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The 2010 Russian Drought Impact on Satellite Measurements of Solar-Induced Chlorophyll Fluorescence: Insights from Modeling and Comparisons with the Normalized Differential Vegetation Index (NDVI)We examine satellite-based measurements of chlorophyll solar-induced fluorescence (SIF) over the region impacted by the Russian drought and heat wave of 2010. Like the popular Normalized Difference Vegetation Index (NDVI) that has been used for decades to measure photosynthetic capacity, SIF measurements are sensitive to the fraction of absorbed photosynthetically-active radiation (fPAR). However, in addition, SIF is sensitive to the fluorescence yield that is related to the photosynthetic yield. Both SIF and NDVI from satellite data show drought-related declines early in the growing season in 2010 as compared to other years between 2007 and 2013 for areas dominated by crops and grasslands. This suggests an early manifestation of the dry conditions on fPAR. We also simulated SIF using a global land surface model driven by observation-based meteorological fields. The model provides a reasonable simulation of the drought and heat impacts on SIF in terms of the timing and spatial extents of anomalies, but there are some differences between modeled and observed SIF. The model may potentially be improved through data assimilation or parameter estimation using satellite observations of SIF (as well as NDVI). The model simulations also offer the opportunity to examine separately the different components of the SIF signal and relationships with Gross Primary Productivity (GPP).
Document ID
20160000352
Acquisition Source
Goddard Space Flight Center
Document Type
Accepted Manuscript (Version with final changes)
Authors
Y Yoshida
(Science Systems and Applications (United States) Lanham, Maryland, United States)
J Joiner
(Goddard Space Flight Center Greenbelt, Maryland, United States)
C Tucker
(Goddard Space Flight Center Greenbelt, Maryland, United States)
J Berry
(Carnegie Insitution for Science Stanford, CA, United States)
J E Lee
(Brown University Providence, Rhode Island, United States)
G Walker
(Science Systems and Applications (United States) Lanham, Maryland, United States)
R Reichle
(Goddard Space Flight Center Greenbelt, Maryland, United States)
R Koster
(Goddard Space Flight Center Greenbelt, Maryland, United States)
A Lyapustin
(Goddard Space Flight Center Greenbelt, Maryland, United States)
Y Wang
(University of Maryland, Baltimore County Baltimore, Maryland, United States)
Date Acquired
January 6, 2016
Publication Date
June 24, 2015
Publication Information
Publication: Remote Sensing of Environment
Publisher: Elsevier
Volume: 166
Issue Publication Date: September 1, 2015
ISSN: 0034-4257
Subject Category
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN19995
Funding Number(s)
CONTRACT_GRANT: NNX10AT36A
CONTRACT_GRANT: NNG12HP08C
CONTRACT_GRANT: NNG12HP06C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
vegetation
vegetation index
MODIS
chlorophyll
Fluorescence
APAR
FPAR
drought
NDVI
GOME-2
GPP
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