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Application of Satellite Solar-Induced Chlorophyll Fluorescence to Understanding Large-Scale Variations in Vegetation Phenology and Function Over Northern High Latitude ForestsThis study evaluates the large-scale seasonal phenology and physiology of vegetation over northern high latitude forests (40 deg - 55 deg N) during spring and fall by using remote sensing of solar-induced chlorophyll fluorescence (SIF), normalized difference vegetation index (NDVI) and observation-based estimate of gross primary productivity (GPP) from 2009 to 2011. Based on GPP phenology estimation in GPP, the growing season determined by SIF time-series is shorter in length than the growing season length determined solely using NDVI. This is mainly due to the extended period of high NDVI values, as compared to SIF, by about 46 days (+/-11 days), indicating a large-scale seasonal decoupling of physiological activity and changes in greenness in the fall. In addition to phenological timing, mean seasonal NDVI and SIF have different responses to temperature changes throughout the growing season. We observed that both NDVI and SIF linearly increased with temperature increases throughout the spring. However, in the fall, although NDVI linearly responded to temperature increases, SIF and GPP did not linearly increase with temperature increases, implying a seasonal hysteresis of SIF and GPP in response to temperature changes across boreal ecosystems throughout their growing season. Seasonal hysteresis of vegetation at large-scales is consistent with the known phenomena that light limits boreal forest ecosystem productivity in the fall. Our results suggest that continuing measurements from satellite remote sensing of both SIF and NDVI can help to understand the differences between, and information carried by, seasonal variations vegetation structure and greenness and physiology at large-scales across the critical boreal regions.
Document ID
20170001448
Document Type
Reprint (Version printed in journal)
Authors
Jeong, Su-Jong (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Schimel, David (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Frankenberg, Christian (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Drewry, Darren T. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Fisher, Joshua B. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Verma, Manish (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Berry, Joseph A. (Carnegie Institution of Washington Stanford, CA, United States)
Lee, Jung-Eun (Brown Univ. Providence, RI, United States)
Joiner, Joanna (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
February 8, 2017
Publication Date
December 28, 2016
Publication Information
Publication: Remote Sensing of Environment
Volume: 190
ISSN: 0034-4257
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN39047
Distribution Limits
Public
Copyright
Other
Keywords
Australia
chlorophyll fluorescence
Australia
flux tower
vegetation