://doi.org/10.1117/12.2520457
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

The terrestrial biosphere is a crucial sink for anthropogenic emissions of carbon to the atmosphere, but is also the source of the largest uncertainties in estimated global carbon budgets. Numerous tower- and satellite-based platforms have recently been established to measure solar-induced fluorescence (SIF), which, as a proxy for photosynthesis, shows great promise for constraining global estimates of gross primary productivity. Nonetheless, published SIF retrievals span two orders of magnitude, illustrating an opportunity for improved characterization of the SIF signal in the context of instrument noise, detector calibrations and limitations, viewing geometry, and typical signal magnitude. In 2017, the Forested Optical Reference for Evaluating Sensor Technology (FOREST) site was established at the National Institute of Standards and Technology (NIST) as a test-bed for SIF instrument intercomparison and calibration methods development. Further, we empirically characterize the physiological and ecological meaning of SIF by directly linking to carbon exchange with an extensive suite of ground measurements. Following optimizations to our SIF spectrometer deployment, we find that deviations from ideal measurement conditions, including low light or intermittent cloud cover, introduce significant noise outside even dramatic physiological manipulations. It is critical that common standards are developed for SIF measurement systems to ensure validation of data quality and clear linkages to physiological and biophysical parameters. SIF is a promising technique to improve measurement and understanding of local to global trends in primary productivity, but data quality control is a key challenge to tackle with the rapid deployment of new sensors across the globe. This work is an initial evaluation of sensitivities of SIF signals to hardware and methodologies.

Citation Download Citation

Julia K. Marrs, Lucy R. Hutyra, and David W. Allen "Solar-induced fluorescence retrievals in the context of physiological, environmental, and hardware-based sources of uncertainty", Proc. SPIE 10986, Algorithms, Technologies, and Applications for Multispectral and Hyperspectral Imagery XXV, 109860F (14 May 2019); https://doi.org/10.1117/12.2520457

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