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Consistency Between Sun-Induced Chlorophyll Fluorescence and Gross Primary Production of Vegetation in North AmericaAccurate estimation of the gross primary production (GPP) of terrestrial ecosystems is vital for a better understanding of the spatial-temporal patterns of the global carbon cycle. In this study,we estimate GPP in North America (NA) using the satellite-based Vegetation Photosynthesis Model (VPM), MODIS (Moderate Resolution Imaging Spectrometer) images at 8-day temporal and 500 meter spatial resolutions, and NCEP-NARR (National Center for Environmental Prediction-North America Regional Reanalysis) climate data. The simulated GPP (GPP (sub VPM)) agrees well with the flux tower derived GPP (GPPEC) at 39 AmeriFlux sites (155 site-years). The GPP (sub VPM) in 2010 is spatially aggregated to 0.5 by 0.5-degree grid cells and then compared with sun-induced chlorophyll fluorescence (SIF) data from Global Ozone Monitoring Instrument 2 (GOME-2), which is directly related to vegetation photosynthesis. Spatial distribution and seasonal dynamics of GPP (sub VPM) and GOME-2 SIF show good consistency. At the biome scale, GPP (sub VPM) and SIF shows strong linear relationships (R (sup 2) is greater than 0.95) and small variations in regression slopes ((4.60-5.55 grams Carbon per square meter per day) divided by (milliwatts per square meter per nanometer per square radian)). The total annual GPP (sub VPM) in NA in 2010 is approximately 13.53 petagrams Carbon per year, which accounts for approximately 11.0 percent of the global terrestrial GPP and is within the range of annual GPP estimates from six other process-based and data-driven models (11.35-22.23 petagrams Carbon per year). Among the seven models, some models did not capture the spatial pattern of GOME-2 SIF data at annual scale, especially in Midwest cropland region. The results from this study demonstrate the reliable performance of VPM at the continental scale, and the potential of SIF data being used as a benchmark to compare with GPP models.
Document ID
20160010306
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Zhang, Yao
(Oklahoma Univ. Norman, OK, United States)
Xiao, Xiangming
(Oklahoma Univ. Norman, OK, United States)
Jin, Cui
(Oklahoma Univ. Norman, OK, United States)
Dong, Jinwei
(Oklahoma Univ. Norman, OK, United States)
Zhou, Sha
(Tsinghua Univ. Beijing, China)
Wagle, Pradeep
(Oklahoma Univ. Norman, OK, United States)
Joiner, Joanna
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Guanter, Luis
(GeoForschungsZentrum Potsdam, Germany)
Zhang, Yongguang
(Nanjing Univ. China)
Zhang , Geli
(Oklahoma Univ. Norman, OK, United States)
Qin, Yuanwei
(Oklahoma Univ. Norman, OK, United States)
Wang, Jie
(Oklahoma Univ. Norman, OK, United States)
Moore, Berrien, III
(Oklahoma Univ. Norman, OK, United States)
Date Acquired
August 12, 2016
Publication Date
June 5, 2016
Publication Information
Publication: Remote Sensing of Environment
Publisher: Elsevier
Volume: 183
ISSN: 0034-4257
Subject Category
Meteorology And Climatology
Life Sciences (General)
Report/Patent Number
GSFC-E-DAA-TN34489
Funding Number(s)
CONTRACT_GRANT: DE-FC02-06ER64159
CONTRACT_GRANT: USDA 04-CA-11330147-238
CONTRACT_GRANT: NNL11AA00B
CONTRACT_GRANT: USDA 03-CA-11330147-073
CONTRACT_GRANT: DE-SC0006708
CONTRACT_GRANT: NSF IIA-1301789
CONTRACT_GRANT: NSF OPP 0421588/ARC-1204263
CONTRACT_GRANT: USDA 2013-69002
Distribution Limits
Public
Copyright
Other
Keywords
photosynthesis model
flux tower
vegetation
chlorophyll fluorescence
absorbed PAR
gross primary productivity

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