Airborne Solar-Induced Chlorophyll Fluorescence to Characterize Arctic Boreal Zone Productivity
Abstract
The development of methods to retrieve vegetation solar-induced fluorescence (SIF) emission from satellite platforms have opened up the possibility of remotely monitoring photosynthetic function, augmenting the established structural and biochemical parameter retrieval methodologies from reflectance and lidar-based observing systems. The Chlorophyll Fluorescence Imaging Spectrometer (CFIS) was developed for OCO-2 validation purposes and provides an airborne capability to help fill the spatial gap between leaf- or canopy-level observations of SIF flux and extensive satellite footprints. CFIS is a high-resolution (<0.1nm) spectrometer covering the 740-770 nm wavelength range, optimized for SIF retrieval.
Here we present an overview of the instrument capabilities, and discuss the CFIS airborne campaign conducted across Western Canada and Alaska as part of the 2017 Arctic-Boreal Vulnerability Experiment (ABoVE). The flexibility of an airborne instrument allowed for sampling of the temporal variability of SIF emission over consecutive days, or with meteorological variability throughout a day, at eddy covariance flux tower sites across the ABoVE domain, during the peak of the growing season. The 2017 ABoVE campaign included contemporaneous acquisitions of airborne visible through shortwave infrared (VSWIR) reflectance from the AVIRIS-NG sensor, as well as full waveform lidar acquisitions (LVIS), producing a rich dataset for studies targeting multi-sensor synthesis for constraining northern latitude vegetation function. Here we focus on the analysis of airborne SIF at more than 20 tower-based eddy covariance sites sampled during the campaign, representing a diverse collection of biomes and climate regimes spanning the ABoVE domain. AVIRIS reflectance data are used to filter for vegetated land cover within the footprint of the sampled eddy covariance towers, and to contrast structural and biochemical variations across the tower sites.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.B14D..03D
- Keywords:
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- 0426 Biosphere/atmosphere interactions;
- BIOGEOSCIENCES;
- 0428 Carbon cycling;
- BIOGEOSCIENCES;
- 0439 Ecosystems;
- structure and dynamics;
- BIOGEOSCIENCES;
- 0475 Permafrost;
- cryosphere;
- and high-latitude processes;
- BIOGEOSCIENCES