33 years of non-stationary global land photosynthetic capacity observations compton tucker &...
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33 years of non-stationary global land photosynthetic capacity observations
Compton Tucker & Jorge PinzonNASA/GSFC
• Change AVHRR band 1 to only green & red regions• Ground studies NDVI time series for biomass accumulation
• Transfer NDVI-biomass method to AVHRR data• Produce satellite data sets for use by others
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The TIROS-N AVHRR
Ch 1 Ch 2
(Very broad or wide spectral bands)
The NOAA person(s)
responsible for these excellent
examples of poor spectral resolution should be tarred and feathered.
Overlapping bands are a
mistake
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Bad Design for TIROS-N Channel 1
Working in 1976 with Stan Schneider and Dave McGinnis of NOAA/NESDIS, AVHRR channel 1 was changed starting with NOAA-6
From my PhD dissertation Chapter 5 (1975) and Tucker and Maxwell 1976:
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AVHRR Channels 1 & 2 Adjustments
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Beltsville USA winter wheat biomass
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NOAA AVHRR 8-km NDVI Data Set
Radiation
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NDVI summed vs. flux tower GPP
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AVHRR 2/3 Dual Gain NDVI Adjustment
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AVHRR 2/3 Dual Gain NDVI Adjustment(Jorge Pinzon NASA/GSFC)
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Variances in NDVI3g NDVI data
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Photosynthesis, NDVI, & Fluorescence
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NDVI (potential) & Fluorescence (flux)
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MODIS & AVHRR NDVI Comparisons
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Arctic Tundra Biomass Comparison
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Average Tundra AVHRR & MODIS
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Lack of Station Keeping—Orbital Drift
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Two Volcanic Aerosol Periods
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NOAA AVHRR 8-km NDVI Data Set Diffuse average daily PAR[W/m2/mic] (0.4-0.7 mic)
El Chichon (1982-1984) Mt. Pinatubo (1991-1994)
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NDVI summed vs. total dry biomass
Explained 80% of biomass
accumulation
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km2 #pixels: Gome-2 AVHRR MODISArea 1: 615,620 3369.6k 12M Area 2: 285,112 1444.5k 5.7MArea3: 513,017 2808.1k 10M A1sub1: 22,573 32373 0.5MA2sub1: 30,342 49477 0.7MA3sub1: 28,268 49444 0.6M
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Integration of NDVI Data