Flux–Model–MODIS Evaluation Dick Olson, Tom Boden, Bob Cook, Lisa Olsen, Steve Margle, many...
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Transcript of Flux–Model–MODIS Evaluation Dick Olson, Tom Boden, Bob Cook, Lisa Olsen, Steve Margle, many...
![Page 1: Flux–Model–MODIS Evaluation Dick Olson, Tom Boden, Bob Cook, Lisa Olsen, Steve Margle, many others Oak Ridge National Laboratory* Oak Ridge, Tennessee,](https://reader035.fdocuments.in/reader035/viewer/2022062322/5697bfe01a28abf838cb3316/html5/thumbnails/1.jpg)
Flux–Model–MODISFlux–Model–MODISEvaluationEvaluation
Dick Olson, Tom Boden,Bob Cook, Lisa Olsen,
Steve Margle, many othersOak Ridge National Laboratory*
Oak Ridge, Tennessee, USA
*Managed by the University of Tennessee-Battelle LLC under contract DE-AC05-00OR22725 with the U.S. Department of Energy.
EMDI 3 Working GroupApril 2002
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22 ORNL DAAC ORNL DAAC
Components NEE – eddy covariance flux towers NPP – ecosystem field measurements MODIS – EOS Validation program Modeled NPP – ad hoc participation EMDI 3 Prototype exercise:
– 3 sites (history of timely data processing)° Harvard Forest – Bill Monger° UMBS – Peter Curtis° Metolius – Bev Law
– Scaling issues: ° NEE vs NPP° >1 km2 vs point° 0.5 hr vs daily
– Comparison statistics: correlations?
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33 ORNL DAAC ORNL DAAC
Flux-Model-MODIS Comparison
Fluxes: 17 towers – Micrometeorology posted near real-time
– Gap-filled flux estimates posted annually Models: 5 models participating (open to others)
– Common site characteristics–model driver data MODIS: 7 products for 52 sites (8-day composites)
– Surface Temperature, Vegetation Index, LAI, fPAR, Photosynthesis (8-day and annual), Surface Reflectance, BRDF
– Sites include Core Validation Sites, Flux Tower Sites, BigFoot Sites, Real Time Validation activity, and LAINet Sites
Format is 7 km x 7 km cutouts in ISIN projection in ASCII files
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Re-projecting MODIS DataPark Falls, WI
UTMUTMIntegerized SinusoidalIntegerized Sinusoidal
MODIS sinusoidalMODIS sinusoidal
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Harvard Forest, ISIN, all pixels in 5x5 km area: LAI, fPAR, EVI, PSN
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Harvard Forest, ISIN, good pixels in 3x3 km area: LAI, fPAR, EVI, PSN
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Metolius •PSN product•All pixels in 3x3 area Two distinct setsof PSN values, may bedue to different land cover types
Metolius •PSN product•All pixels in 3x3 area Two distinct setsof PSN values, may bedue to different land cover types
Heterogeneity in MODIS
pixels near tower
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Walker Branch•Pixels with LAI and PSN•All pixels in 5x5km area• MODIS landcover: broadleaf crops (8 pixels) broadleaf forest (8 pixels) needleleaf forest (9 pixels)
No differences between types, may be due to mixed pixels
Walker Branch•Pixels with LAI and PSN•All pixels in 5x5km area• MODIS landcover: broadleaf crops (8 pixels) broadleaf forest (8 pixels) needleleaf forest (9 pixels)
No differences between types, may be due to mixed pixels
Lack of Heterogeneity
in MODIS pixels near tower
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99 ORNL DAAC ORNL DAAC
MODIS Products- Walker Branch
PSN
fPAR
LAIEVI
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1010 ORNL DAAC ORNL DAAC
MODIS Products - Harvard Forest
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WB Flux 1995-98
Lotec NEP 2000-01
MODIS PSN 2001
Lotec / MODIS
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WB Flux 1995-98
BGC NEP 2000-01
MODIS PSN 2001
BGC / MODIS
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HF Flux 1992-99
MODIS PSN 2001
Lotec NEP 2000-2001
Lotec / MODIS
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HF Flux 1992-99
MODIS PSN 2001
BGC NEP 2000-2001
BGC / MODIS
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1717 ORNL DAAC ORNL DAAC
Measured Relative LAI - WB
Time to 50% LAIMax as Function of
Average Spring Temp.
Time to 50% LAIMax as Function of
Degree GrowingDays
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UMBS, ISIN, good pixels in 3x3 km area: LAI, fPAR, EVI, PSN
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Metolius, ISIN, good pixels in 3x3 km area: LAI, fPAR, EVI, PSN
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2121 ORNL DAAC ORNL DAAC
Comparison of Flux-Model-MODIS
Walker Branch– MODIS LAI compares favorably to 10-yrs LAI field
measurements– Springtime pattern is about the same
° Lotec is later
° MODIS PSN is earlier
– Lotec model NEP is about half measured NEE
Harvard Forest– Springtime pattern is about the same
° Lotec is later
° MODIS PSN is earlier
– Lotec model NEP is about same as measured NEE