33 years of non-stationary global land photosynthetic capacity observations Compton Tucker & Jorge Pinzon NASA/GSFC Change AVHRR band 1 to only green &

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Presentation transcript:

33 years of non-stationary global land photosynthetic capacity observations Compton Tucker & Jorge Pinzon NASA/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

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

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:

AVHRR Channels 1 & 2 Adjustments

Beltsville USA winter wheat biomass

NOAA AVHRR 8-km NDVI Data Set Radiation

NDVI summed vs. flux tower GPP

AVHRR 2/3 Dual Gain NDVI Adjustment

AVHRR 2/3 Dual Gain NDVI Adjustment (Jorge Pinzon NASA/GSFC)

Variances in NDVI3g NDVI data

Photosynthesis, NDVI, & Fluorescence

NDVI (potential) & Fluorescence (flux)

MODIS & AVHRR NDVI Comparisons

Arctic Tundra Biomass Comparison

Average Tundra AVHRR & MODIS

Lack of Station Keeping—Orbital Drift

Two Volcanic Aerosol Periods

NOAA AVHRR 8-km NDVI Data Set Diffuse average daily PAR[W/m2/mic] ( mic) El Chichon ( )Mt. Pinatubo ( )

NDVI summed vs. total dry biomass Explained 80% of biomass accumulation

km2 #pixels: Gome-2 AVHRR MODIS Area 1: 615, k 12M Area 2: 285, k5.7M Area3: 513, k 10M A1sub1: 22, M A2sub1: 30, M A3sub1: 28, M

Integration of NDVI Data